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From GitBox <...@apache.org>
Subject [GitHub] StephanEwen closed pull request #6726: [FLINK-9061] [s3] Add entropy injection to S3 file systems for checkpoints
Date Tue, 25 Sep 2018 07:27:27 GMT
StephanEwen closed pull request #6726: [FLINK-9061] [s3] Add entropy injection to S3 file systems for checkpoints
URL: https://github.com/apache/flink/pull/6726
 
 
   

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diff --git a/docs/ops/filesystems.md b/docs/ops/filesystems.md
index dab38176493..416302e49ca 100644
--- a/docs/ops/filesystems.md
+++ b/docs/ops/filesystems.md
@@ -24,7 +24,7 @@ under the License.
 
 This page provides details on setting up and configuring distributed file systems for use with Flink.
 
-## Flink' File System support
+## Flink's File System support
 
 Flink uses file systems both as a source and sink in streaming/batch applications, and as a target for checkpointing.
 These file systems can for example be *Unix/Windows file systems*, *HDFS*, or even object stores like *S3*.
@@ -43,12 +43,19 @@ Flink directly implements the following file systems:
   - **local**: This file system is used when the scheme is *"file://"*, and it represents the file system of the local machine, 
 including any NFS or SAN that is mounted into that local file system.
 
-  - **S3**: Flink directly provides file systems to talk to Amazon S3, registered under the scheme *"s3://"*.
-There are two alternative implementations, `flink-s3-fs-presto` and `flink-s3-fs-hadoop`, based on code from the [Presto project](https://prestodb.io/)
-and the [Hadoop Project](https://hadoop.apache.org/). Both implementations are self-contained with no dependency footprint.
-To use those when using Flink as a library, add the respective maven dependency (`org.apache.flink:flink-s3-fs-presto:{{ site.version }}` or `org.apache.flink:flink-s3-fs-hadoop:{{ site.version }}`).
-When starting a Flink application from the Flink binaries, copy or move the respective jar file from the `opt` folder to the `lib` folder.
-See [AWS setup](deployment/aws.html) for details.
+  - **S3**: Flink directly provides file systems to talk to Amazon S3. There are two alternative implementations, `flink-s3-fs-presto`
+    and `flink-s3-fs-hadoop`. Both implementations are self-contained with no dependency footprint, there is no need to add Hadoop to
+    the classpath to use them. Both internally use some Hadoop code, but "shade away" all classes to avoid any dependency conflicts.
+
+    - `flink-s3-fs-presto`, registered under the scheme *"s3://"*, is based on code from the [Presto project](https://prestodb.io/).
+      You can configure it the same way you can [configure the Presto file system](https://prestodb.io/docs/0.185/connector/hive.html#amazon-s3-configuration).
+      
+    - `flink-s3-fs-hadoop`, registered under *"s3://"* and *"s3a://"*, based on code from the [Hadoop Project](https://hadoop.apache.org/).
+      The file system can be [configured exactly like Hadoop's s3a](https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/index.html#S3A).
+
+    To use those file systems when using Flink as a library, add the respective maven dependency (`org.apache.flink:flink-s3-fs-presto:{{ site.version }}`
+    or `org.apache.flink:flink-s3-fs-hadoop:{{ site.version }}`). When starting a Flink application from the Flink binaries, copy or move
+    the respective jar file from the `opt` folder to the `lib` folder. See also [AWS setup](deployment/aws.html) for additional details.
 
   - **MapR FS**: The MapR file system *"maprfs://"* is automatically available when the MapR libraries are in the classpath.
   
@@ -59,8 +66,8 @@ See [AWS setup](deployment/aws.html) for details.
 
 ### HDFS and Hadoop File System support 
 
-For a scheme where Flink does not implemented a file system itself, Flink will try to use Hadoop to instantiate a file system for the respective scheme.
-All Hadoop file systems are automatically available once `flink-runtime` and the relevant Hadoop libraries are in classpath.
+For all schemes where Flink cannot find a directly supported file system, Flink will try to use Hadoop to instantiate a file system for the respective scheme.
+All Hadoop file systems are automatically available once `flink-runtime` and the Hadoop libraries are in classpath.
 
 That way, Flink seamlessly supports all of Hadoop file systems, and all Hadoop-compatible file systems (HCFS), for example:
 
@@ -115,6 +122,33 @@ These limits are enforced per TaskManager, so each TaskManager in a Flink applic
 In addition, the limits are also only enforced per FileSystem instance. Because File Systems are created per scheme and authority, different
 authorities will have their own connection pool. For example `hdfs://myhdfs:50010/` and `hdfs://anotherhdfs:4399/` will have separate pools.
 
+## Entropy injection for S3 file systems
+
+The bundled S3 file systems (`flink-s3-fs-presto` and `flink-s3-fs-hadoop`) support entropy injection. Entropy injection is
+a technique to improve scalability of AWS S3 buckets through adding some random characters near the beginning of the key.
+
+If entropy injection is activated, a configured substring in the paths will be replaced by random characters. For example, path
+`s3://my-bucket/checkpoints/_entropy_/dashboard-job/` would be replaced by something like `s3://my-bucket/checkpoints/gf36ikvg/dashboard-job/`.
+
+**Note that this only happens when the file creation passes the option to inject entropy!**, otherwise the file path will
+simply remove the entropy key substring. See
+[FileSystem.create(Path, WriteOption)](https://ci.apache.org/projects/flink/flink-docs-release-1.6/api/java/org/apache/flink/core/fs/FileSystem.html#create-org.apache.flink.core.fs.Path-org.apache.flink.core.fs.FileSystem.WriteOptions-)
+for details.
+
+*Note: The Flink runtime currently passes the option to inject entropy only to checkpoint data files.*
+*All other files, including checkpoint metadata and external URI do not inject entropy, to keep checkpoint URIs predictable.*
+
+To enable entropy injection, configure the *entropy key* and the *entropy length* parameters.
+
+```
+s3.entropy.key: _entropy_
+s3.entropy.length: 4 (default)
+
+```
+
+The `s3.entropy.key` defines the string in paths that is replaced by the random characters. Paths that do not contain the entropy key are left unchanged.
+If a file system operation does not pass the *"inject entropy"* write option, the entropy key substring is simply removed.
+The `s3.entropy.length` defined the number of random alphanumeric characters to replace the entropy key with.
 
 ## Adding new File System Implementations
 
diff --git a/flink-core/src/main/java/org/apache/flink/core/fs/FileSystem.java b/flink-core/src/main/java/org/apache/flink/core/fs/FileSystem.java
index d451109ddba..ba2113ae616 100644
--- a/flink-core/src/main/java/org/apache/flink/core/fs/FileSystem.java
+++ b/flink-core/src/main/java/org/apache/flink/core/fs/FileSystem.java
@@ -576,29 +576,8 @@ public boolean exists(final Path f) throws IOException {
 	/**
 	 * Opens an FSDataOutputStream at the indicated Path.
 	 *
-	 * <p>This method is deprecated, because most of its parameters are ignored by most file systems.
-	 * To control for example the replication factor and block size in the Hadoop Distributed File system,
-	 * make sure that the respective Hadoop configuration file is either linked from the Flink configuration,
-	 * or in the classpath of either Flink or the user code.
-	 *
-	 * @param f
-	 *        the file name to open
-	 * @param overwrite
-	 *        if a file with this name already exists, then if true,
-	 *        the file will be overwritten, and if false an error will be thrown.
-	 * @param bufferSize
-	 *        the size of the buffer to be used.
-	 * @param replication
-	 *        required block replication for the file.
-	 * @param blockSize
-	 *        the size of the file blocks
-	 *
-	 * @throws IOException Thrown, if the stream could not be opened because of an I/O, or because
-	 *                     a file already exists at that path and the write mode indicates to not
-	 *                     overwrite the file.
-	 *
-	 * @deprecated Deprecated because not well supported across types of file systems.
-	 *             Control the behavior of specific file systems via configurations instead.
+	 * @deprecated Deprecated in favor of {@link #create(Path, WriteOptions)} which offers better extensibility
+	 *             to options that are supported only by some filesystems implementations.
 	 */
 	@Deprecated
 	public FSDataOutputStream create(
@@ -648,6 +627,25 @@ public FSDataOutputStream create(Path f, boolean overwrite) throws IOException {
 	 */
 	public abstract FSDataOutputStream create(Path f, WriteMode overwriteMode) throws IOException;
 
+	/**
+	 * Creates a new file at the given path and opens an FSDataOutputStream to that new file.
+	 *
+	 * <p>This method takes various options, some of which are not supported by all file systems
+	 * (such as controlling block size).
+	 *
+	 * <p>Implementation note: This method should be abstract, but is currently not in order to not break
+	 * backwards compatibility of this class with earlier Flink versions.
+	 *
+	 * @param f The path for the new file.
+	 * @param options The options to parametrize the file and stream creation.
+	 * @return The stream to the new file at the target path.
+	 *
+	 * @throws IOException Thrown if an error occurs while creating the file or opening the stream.
+	 */
+	public FSDataOutputStream create(Path f, WriteOptions options) throws IOException {
+		return create(f, options.getOverwrite());
+	}
+
 	/**
 	 * Renames the file/directory src to dst.
 	 *
diff --git a/flink-core/src/main/java/org/apache/flink/core/fs/WriteOptions.java b/flink-core/src/main/java/org/apache/flink/core/fs/WriteOptions.java
new file mode 100644
index 00000000000..70f4973dc14
--- /dev/null
+++ b/flink-core/src/main/java/org/apache/flink/core/fs/WriteOptions.java
@@ -0,0 +1,144 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.core.fs;
+
+import org.apache.flink.annotation.Public;
+import org.apache.flink.core.fs.FileSystem.WriteMode;
+
+import javax.annotation.Nullable;
+
+import static org.apache.flink.util.Preconditions.checkArgument;
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * Write options that can be passed to the methods that write files.
+ */
+@Public
+public class WriteOptions {
+
+	private WriteMode overwrite = WriteMode.NO_OVERWRITE;
+
+	@Nullable
+	private BlockOptions blockSettings;
+
+	private boolean injectEntropy;
+
+	// ------------------------------------------------------------------------
+	//  getters & setters
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Gets the overwrite option.
+	 */
+	public WriteMode getOverwrite() {
+		return overwrite;
+	}
+
+	/**
+	 * Sets the overwrite option.
+	 *
+	 * <p>Method returns this object for fluent function call chaining.
+	 */
+	public WriteOptions setOverwrite(WriteMode overwrite) {
+		this.overwrite = checkNotNull(overwrite);
+		return this;
+	}
+
+	/**
+	 * Gets the block writing settings, like size and replication factor.
+	 * Returns null if no settings are defined.
+	 */
+	@Nullable
+	public BlockOptions getBlockSettings() {
+		return blockSettings;
+	}
+
+	/**
+	 * Sets the block settings, for file systems working with block replication and
+	 * exposing those settings
+	 *
+	 * <p>Method returns this object for fluent function call chaining.
+	 */
+	public WriteOptions setBlockSettings(@Nullable BlockOptions blockSettings) {
+		this.blockSettings = blockSettings;
+		return this;
+	}
+
+	/**
+	 * Gets whether to inject entropy into the path.
+	 */
+	public boolean isInjectEntropy() {
+		return injectEntropy;
+	}
+
+	/**
+	 * Sets whether to inject entropy into the path.
+	 *
+	 * <p>Entropy injection is only supported select filesystems like S3 to overcome
+	 * scalability issues in the sharding. For this option to have any effect, the
+	 * file system must be configured to replace an entropy key with entropy, and the
+	 * path that is written to must contain the entropy key.
+	 *
+	 * <p>Method returns this object for fluent function call chaining.
+	 */
+	public WriteOptions setInjectEntropy(boolean injectEntropy) {
+		this.injectEntropy = injectEntropy;
+		return this;
+	}
+
+	// ------------------------------------------------------------------------
+	//  nested options classes
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Settings for block replication. Interpreted only by filesystems that are based
+	 * expose block replication settings.
+	 */
+	@Public
+	public static class BlockOptions {
+
+		/** The size of the blocks, in bytes. */
+		private long blockSize;
+
+		/** The number of times the block should be replicated. */
+		private int replicationFactor;
+
+		public BlockOptions(long blockSize, int replicationFactor) {
+			checkArgument(blockSize > 0, "blockSize must be >0");
+			checkArgument(replicationFactor > 0, "replicationFactor must be >=1");
+
+			this.blockSize = blockSize;
+			this.replicationFactor = replicationFactor;
+		}
+
+		/**
+		 * Gets the block size, in bytes.
+		 */
+		public long getBlockSize() {
+			return blockSize;
+		}
+
+		/**
+		 * Gets the number of times the block should be replicated.
+		 */
+		public int getReplicationFactor() {
+			return replicationFactor;
+		}
+	}
+}
diff --git a/flink-core/src/main/java/org/apache/flink/util/StringUtils.java b/flink-core/src/main/java/org/apache/flink/util/StringUtils.java
index b9ff319f7b3..aeb49cc0076 100644
--- a/flink-core/src/main/java/org/apache/flink/util/StringUtils.java
+++ b/flink-core/src/main/java/org/apache/flink/util/StringUtils.java
@@ -32,6 +32,7 @@
 import java.util.Random;
 import java.util.stream.Collectors;
 
+import static org.apache.flink.util.Preconditions.checkArgument;
 import static org.apache.flink.util.Preconditions.checkNotNull;
 
 /**
@@ -248,6 +249,37 @@ public static String getRandomString(Random rnd, int minLength, int maxLength, c
 		return new String(data);
 	}
 
+	/**
+	 * Appends a random alphanumeric string of given length to the given string buffer.
+	 *
+	 * @param rnd The random number generator to use.
+	 * @param buffer The buffer to append to.
+	 * @param length The number of alphanumeric characters to append.
+	 */
+	public static void appendRandomAlphanumericString(Random rnd, StringBuilder buffer, int length) {
+		checkNotNull(rnd);
+		checkArgument(length >= 0);
+
+		for (int i = 0; i < length; i++) {
+			buffer.append(nextAlphanumericChar(rnd));
+		}
+	}
+
+	private static char nextAlphanumericChar(Random rnd) {
+		int which = rnd.nextInt(62);
+		char c;
+		if (which < 10) {
+			c = (char) ('0' + which);
+		}
+		else if (which < 36) {
+			c = (char) ('A' - 10 + which);
+		}
+		else {
+			c = (char) ('a' - 36 + which);
+		}
+		return c;
+	}
+
 	/**
 	 * Writes a String to the given output.
 	 * The written string can be read with {@link #readString(DataInputView)}.
diff --git a/flink-core/src/test/java/org/apache/flink/util/StringUtilsTest.java b/flink-core/src/test/java/org/apache/flink/util/StringUtilsTest.java
index 5f705b4c834..1c9abf28eb8 100644
--- a/flink-core/src/test/java/org/apache/flink/util/StringUtilsTest.java
+++ b/flink-core/src/test/java/org/apache/flink/util/StringUtilsTest.java
@@ -20,8 +20,11 @@
 
 import org.junit.Test;
 
+import java.util.Random;
+
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
 
 /**
  * Tests for the {@link StringUtils}.
@@ -56,4 +59,15 @@ public void testHexArrayToString() {
 		String hex = StringUtils.byteToHexString(byteArray);
 		assertEquals("019f314a", hex);
 	}
+
+	@Test
+	public void testAppendAlphanumeric() {
+		StringBuilder bld = new StringBuilder();
+		StringUtils.appendRandomAlphanumericString(new Random(), bld, 256);
+		String str = bld.toString();
+
+		if (!str.matches("[a-zA-Z0-9]+")) {
+			fail("Not alphanumeric: " + str);
+		}
+	}
 }
diff --git a/flink-filesystems/flink-fs-hadoop-shaded/src/main/java/org/apache/hadoop/conf/Configuration.java b/flink-filesystems/flink-fs-hadoop-shaded/src/main/java/org/apache/hadoop/conf/Configuration.java
index 49c81efd23e..7b1179ebc76 100644
--- a/flink-filesystems/flink-fs-hadoop-shaded/src/main/java/org/apache/hadoop/conf/Configuration.java
+++ b/flink-filesystems/flink-fs-hadoop-shaded/src/main/java/org/apache/hadoop/conf/Configuration.java
@@ -657,21 +657,7 @@ private void handleDeprecation() {
 	static {
 		// Add default resources
 		addDefaultResource("core-default-shaded.xml");
-		addDefaultResource("core-site.xml");
-
-		// print deprecation warning if hadoop-site.xml is found in classpath
-		ClassLoader cL = Thread.currentThread().getContextClassLoader();
-		if (cL == null) {
-			cL = Configuration.class.getClassLoader();
-		}
-		if (cL.getResource("hadoop-site.xml") != null) {
-			LOG.warn("DEPRECATED: hadoop-site.xml found in the classpath. " +
-					"Usage of hadoop-site.xml is deprecated. Instead use core-site.xml, "
-					+ "mapred-site.xml and hdfs-site.xml to override properties of " +
-					"core-default.xml, mapred-default.xml and hdfs-default.xml " +
-					"respectively");
-			addDefaultResource("hadoop-site.xml");
-		}
+		addDefaultResource("core-default-testing.xml");
 	}
 
 	private Properties properties;
diff --git a/flink-filesystems/flink-fs-hadoop-shaded/src/test/resources/core-default-testing.xml b/flink-filesystems/flink-fs-hadoop-shaded/src/test/resources/core-default-testing.xml
new file mode 100644
index 00000000000..0283de79cf1
--- /dev/null
+++ b/flink-filesystems/flink-fs-hadoop-shaded/src/test/resources/core-default-testing.xml
@@ -0,0 +1,2775 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
+
+<!--
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+<!-- Do not modify this file directly.  Instead, copy entries that you -->
+<!-- wish to modify from this file into core-site.xml and change them -->
+<!-- there.  If core-site.xml does not already exist, create it.      -->
+
+<configuration>
+
+  <!--- global properties -->
+
+  <property>
+    <name>hadoop.common.configuration.version</name>
+    <value>3.0.0</value>
+    <description>version of this configuration file</description>
+  </property>
+
+  <property>
+    <name>hadoop.tmp.dir</name>
+    <value>/tmp/hadoop-${user.name}</value>
+    <description>A base for other temporary directories.</description>
+  </property>
+
+  <property>
+    <name>hadoop.http.filter.initializers</name>
+    <value>org.apache.hadoop.http.lib.StaticUserWebFilter</value>
+    <description>A comma separated list of class names. Each class in the list
+      must extend org.apache.hadoop.http.FilterInitializer. The corresponding
+      Filter will be initialized. Then, the Filter will be applied to all user
+      facing jsp and servlet web pages.  The ordering of the list defines the
+      ordering of the filters.</description>
+  </property>
+
+  <!--- security properties -->
+
+  <property>
+    <name>hadoop.security.authorization</name>
+    <value>false</value>
+    <description>Is service-level authorization enabled?</description>
+  </property>
+
+  <property>
+    <name>hadoop.security.instrumentation.requires.admin</name>
+    <value>false</value>
+    <description>
+      Indicates if administrator ACLs are required to access
+      instrumentation servlets (JMX, METRICS, CONF, STACKS).
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.authentication</name>
+    <value>simple</value>
+    <description>Possible values are simple (no authentication), and kerberos
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping</name>
+    <value>org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback</value>
+    <description>
+      Class for user to group mapping (get groups for a given user) for ACL.
+      The default implementation,
+      org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback,
+      will determine if the Java Native Interface (JNI) is available. If JNI is
+      available the implementation will use the API within hadoop to resolve a
+      list of groups for a user. If JNI is not available then the shell
+      implementation, ShellBasedUnixGroupsMapping, is used.  This implementation
+      shells out to the Linux/Unix environment with the
+      <code>bash -c groups</code> command to resolve a list of groups for a user.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.dns.interface</name>
+    <description>
+      The name of the Network Interface from which the service should determine
+      its host name for Kerberos login. e.g. eth2. In a multi-homed environment,
+      the setting can be used to affect the _HOST substitution in the service
+      Kerberos principal. If this configuration value is not set, the service
+      will use its default hostname as returned by
+      InetAddress.getLocalHost().getCanonicalHostName().
+
+      Most clusters will not require this setting.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.dns.nameserver</name>
+    <description>
+      The host name or IP address of the name server (DNS) which a service Node
+      should use to determine its own host name for Kerberos Login. Requires
+      hadoop.security.dns.interface.
+
+      Most clusters will not require this setting.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.dns.log-slow-lookups.enabled</name>
+    <value>false</value>
+    <description>
+      Time name lookups (via SecurityUtil) and log them if they exceed the
+      configured threshold.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.dns.log-slow-lookups.threshold.ms</name>
+    <value>1000</value>
+    <description>
+      If slow lookup logging is enabled, this threshold is used to decide if a
+      lookup is considered slow enough to be logged.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.groups.cache.secs</name>
+    <value>300</value>
+    <description>
+      This is the config controlling the validity of the entries in the cache
+      containing the user->group mapping. When this duration has expired,
+      then the implementation of the group mapping provider is invoked to get
+      the groups of the user and then cached back.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.groups.negative-cache.secs</name>
+    <value>30</value>
+    <description>
+      Expiration time for entries in the the negative user-to-group mapping
+      caching, in seconds. This is useful when invalid users are retrying
+      frequently. It is suggested to set a small value for this expiration, since
+      a transient error in group lookup could temporarily lock out a legitimate
+      user.
+
+      Set this to zero or negative value to disable negative user-to-group caching.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.groups.cache.warn.after.ms</name>
+    <value>5000</value>
+    <description>
+      If looking up a single user to group takes longer than this amount of
+      milliseconds, we will log a warning message.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.groups.cache.background.reload</name>
+    <value>false</value>
+    <description>
+      Whether to reload expired user->group mappings using a background thread
+      pool. If set to true, a pool of
+      hadoop.security.groups.cache.background.reload.threads is created to
+      update the cache in the background.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.groups.cache.background.reload.threads</name>
+    <value>3</value>
+    <description>
+      Only relevant if hadoop.security.groups.cache.background.reload is true.
+      Controls the number of concurrent background user->group cache entry
+      refreshes. Pending refresh requests beyond this value are queued and
+      processed when a thread is free.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.groups.shell.command.timeout</name>
+    <value>0s</value>
+    <description>
+      Used by the ShellBasedUnixGroupsMapping class, this property controls how
+      long to wait for the underlying shell command that is run to fetch groups.
+      Expressed in seconds (e.g. 10s, 1m, etc.), if the running command takes
+      longer than the value configured, the command is aborted and the groups
+      resolver would return a result of no groups found. A value of 0s (default)
+      would mean an infinite wait (i.e. wait until the command exits on its own).
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.connection.timeout.ms</name>
+    <value>60000</value>
+    <description>
+      This property is the connection timeout (in milliseconds) for LDAP
+      operations. If the LDAP provider doesn't establish a connection within the
+      specified period, it will abort the connect attempt. Non-positive value
+      means no LDAP connection timeout is specified in which case it waits for the
+      connection to establish until the underlying network times out.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.read.timeout.ms</name>
+    <value>60000</value>
+    <description>
+      This property is the read timeout (in milliseconds) for LDAP
+      operations. If the LDAP provider doesn't get a LDAP response within the
+      specified period, it will abort the read attempt. Non-positive value
+      means no read timeout is specified in which case it waits for the response
+      infinitely.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.url</name>
+    <value></value>
+    <description>
+      The URL of the LDAP server to use for resolving user groups when using
+      the LdapGroupsMapping user to group mapping.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.ssl</name>
+    <value>false</value>
+    <description>
+      Whether or not to use SSL when connecting to the LDAP server.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.ssl.keystore</name>
+    <value></value>
+    <description>
+      File path to the SSL keystore that contains the SSL certificate required
+      by the LDAP server.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.ssl.keystore.password.file</name>
+    <value></value>
+    <description>
+      The path to a file containing the password of the LDAP SSL keystore. If
+      the password is not configured in credential providers and the property
+      hadoop.security.group.mapping.ldap.ssl.keystore.password is not set,
+      LDAPGroupsMapping reads password from the file.
+
+      IMPORTANT: This file should be readable only by the Unix user running
+      the daemons and should be a local file.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.ssl.keystore.password</name>
+    <value></value>
+    <description>
+      The password of the LDAP SSL keystore. this property name is used as an
+      alias to get the password from credential providers. If the password can
+      not be found and hadoop.security.credential.clear-text-fallback is true
+      LDAPGroupsMapping uses the value of this property for password.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.credential.clear-text-fallback</name>
+    <value>true</value>
+    <description>
+      true or false to indicate whether or not to fall back to storing credential
+      password as clear text. The default value is true. This property only works
+      when the password can't not be found from credential providers.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.credential.provider.path</name>
+    <value></value>
+    <description>
+      A comma-separated list of URLs that indicates the type and
+      location of a list of providers that should be consulted.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.credstore.java-keystore-provider.password-file</name>
+    <value></value>
+    <description>
+      The path to a file containing the custom password for all keystores
+      that may be configured in the provider path.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.bind.user</name>
+    <value></value>
+    <description>
+      The distinguished name of the user to bind as when connecting to the LDAP
+      server. This may be left blank if the LDAP server supports anonymous binds.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.bind.password.file</name>
+    <value></value>
+    <description>
+      The path to a file containing the password of the bind user. If
+      the password is not configured in credential providers and the property
+      hadoop.security.group.mapping.ldap.bind.password is not set,
+      LDAPGroupsMapping reads password from the file.
+
+      IMPORTANT: This file should be readable only by the Unix user running
+      the daemons and should be a local file.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.bind.password</name>
+    <value></value>
+    <description>
+      The password of the bind user. this property name is used as an
+      alias to get the password from credential providers. If the password can
+      not be found and hadoop.security.credential.clear-text-fallback is true
+      LDAPGroupsMapping uses the value of this property for password.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.base</name>
+    <value></value>
+    <description>
+      The search base for the LDAP connection. This is a distinguished name,
+      and will typically be the root of the LDAP directory.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.userbase</name>
+    <value></value>
+    <description>
+      The search base for the LDAP connection for user search query. This is a
+      distinguished name, and its the root of the LDAP directory for users.
+      If not set, hadoop.security.group.mapping.ldap.base is used.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.groupbase</name>
+    <value></value>
+    <description>
+      The search base for the LDAP connection for group search . This is a
+      distinguished name, and its the root of the LDAP directory for groups.
+      If not set, hadoop.security.group.mapping.ldap.base is used.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.search.filter.user</name>
+    <value>(&amp;(objectClass=user)(sAMAccountName={0}))</value>
+    <description>
+      An additional filter to use when searching for LDAP users. The default will
+      usually be appropriate for Active Directory installations. If connecting to
+      an LDAP server with a non-AD schema, this should be replaced with
+      (&amp;(objectClass=inetOrgPerson)(uid={0}). {0} is a special string used to
+      denote where the username fits into the filter.
+
+      If the LDAP server supports posixGroups, Hadoop can enable the feature by
+      setting the value of this property to "posixAccount" and the value of
+      the hadoop.security.group.mapping.ldap.search.filter.group property to
+      "posixGroup".
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.search.filter.group</name>
+    <value>(objectClass=group)</value>
+    <description>
+      An additional filter to use when searching for LDAP groups. This should be
+      changed when resolving groups against a non-Active Directory installation.
+
+      See the description of hadoop.security.group.mapping.ldap.search.filter.user
+      to enable posixGroups support.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.search.attr.memberof</name>
+    <value></value>
+    <description>
+      The attribute of the user object that identifies its group objects. By
+      default, Hadoop makes two LDAP queries per user if this value is empty. If
+      set, Hadoop will attempt to resolve group names from this attribute,
+      instead of making the second LDAP query to get group objects. The value
+      should be 'memberOf' for an MS AD installation.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.search.attr.member</name>
+    <value>member</value>
+    <description>
+      The attribute of the group object that identifies the users that are
+      members of the group. The default will usually be appropriate for
+      any LDAP installation.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.search.attr.group.name</name>
+    <value>cn</value>
+    <description>
+      The attribute of the group object that identifies the group name. The
+      default will usually be appropriate for all LDAP systems.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.search.group.hierarchy.levels</name>
+    <value>0</value>
+    <description>
+      The number of levels to go up the group hierarchy when determining
+      which groups a user is part of. 0 Will represent checking just the
+      group that the user belongs to.  Each additional level will raise the
+      time it takes to execute a query by at most
+      hadoop.security.group.mapping.ldap.directory.search.timeout.
+      The default will usually be appropriate for all LDAP systems.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.posix.attr.uid.name</name>
+    <value>uidNumber</value>
+    <description>
+      The attribute of posixAccount to use when groups for membership.
+      Mostly useful for schemas wherein groups have memberUids that use an
+      attribute other than uidNumber.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.posix.attr.gid.name</name>
+    <value>gidNumber</value>
+    <description>
+      The attribute of posixAccount indicating the group id.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.ldap.directory.search.timeout</name>
+    <value>10000</value>
+    <description>
+      The attribute applied to the LDAP SearchControl properties to set a
+      maximum time limit when searching and awaiting a result.
+      Set to 0 if infinite wait period is desired.
+      Default is 10 seconds. Units in milliseconds.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.providers</name>
+    <value></value>
+    <description>
+      Comma separated of names of other providers to provide user to group
+      mapping. Used by CompositeGroupsMapping.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.group.mapping.providers.combined</name>
+    <value>true</value>
+    <description>
+      true or false to indicate whether groups from the providers are combined or
+      not. The default value is true. If true, then all the providers will be
+      tried to get groups and all the groups are combined to return as the final
+      results. Otherwise, providers are tried one by one in the configured list
+      order, and if any groups are retrieved from any provider, then the groups
+      will be returned without trying the left ones.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.service.user.name.key</name>
+    <value></value>
+    <description>
+      For those cases where the same RPC protocol is implemented by multiple
+      servers, this configuration is required for specifying the principal
+      name to use for the service when the client wishes to make an RPC call.
+    </description>
+  </property>
+  <property>
+    <name>fs.azure.user.agent.prefix</name>
+    <value>unknown</value>
+    <description>
+      WASB passes User-Agent header to the Azure back-end. The default value
+      contains WASB version, Java Runtime version, Azure Client library version,
+      and the value of the configuration option fs.azure.user.agent.prefix.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.uid.cache.secs</name>
+    <value>14400</value>
+    <description>
+      This is the config controlling the validity of the entries in the cache
+      containing the userId to userName and groupId to groupName used by
+      NativeIO getFstat().
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.rpc.protection</name>
+    <value>authentication</value>
+    <description>A comma-separated list of protection values for secured sasl
+      connections. Possible values are authentication, integrity and privacy.
+      authentication means authentication only and no integrity or privacy;
+      integrity implies authentication and integrity are enabled; and privacy
+      implies all of authentication, integrity and privacy are enabled.
+      hadoop.security.saslproperties.resolver.class can be used to override
+      the hadoop.rpc.protection for a connection at the server side.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.saslproperties.resolver.class</name>
+    <value></value>
+    <description>SaslPropertiesResolver used to resolve the QOP used for a
+      connection. If not specified, the full set of values specified in
+      hadoop.rpc.protection is used while determining the QOP used for the
+      connection. If a class is specified, then the QOP values returned by
+      the class will be used while determining the QOP used for the connection.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.sensitive-config-keys</name>
+    <value>
+      secret$
+      password$
+      ssl.keystore.pass$
+      fs.s3.*[Ss]ecret.?[Kk]ey
+      fs.s3a.*.server-side-encryption.key
+      fs.azure.account.key.*
+      credential$
+      oauth.*token$
+      hadoop.security.sensitive-config-keys
+    </value>
+    <description>A comma-separated or multi-line list of regular expressions to
+      match configuration keys that should be redacted where appropriate, for
+      example, when logging modified properties during a reconfiguration,
+      private credentials should not be logged.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.workaround.non.threadsafe.getpwuid</name>
+    <value>true</value>
+    <description>Some operating systems or authentication modules are known to
+      have broken implementations of getpwuid_r and getpwgid_r, such that these
+      calls are not thread-safe. Symptoms of this problem include JVM crashes
+      with a stack trace inside these functions. If your system exhibits this
+      issue, enable this configuration parameter to include a lock around the
+      calls as a workaround.
+
+      An incomplete list of some systems known to have this issue is available
+      at http://wiki.apache.org/hadoop/KnownBrokenPwuidImplementations
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.kerberos.kinit.command</name>
+    <value>kinit</value>
+    <description>Used to periodically renew Kerberos credentials when provided
+      to Hadoop. The default setting assumes that kinit is in the PATH of users
+      running the Hadoop client. Change this to the absolute path to kinit if this
+      is not the case.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.kerberos.min.seconds.before.relogin</name>
+    <value>60</value>
+    <description>The minimum time between relogin attempts for Kerberos, in
+      seconds.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.auth_to_local</name>
+    <value></value>
+    <description>Maps kerberos principals to local user names</description>
+  </property>
+
+  <property>
+    <name>hadoop.token.files</name>
+    <value></value>
+    <description>List of token cache files that have delegation tokens for hadoop service</description>
+  </property>
+
+  <!-- i/o properties -->
+  <property>
+    <name>io.file.buffer.size</name>
+    <value>4096</value>
+    <description>The size of buffer for use in sequence files.
+      The size of this buffer should probably be a multiple of hardware
+      page size (4096 on Intel x86), and it determines how much data is
+      buffered during read and write operations.</description>
+  </property>
+
+  <property>
+    <name>io.bytes.per.checksum</name>
+    <value>512</value>
+    <description>The number of bytes per checksum.  Must not be larger than
+      io.file.buffer.size.</description>
+  </property>
+
+  <property>
+    <name>io.skip.checksum.errors</name>
+    <value>false</value>
+    <description>If true, when a checksum error is encountered while
+      reading a sequence file, entries are skipped, instead of throwing an
+      exception.</description>
+  </property>
+
+  <property>
+    <name>io.compression.codecs</name>
+    <value></value>
+    <description>A comma-separated list of the compression codec classes that can
+      be used for compression/decompression. In addition to any classes specified
+      with this property (which take precedence), codec classes on the classpath
+      are discovered using a Java ServiceLoader.</description>
+  </property>
+
+  <property>
+    <name>io.compression.codec.bzip2.library</name>
+    <value>system-native</value>
+    <description>The native-code library to be used for compression and
+      decompression by the bzip2 codec.  This library could be specified
+      either by by name or the full pathname.  In the former case, the
+      library is located by the dynamic linker, usually searching the
+      directories specified in the environment variable LD_LIBRARY_PATH.
+
+      The value of "system-native" indicates that the default system
+      library should be used.  To indicate that the algorithm should
+      operate entirely in Java, specify "java-builtin".</description>
+  </property>
+
+  <property>
+    <name>io.serializations</name>
+    <value>org.apache.hadoop.io.serializer.WritableSerialization, org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization, org.apache.hadoop.io.serializer.avro.AvroReflectSerialization</value>
+    <description>A list of serialization classes that can be used for
+      obtaining serializers and deserializers.</description>
+  </property>
+
+  <property>
+    <name>io.seqfile.local.dir</name>
+    <value>${hadoop.tmp.dir}/io/local</value>
+    <description>The local directory where sequence file stores intermediate
+      data files during merge.  May be a comma-separated list of
+      directories on different devices in order to spread disk i/o.
+      Directories that do not exist are ignored.
+    </description>
+  </property>
+
+  <property>
+    <name>io.map.index.skip</name>
+    <value>0</value>
+    <description>Number of index entries to skip between each entry.
+      Zero by default. Setting this to values larger than zero can
+      facilitate opening large MapFiles using less memory.</description>
+  </property>
+
+  <property>
+    <name>io.map.index.interval</name>
+    <value>128</value>
+    <description>
+      MapFile consist of two files - data file (tuples) and index file
+      (keys). For every io.map.index.interval records written in the
+      data file, an entry (record-key, data-file-position) is written
+      in the index file. This is to allow for doing binary search later
+      within the index file to look up records by their keys and get their
+      closest positions in the data file.
+    </description>
+  </property>
+
+  <property>
+    <name>io.erasurecode.codec.rs.rawcoders</name>
+    <value>rs_native,rs_java</value>
+    <description>
+      Comma separated raw coder implementations for the rs codec. The earlier
+      factory is prior to followings in case of failure of creating raw coders.
+    </description>
+  </property>
+
+  <property>
+    <name>io.erasurecode.codec.rs-legacy.rawcoders</name>
+    <value>rs-legacy_java</value>
+    <description>
+      Comma separated raw coder implementations for the rs-legacy codec. The earlier
+      factory is prior to followings in case of failure of creating raw coders.
+    </description>
+  </property>
+
+  <property>
+    <name>io.erasurecode.codec.xor.rawcoders</name>
+    <value>xor_native,xor_java</value>
+    <description>
+      Comma separated raw coder implementations for the xor codec. The earlier
+      factory is prior to followings in case of failure of creating raw coders.
+    </description>
+  </property>
+
+  <!-- file system properties -->
+
+  <property>
+    <name>fs.defaultFS</name>
+    <value>file:///</value>
+    <description>The name of the default file system.  A URI whose
+      scheme and authority determine the FileSystem implementation.  The
+      uri's scheme determines the config property (fs.SCHEME.impl) naming
+      the FileSystem implementation class.  The uri's authority is used to
+      determine the host, port, etc. for a filesystem.</description>
+  </property>
+
+  <property>
+    <name>fs.default.name</name>
+    <value>file:///</value>
+    <description>Deprecated. Use (fs.defaultFS) property
+      instead</description>
+  </property>
+
+  <property>
+    <name>fs.trash.interval</name>
+    <value>0</value>
+    <description>Number of minutes after which the checkpoint
+      gets deleted.  If zero, the trash feature is disabled.
+      This option may be configured both on the server and the
+      client. If trash is disabled server side then the client
+      side configuration is checked. If trash is enabled on the
+      server side then the value configured on the server is
+      used and the client configuration value is ignored.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.trash.checkpoint.interval</name>
+    <value>0</value>
+    <description>Number of minutes between trash checkpoints.
+      Should be smaller or equal to fs.trash.interval. If zero,
+      the value is set to the value of fs.trash.interval.
+      Every time the checkpointer runs it creates a new checkpoint
+      out of current and removes checkpoints created more than
+      fs.trash.interval minutes ago.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.protected.directories</name>
+    <value></value>
+    <description>A comma-separated list of directories which cannot
+      be deleted even by the superuser unless they are empty. This
+      setting can be used to guard important system directories
+      against accidental deletion due to administrator error.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.file.impl</name>
+    <value>org.apache.hadoop.fs.local.LocalFs</value>
+    <description>The AbstractFileSystem for file: uris.</description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.har.impl</name>
+    <value>org.apache.hadoop.fs.HarFs</value>
+    <description>The AbstractFileSystem for har: uris.</description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.hdfs.impl</name>
+    <value>org.apache.hadoop.fs.Hdfs</value>
+    <description>The FileSystem for hdfs: uris.</description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.viewfs.impl</name>
+    <value>org.apache.hadoop.fs.viewfs.ViewFs</value>
+    <description>The AbstractFileSystem for view file system for viewfs: uris
+      (ie client side mount table:).</description>
+  </property>
+
+  <property>
+    <name>fs.viewfs.rename.strategy</name>
+    <value>SAME_MOUNTPOINT</value>
+    <description>Allowed rename strategy to rename between multiple mountpoints.
+      Allowed values are SAME_MOUNTPOINT,SAME_TARGET_URI_ACROSS_MOUNTPOINT and
+      SAME_FILESYSTEM_ACROSS_MOUNTPOINT.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.ftp.impl</name>
+    <value>org.apache.hadoop.fs.ftp.FtpFs</value>
+    <description>The FileSystem for Ftp: uris.</description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.webhdfs.impl</name>
+    <value>org.apache.hadoop.fs.WebHdfs</value>
+    <description>The FileSystem for webhdfs: uris.</description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.swebhdfs.impl</name>
+    <value>org.apache.hadoop.fs.SWebHdfs</value>
+    <description>The FileSystem for swebhdfs: uris.</description>
+  </property>
+
+  <property>
+    <name>fs.ftp.host</name>
+    <value>0.0.0.0</value>
+    <description>FTP filesystem connects to this server</description>
+  </property>
+
+  <property>
+    <name>fs.ftp.host.port</name>
+    <value>21</value>
+    <description>
+      FTP filesystem connects to fs.ftp.host on this port
+    </description>
+  </property>
+
+  <property>
+    <name>fs.ftp.data.connection.mode</name>
+    <value>ACTIVE_LOCAL_DATA_CONNECTION_MODE</value>
+    <description>Set the FTPClient's data connection mode based on configuration.
+      Valid values are ACTIVE_LOCAL_DATA_CONNECTION_MODE,
+      PASSIVE_LOCAL_DATA_CONNECTION_MODE and PASSIVE_REMOTE_DATA_CONNECTION_MODE.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.ftp.transfer.mode</name>
+    <value>BLOCK_TRANSFER_MODE</value>
+    <description>
+      Set FTP's transfer mode based on configuration. Valid values are
+      STREAM_TRANSFER_MODE, BLOCK_TRANSFER_MODE and COMPRESSED_TRANSFER_MODE.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.df.interval</name>
+    <value>60000</value>
+    <description>Disk usage statistics refresh interval in msec.</description>
+  </property>
+
+  <property>
+    <name>fs.du.interval</name>
+    <value>600000</value>
+    <description>File space usage statistics refresh interval in msec.</description>
+  </property>
+
+  <property>
+    <name>fs.swift.impl</name>
+    <value>org.apache.hadoop.fs.swift.snative.SwiftNativeFileSystem</value>
+    <description>The implementation class of the OpenStack Swift Filesystem</description>
+  </property>
+
+  <property>
+    <name>fs.automatic.close</name>
+    <value>true</value>
+    <description>By default, FileSystem instances are automatically closed at program
+      exit using a JVM shutdown hook. Setting this property to false disables this
+      behavior. This is an advanced option that should only be used by server applications
+      requiring a more carefully orchestrated shutdown sequence.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.access.key</name>
+    <description>AWS access key ID used by S3A file system. Omit for IAM role-based or provider-based authentication.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.secret.key</name>
+    <description>AWS secret key used by S3A file system. Omit for IAM role-based or provider-based authentication.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.aws.credentials.provider</name>
+    <description>
+      Comma-separated class names of credential provider classes which implement
+      com.amazonaws.auth.AWSCredentialsProvider.
+
+      These are loaded and queried in sequence for a valid set of credentials.
+      Each listed class must implement one of the following means of
+      construction, which are attempted in order:
+      1. a public constructor accepting java.net.URI and
+      org.apache.hadoop.conf.Configuration,
+      2. a public static method named getInstance that accepts no
+      arguments and returns an instance of
+      com.amazonaws.auth.AWSCredentialsProvider, or
+      3. a public default constructor.
+
+      Specifying org.apache.hadoop.fs.s3a.AnonymousAWSCredentialsProvider allows
+      anonymous access to a publicly accessible S3 bucket without any credentials.
+      Please note that allowing anonymous access to an S3 bucket compromises
+      security and therefore is unsuitable for most use cases. It can be useful
+      for accessing public data sets without requiring AWS credentials.
+
+      If unspecified, then the default list of credential provider classes,
+      queried in sequence, is:
+      1. org.apache.hadoop.fs.s3a.BasicAWSCredentialsProvider: supports static
+      configuration of AWS access key ID and secret access key.  See also
+      fs.s3a.access.key and fs.s3a.secret.key.
+      2. com.amazonaws.auth.EnvironmentVariableCredentialsProvider: supports
+      configuration of AWS access key ID and secret access key in
+      environment variables named AWS_ACCESS_KEY_ID and
+      AWS_SECRET_ACCESS_KEY, as documented in the AWS SDK.
+      3. com.amazonaws.auth.InstanceProfileCredentialsProvider: supports use
+      of instance profile credentials if running in an EC2 VM.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.session.token</name>
+    <description>Session token, when using org.apache.hadoop.fs.s3a.TemporaryAWSCredentialsProvider
+      as one of the providers.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.security.credential.provider.path</name>
+    <value />
+    <description>
+      Optional comma separated list of credential providers, a list
+      which is prepended to that set in hadoop.security.credential.provider.path
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.connection.maximum</name>
+    <value>15</value>
+    <description>Controls the maximum number of simultaneous connections to S3.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.connection.ssl.enabled</name>
+    <value>true</value>
+    <description>Enables or disables SSL connections to S3.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.endpoint</name>
+    <description>AWS S3 endpoint to connect to. An up-to-date list is
+      provided in the AWS Documentation: regions and endpoints. Without this
+      property, the standard region (s3.amazonaws.com) is assumed.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.path.style.access</name>
+    <value>false</value>
+    <description>Enable S3 path style access ie disabling the default virtual hosting behaviour.
+      Useful for S3A-compliant storage providers as it removes the need to set up DNS for virtual hosting.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.proxy.host</name>
+    <description>Hostname of the (optional) proxy server for S3 connections.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.proxy.port</name>
+    <description>Proxy server port. If this property is not set
+      but fs.s3a.proxy.host is, port 80 or 443 is assumed (consistent with
+      the value of fs.s3a.connection.ssl.enabled).</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.proxy.username</name>
+    <description>Username for authenticating with proxy server.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.proxy.password</name>
+    <description>Password for authenticating with proxy server.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.proxy.domain</name>
+    <description>Domain for authenticating with proxy server.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.proxy.workstation</name>
+    <description>Workstation for authenticating with proxy server.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.attempts.maximum</name>
+    <value>20</value>
+    <description>How many times we should retry commands on transient errors.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.connection.establish.timeout</name>
+    <value>5000</value>
+    <description>Socket connection setup timeout in milliseconds.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.connection.timeout</name>
+    <value>200000</value>
+    <description>Socket connection timeout in milliseconds.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.socket.send.buffer</name>
+    <value>8192</value>
+    <description>Socket send buffer hint to amazon connector. Represented in bytes.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.socket.recv.buffer</name>
+    <value>8192</value>
+    <description>Socket receive buffer hint to amazon connector. Represented in bytes.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.paging.maximum</name>
+    <value>5000</value>
+    <description>How many keys to request from S3 when doing
+      directory listings at a time.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.threads.max</name>
+    <value>10</value>
+    <description>The total number of threads available in the filesystem for data
+      uploads *or any other queued filesystem operation*.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.threads.keepalivetime</name>
+    <value>60</value>
+    <description>Number of seconds a thread can be idle before being
+      terminated.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.max.total.tasks</name>
+    <value>5</value>
+    <description>The number of operations which can be queued for execution</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.multipart.size</name>
+    <value>100M</value>
+    <description>How big (in bytes) to split upload or copy operations up into.
+      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.multipart.threshold</name>
+    <value>2147483647</value>
+    <description>How big (in bytes) to split upload or copy operations up into.
+      This also controls the partition size in renamed files, as rename() involves
+      copying the source file(s).
+      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.multiobjectdelete.enable</name>
+    <value>true</value>
+    <description>When enabled, multiple single-object delete requests are replaced by
+      a single 'delete multiple objects'-request, reducing the number of requests.
+      Beware: legacy S3-compatible object stores might not support this request.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.acl.default</name>
+    <description>Set a canned ACL for newly created and copied objects. Value may be Private,
+      PublicRead, PublicReadWrite, AuthenticatedRead, LogDeliveryWrite, BucketOwnerRead,
+      or BucketOwnerFullControl.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.multipart.purge</name>
+    <value>false</value>
+    <description>True if you want to purge existing multipart uploads that may not have been
+      completed/aborted correctly. The corresponding purge age is defined in
+      fs.s3a.multipart.purge.age.
+      If set, when the filesystem is instantiated then all outstanding uploads
+      older than the purge age will be terminated -across the entire bucket.
+      This will impact multipart uploads by other applications and users. so should
+      be used sparingly, with an age value chosen to stop failed uploads, without
+      breaking ongoing operations.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.multipart.purge.age</name>
+    <value>86400</value>
+    <description>Minimum age in seconds of multipart uploads to purge.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.server-side-encryption-algorithm</name>
+    <description>Specify a server-side encryption algorithm for s3a: file system.
+      Unset by default.  It supports the following values: 'AES256' (for SSE-S3),
+      'SSE-KMS' and 'SSE-C'.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.server-side-encryption.key</name>
+    <description>Specific encryption key to use if fs.s3a.server-side-encryption-algorithm
+      has been set to 'SSE-KMS' or 'SSE-C'. In the case of SSE-C, the value of this property
+      should be the Base64 encoded key. If you are using SSE-KMS and leave this property empty,
+      you'll be using your default's S3 KMS key, otherwise you should set this property to
+      the specific KMS key id.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.signing-algorithm</name>
+    <description>Override the default signing algorithm so legacy
+      implementations can still be used</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.block.size</name>
+    <value>32M</value>
+    <description>Block size to use when reading files using s3a: file system.
+      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.buffer.dir</name>
+    <value>${hadoop.tmp.dir}/s3a</value>
+    <description>Comma separated list of directories that will be used to buffer file
+      uploads to.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.fast.upload.buffer</name>
+    <value>disk</value>
+    <description>
+      The buffering mechanism to for data being written.
+      Values: disk, array, bytebuffer.
+
+      "disk" will use the directories listed in fs.s3a.buffer.dir as
+      the location(s) to save data prior to being uploaded.
+
+      "array" uses arrays in the JVM heap
+
+      "bytebuffer" uses off-heap memory within the JVM.
+
+      Both "array" and "bytebuffer" will consume memory in a single stream up to the number
+      of blocks set by:
+
+      fs.s3a.multipart.size * fs.s3a.fast.upload.active.blocks.
+
+      If using either of these mechanisms, keep this value low
+
+      The total number of threads performing work across all threads is set by
+      fs.s3a.threads.max, with fs.s3a.max.total.tasks values setting the number of queued
+      work items.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.fast.upload.active.blocks</name>
+    <value>4</value>
+    <description>
+      Maximum Number of blocks a single output stream can have
+      active (uploading, or queued to the central FileSystem
+      instance's pool of queued operations.
+
+      This stops a single stream overloading the shared thread pool.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.readahead.range</name>
+    <value>64K</value>
+    <description>Bytes to read ahead during a seek() before closing and
+      re-opening the S3 HTTP connection. This option will be overridden if
+      any call to setReadahead() is made to an open stream.
+      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.user.agent.prefix</name>
+    <value></value>
+    <description>
+      Sets a custom value that will be prepended to the User-Agent header sent in
+      HTTP requests to the S3 back-end by S3AFileSystem.  The User-Agent header
+      always includes the Hadoop version number followed by a string generated by
+      the AWS SDK.  An example is "User-Agent: Hadoop 2.8.0, aws-sdk-java/1.10.6".
+      If this optional property is set, then its value is prepended to create a
+      customized User-Agent.  For example, if this configuration property was set
+      to "MyApp", then an example of the resulting User-Agent would be
+      "User-Agent: MyApp, Hadoop 2.8.0, aws-sdk-java/1.10.6".
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.metadatastore.authoritative</name>
+    <value>false</value>
+    <description>
+      When true, allow MetadataStore implementations to act as source of
+      truth for getting file status and directory listings.  Even if this
+      is set to true, MetadataStore implementations may choose not to
+      return authoritative results.  If the configured MetadataStore does
+      not support being authoritative, this setting will have no effect.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.metadatastore.impl</name>
+    <value>org.apache.hadoop.fs.s3a.s3guard.NullMetadataStore</value>
+    <description>
+      Fully-qualified name of the class that implements the MetadataStore
+      to be used by s3a.  The default class, NullMetadataStore, has no
+      effect: s3a will continue to treat the backing S3 service as the one
+      and only source of truth for file and directory metadata.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.cli.prune.age</name>
+    <value>86400000</value>
+    <description>
+      Default age (in milliseconds) after which to prune metadata from the
+      metadatastore when the prune command is run.  Can be overridden on the
+      command-line.
+    </description>
+  </property>
+
+
+  <property>
+    <name>fs.s3a.impl</name>
+    <value>org.apache.hadoop.fs.s3a.S3AFileSystem</value>
+    <description>The implementation class of the S3A Filesystem</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.ddb.region</name>
+    <value></value>
+    <description>
+      AWS DynamoDB region to connect to. An up-to-date list is
+      provided in the AWS Documentation: regions and endpoints. Without this
+      property, the S3Guard will operate table in the associated S3 bucket region.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.ddb.table</name>
+    <value></value>
+    <description>
+      The DynamoDB table name to operate. Without this property, the respective
+      S3 bucket name will be used.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.ddb.table.create</name>
+    <value>false</value>
+    <description>
+      If true, the S3A client will create the table if it does not already exist.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.ddb.table.capacity.read</name>
+    <value>500</value>
+    <description>
+      Provisioned throughput requirements for read operations in terms of capacity
+      units for the DynamoDB table.  This config value will only be used when
+      creating a new DynamoDB table, though later you can manually provision by
+      increasing or decreasing read capacity as needed for existing tables.
+      See DynamoDB documents for more information.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.ddb.table.capacity.write</name>
+    <value>100</value>
+    <description>
+      Provisioned throughput requirements for write operations in terms of
+      capacity units for the DynamoDB table.  Refer to related config
+      fs.s3a.s3guard.ddb.table.capacity.read before usage.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.ddb.max.retries</name>
+    <value>9</value>
+    <description>
+      Max retries on batched DynamoDB operations before giving up and
+      throwing an IOException.  Each retry is delayed with an exponential
+      backoff timer which starts at 100 milliseconds and approximately
+      doubles each time.  The minimum wait before throwing an exception is
+      sum(100, 200, 400, 800, .. 100*2^N-1 ) == 100 * ((2^N)-1)
+      So N = 9 yields at least 51.1 seconds (51,100) milliseconds of blocking
+      before throwing an IOException.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.s3a.s3guard.ddb.background.sleep</name>
+    <value>25</value>
+    <description>
+      Length (in milliseconds) of pause between each batch of deletes when
+      pruning metadata.  Prevents prune operations (which can typically be low
+      priority background operations) from overly interfering with other I/O
+      operations.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.s3a.impl</name>
+    <value>org.apache.hadoop.fs.s3a.S3A</value>
+    <description>The implementation class of the S3A AbstractFileSystem.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.list.version</name>
+    <value>2</value>
+    <description>
+      Select which version of the S3 SDK's List Objects API to use.  Currently
+      support 2 (default) and 1 (older API).
+    </description>
+  </property>
+
+  <!-- Azure file system properties -->
+  <property>
+    <name>fs.wasb.impl</name>
+    <value>org.apache.hadoop.fs.azure.NativeAzureFileSystem</value>
+    <description>The implementation class of the Native Azure Filesystem</description>
+  </property>
+
+  <property>
+    <name>fs.wasbs.impl</name>
+    <value>org.apache.hadoop.fs.azure.NativeAzureFileSystem$Secure</value>
+    <description>The implementation class of the Secure Native Azure Filesystem</description>
+  </property>
+
+  <property>
+    <name>fs.azure.secure.mode</name>
+    <value>false</value>
+    <description>
+      Config flag to identify the mode in which fs.azure.NativeAzureFileSystem needs
+      to run under. Setting it "true" would make fs.azure.NativeAzureFileSystem use
+      SAS keys to communicate with Azure storage.
+    </description>
+  </property>
+  <property>
+    <name>fs.azure.local.sas.key.mode</name>
+    <value>false</value>
+    <description>
+      Works in conjuction with fs.azure.secure.mode. Setting this config to true
+      results in fs.azure.NativeAzureFileSystem using the local SAS key generation
+      where the SAS keys are generating in the same process as fs.azure.NativeAzureFileSystem.
+      If fs.azure.secure.mode flag is set to false, this flag has no effect.
+    </description>
+  </property>
+  <property>
+    <name>fs.azure.sas.expiry.period</name>
+    <value>90d</value>
+    <description>
+      The default value to be used for expiration period for SAS keys generated.
+      Can use the following suffix (case insensitive):
+      ms(millis), s(sec), m(min), h(hour), d(day)
+      to specify the time (such as 2s, 2m, 1h, etc.).
+    </description>
+  </property>
+  <property>
+    <name>fs.azure.authorization</name>
+    <value>false</value>
+    <description>
+      Config flag to enable authorization support in WASB. Setting it to "true" enables
+      authorization support to WASB. Currently WASB authorization requires a remote service
+      to provide authorization that needs to be specified via fs.azure.authorization.remote.service.url
+      configuration
+    </description>
+  </property>
+  <property>
+    <name>fs.azure.authorization.caching.enable</name>
+    <value>true</value>
+    <description>
+      Config flag to enable caching of authorization results and saskeys in WASB.
+      This flag is relevant only when fs.azure.authorization is enabled.
+    </description>
+  </property>
+  <property>
+    <name>fs.azure.saskey.usecontainersaskeyforallaccess</name>
+    <value>true</value>
+    <description>
+      Use container saskey for access to all blobs within the container.
+      Blob-specific saskeys are not used when this setting is enabled.
+      This setting provides better performance compared to blob-specific saskeys.
+    </description>
+  </property>
+  <property>
+    <name>io.seqfile.compress.blocksize</name>
+    <value>1000000</value>
+    <description>The minimum block size for compression in block compressed
+      SequenceFiles.
+    </description>
+  </property>
+
+  <property>
+    <name>io.mapfile.bloom.size</name>
+    <value>1048576</value>
+    <description>The size of BloomFilter-s used in BloomMapFile. Each time this many
+      keys is appended the next BloomFilter will be created (inside a DynamicBloomFilter).
+      Larger values minimize the number of filters, which slightly increases the performance,
+      but may waste too much space if the total number of keys is usually much smaller
+      than this number.
+    </description>
+  </property>
+
+  <property>
+    <name>io.mapfile.bloom.error.rate</name>
+    <value>0.005</value>
+    <description>The rate of false positives in BloomFilter-s used in BloomMapFile.
+      As this value decreases, the size of BloomFilter-s increases exponentially. This
+      value is the probability of encountering false positives (default is 0.5%).
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.util.hash.type</name>
+    <value>murmur</value>
+    <description>The default implementation of Hash. Currently this can take one of the
+      two values: 'murmur' to select MurmurHash and 'jenkins' to select JenkinsHash.
+    </description>
+  </property>
+
+
+  <!-- ipc properties -->
+
+  <property>
+    <name>ipc.client.idlethreshold</name>
+    <value>4000</value>
+    <description>Defines the threshold number of connections after which
+      connections will be inspected for idleness.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.kill.max</name>
+    <value>10</value>
+    <description>Defines the maximum number of clients to disconnect in one go.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.connection.maxidletime</name>
+    <value>10000</value>
+    <description>The maximum time in msec after which a client will bring down the
+      connection to the server.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.connect.max.retries</name>
+    <value>10</value>
+    <description>Indicates the number of retries a client will make to establish
+      a server connection.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.connect.retry.interval</name>
+    <value>1000</value>
+    <description>Indicates the number of milliseconds a client will wait for
+      before retrying to establish a server connection.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.connect.timeout</name>
+    <value>20000</value>
+    <description>Indicates the number of milliseconds a client will wait for the
+      socket to establish a server connection.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.connect.max.retries.on.timeouts</name>
+    <value>45</value>
+    <description>Indicates the number of retries a client will make on socket timeout
+      to establish a server connection.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.tcpnodelay</name>
+    <value>true</value>
+    <description>Use TCP_NODELAY flag to bypass Nagle's algorithm transmission delays.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.low-latency</name>
+    <value>false</value>
+    <description>Use low-latency QoS markers for IPC connections.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.ping</name>
+    <value>true</value>
+    <description>Send a ping to the server when timeout on reading the response,
+      if set to true. If no failure is detected, the client retries until at least
+      a byte is read or the time given by ipc.client.rpc-timeout.ms is passed.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.ping.interval</name>
+    <value>60000</value>
+    <description>Timeout on waiting response from server, in milliseconds.
+      The client will send ping when the interval is passed without receiving bytes,
+      if ipc.client.ping is set to true.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.rpc-timeout.ms</name>
+    <value>0</value>
+    <description>Timeout on waiting response from server, in milliseconds.
+      If ipc.client.ping is set to true and this rpc-timeout is greater than
+      the value of ipc.ping.interval, the effective value of the rpc-timeout is
+      rounded up to multiple of ipc.ping.interval.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.server.listen.queue.size</name>
+    <value>128</value>
+    <description>Indicates the length of the listen queue for servers accepting
+      client connections.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.server.log.slow.rpc</name>
+    <value>false</value>
+    <description>This setting is useful to troubleshoot performance issues for
+      various services. If this value is set to true then we log requests that
+      fall into 99th percentile as well as increment RpcSlowCalls counter.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.maximum.data.length</name>
+    <value>67108864</value>
+    <description>This indicates the maximum IPC message length (bytes) that can be
+      accepted by the server. Messages larger than this value are rejected by the
+      immediately to avoid possible OOMs. This setting should rarely need to be
+      changed.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.maximum.response.length</name>
+    <value>134217728</value>
+    <description>This indicates the maximum IPC message length (bytes) that can be
+      accepted by the client. Messages larger than this value are rejected
+      immediately to avoid possible OOMs. This setting should rarely need to be
+      changed.  Set to 0 to disable.
+    </description>
+  </property>
+
+  <!-- Proxy Configuration -->
+
+  <property>
+    <name>hadoop.security.impersonation.provider.class</name>
+    <value></value>
+    <description>A class which implements ImpersonationProvider interface, used to
+      authorize whether one user can impersonate a specific user.
+      If not specified, the DefaultImpersonationProvider will be used.
+      If a class is specified, then that class will be used to determine
+      the impersonation capability.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.rpc.socket.factory.class.default</name>
+    <value>org.apache.hadoop.net.StandardSocketFactory</value>
+    <description> Default SocketFactory to use. This parameter is expected to be
+      formatted as "package.FactoryClassName".
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.rpc.socket.factory.class.ClientProtocol</name>
+    <value></value>
+    <description> SocketFactory to use to connect to a DFS. If null or empty, use
+      hadoop.rpc.socket.class.default. This socket factory is also used by
+      DFSClient to create sockets to DataNodes.
+    </description>
+  </property>
+
+
+
+  <property>
+    <name>hadoop.socks.server</name>
+    <value></value>
+    <description> Address (host:port) of the SOCKS server to be used by the
+      SocksSocketFactory.
+    </description>
+  </property>
+
+  <!-- Topology Configuration -->
+  <property>
+    <name>net.topology.node.switch.mapping.impl</name>
+    <value>org.apache.hadoop.net.ScriptBasedMapping</value>
+    <description> The default implementation of the DNSToSwitchMapping. It
+      invokes a script specified in net.topology.script.file.name to resolve
+      node names. If the value for net.topology.script.file.name is not set, the
+      default value of DEFAULT_RACK is returned for all node names.
+    </description>
+  </property>
+
+  <property>
+    <name>net.topology.impl</name>
+    <value>org.apache.hadoop.net.NetworkTopology</value>
+    <description> The default implementation of NetworkTopology which is classic three layer one.
+    </description>
+  </property>
+
+  <property>
+    <name>net.topology.script.file.name</name>
+    <value></value>
+    <description> The script name that should be invoked to resolve DNS names to
+      NetworkTopology names. Example: the script would take host.foo.bar as an
+      argument, and return /rack1 as the output.
+    </description>
+  </property>
+
+  <property>
+    <name>net.topology.script.number.args</name>
+    <value>100</value>
+    <description> The max number of args that the script configured with
+      net.topology.script.file.name should be run with. Each arg is an
+      IP address.
+    </description>
+  </property>
+
+  <property>
+    <name>net.topology.table.file.name</name>
+    <value></value>
+    <description> The file name for a topology file, which is used when the
+      net.topology.node.switch.mapping.impl property is set to
+      org.apache.hadoop.net.TableMapping. The file format is a two column text
+      file, with columns separated by whitespace. The first column is a DNS or
+      IP address and the second column specifies the rack where the address maps.
+      If no entry corresponding to a host in the cluster is found, then
+      /default-rack is assumed.
+    </description>
+  </property>
+
+  <!-- Local file system -->
+  <property>
+    <name>file.stream-buffer-size</name>
+    <value>4096</value>
+    <description>The size of buffer to stream files.
+      The size of this buffer should probably be a multiple of hardware
+      page size (4096 on Intel x86), and it determines how much data is
+      buffered during read and write operations.</description>
+  </property>
+
+  <property>
+    <name>file.bytes-per-checksum</name>
+    <value>512</value>
+    <description>The number of bytes per checksum.  Must not be larger than
+      file.stream-buffer-size</description>
+  </property>
+
+  <property>
+    <name>file.client-write-packet-size</name>
+    <value>65536</value>
+    <description>Packet size for clients to write</description>
+  </property>
+
+  <property>
+    <name>file.blocksize</name>
+    <value>67108864</value>
+    <description>Block size</description>
+  </property>
+
+  <property>
+    <name>file.replication</name>
+    <value>1</value>
+    <description>Replication factor</description>
+  </property>
+
+  <!-- FTP file system -->
+  <property>
+    <name>ftp.stream-buffer-size</name>
+    <value>4096</value>
+    <description>The size of buffer to stream files.
+      The size of this buffer should probably be a multiple of hardware
+      page size (4096 on Intel x86), and it determines how much data is
+      buffered during read and write operations.</description>
+  </property>
+
+  <property>
+    <name>ftp.bytes-per-checksum</name>
+    <value>512</value>
+    <description>The number of bytes per checksum.  Must not be larger than
+      ftp.stream-buffer-size</description>
+  </property>
+
+  <property>
+    <name>ftp.client-write-packet-size</name>
+    <value>65536</value>
+    <description>Packet size for clients to write</description>
+  </property>
+
+  <property>
+    <name>ftp.blocksize</name>
+    <value>67108864</value>
+    <description>Block size</description>
+  </property>
+
+  <property>
+    <name>ftp.replication</name>
+    <value>3</value>
+    <description>Replication factor</description>
+  </property>
+
+  <!-- Tfile -->
+
+  <property>
+    <name>tfile.io.chunk.size</name>
+    <value>1048576</value>
+    <description>
+      Value chunk size in bytes. Default  to
+      1MB. Values of the length less than the chunk size is
+      guaranteed to have known value length in read time (See also
+      TFile.Reader.Scanner.Entry.isValueLengthKnown()).
+    </description>
+  </property>
+
+  <property>
+    <name>tfile.fs.output.buffer.size</name>
+    <value>262144</value>
+    <description>
+      Buffer size used for FSDataOutputStream in bytes.
+    </description>
+  </property>
+
+  <property>
+    <name>tfile.fs.input.buffer.size</name>
+    <value>262144</value>
+    <description>
+      Buffer size used for FSDataInputStream in bytes.
+    </description>
+  </property>
+
+  <!-- HTTP web-consoles Authentication -->
+
+  <property>
+    <name>hadoop.http.authentication.type</name>
+    <value>simple</value>
+    <description>
+      Defines authentication used for Oozie HTTP endpoint.
+      Supported values are: simple | kerberos | #AUTHENTICATION_HANDLER_CLASSNAME#
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.http.authentication.token.validity</name>
+    <value>36000</value>
+    <description>
+      Indicates how long (in seconds) an authentication token is valid before it has
+      to be renewed.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.http.authentication.signature.secret.file</name>
+    <value>${user.home}/hadoop-http-auth-signature-secret</value>
+    <description>
+      The signature secret for signing the authentication tokens.
+      The same secret should be used for JT/NN/DN/TT configurations.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.http.authentication.cookie.domain</name>
+    <value></value>
+    <description>
+      The domain to use for the HTTP cookie that stores the authentication token.
+      In order to authentiation to work correctly across all Hadoop nodes web-consoles
+      the domain must be correctly set.
+      IMPORTANT: when using IP addresses, browsers ignore cookies with domain settings.
+      For this setting to work properly all nodes in the cluster must be configured
+      to generate URLs with hostname.domain names on it.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.http.authentication.simple.anonymous.allowed</name>
+    <value>true</value>
+    <description>
+      Indicates if anonymous requests are allowed when using 'simple' authentication.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.http.authentication.kerberos.principal</name>
+    <value>HTTP/_HOST@LOCALHOST</value>
+    <description>
+      Indicates the Kerberos principal to be used for HTTP endpoint.
+      The principal MUST start with 'HTTP/' as per Kerberos HTTP SPNEGO specification.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.http.authentication.kerberos.keytab</name>
+    <value>${user.home}/hadoop.keytab</value>
+    <description>
+      Location of the keytab file with the credentials for the principal.
+      Referring to the same keytab file Oozie uses for its Kerberos credentials for Hadoop.
+    </description>
+  </property>
+
+  <!-- HTTP CORS support -->
+  <property>
+    <name>hadoop.http.cross-origin.enabled</name>
+    <value>false</value>
+    <description>Enable/disable the cross-origin (CORS) filter.</description>
+  </property>
+
+  <property>
+    <name>hadoop.http.cross-origin.allowed-origins</name>
+    <value>*</value>
+    <description>Comma separated list of origins that are allowed for web
+      services needing cross-origin (CORS) support. Wildcards (*) and patterns
+      allowed</description>
+  </property>
+
+  <property>
+    <name>hadoop.http.cross-origin.allowed-methods</name>
+    <value>GET,POST,HEAD</value>
+    <description>Comma separated list of methods that are allowed for web
+      services needing cross-origin (CORS) support.</description>
+  </property>
+
+  <property>
+    <name>hadoop.http.cross-origin.allowed-headers</name>
+    <value>X-Requested-With,Content-Type,Accept,Origin</value>
+    <description>Comma separated list of headers that are allowed for web
+      services needing cross-origin (CORS) support.</description>
+  </property>
+
+  <property>
+    <name>hadoop.http.cross-origin.max-age</name>
+    <value>1800</value>
+    <description>The number of seconds a pre-flighted request can be cached
+      for web services needing cross-origin (CORS) support.</description>
+  </property>
+
+  <property>
+    <name>dfs.ha.fencing.methods</name>
+    <value></value>
+    <description>
+      List of fencing methods to use for service fencing. May contain
+      builtin methods (eg shell and sshfence) or user-defined method.
+    </description>
+  </property>
+
+  <property>
+    <name>dfs.ha.fencing.ssh.connect-timeout</name>
+    <value>30000</value>
+    <description>
+      SSH connection timeout, in milliseconds, to use with the builtin
+      sshfence fencer.
+    </description>
+  </property>
+
+  <property>
+    <name>dfs.ha.fencing.ssh.private-key-files</name>
+    <value></value>
+    <description>
+      The SSH private key files to use with the builtin sshfence fencer.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.zookeeper.quorum</name>
+    <description>
+      A list of ZooKeeper server addresses, separated by commas, that are
+      to be used by the ZKFailoverController in automatic failover.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.zookeeper.session-timeout.ms</name>
+    <value>5000</value>
+    <description>
+      The session timeout to use when the ZKFC connects to ZooKeeper.
+      Setting this value to a lower value implies that server crashes
+      will be detected more quickly, but risks triggering failover too
+      aggressively in the case of a transient error or network blip.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.zookeeper.parent-znode</name>
+    <value>/hadoop-ha</value>
+    <description>
+      The ZooKeeper znode under which the ZK failover controller stores
+      its information. Note that the nameservice ID is automatically
+      appended to this znode, so it is not normally necessary to
+      configure this, even in a federated environment.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.zookeeper.acl</name>
+    <value>world:anyone:rwcda</value>
+    <description>
+      A comma-separated list of ZooKeeper ACLs to apply to the znodes
+      used by automatic failover. These ACLs are specified in the same
+      format as used by the ZooKeeper CLI.
+
+      If the ACL itself contains secrets, you may instead specify a
+      path to a file, prefixed with the '@' symbol, and the value of
+      this configuration will be loaded from within.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.zookeeper.auth</name>
+    <value></value>
+    <description>
+      A comma-separated list of ZooKeeper authentications to add when
+      connecting to ZooKeeper. These are specified in the same format
+      as used by the &quot;addauth&quot; command in the ZK CLI. It is
+      important that the authentications specified here are sufficient
+      to access znodes with the ACL specified in ha.zookeeper.acl.
+
+      If the auths contain secrets, you may instead specify a
+      path to a file, prefixed with the '@' symbol, and the value of
+      this configuration will be loaded from within.
+    </description>
+  </property>
+
+  <!-- Static Web User Filter properties. -->
+  <property>
+    <name>hadoop.http.staticuser.user</name>
+    <value>dr.who</value>
+    <description>
+      The user name to filter as, on static web filters
+      while rendering content. An example use is the HDFS
+      web UI (user to be used for browsing files).
+    </description>
+  </property>
+
+  <!-- SSLFactory configuration -->
+
+  <property>
+    <name>hadoop.ssl.keystores.factory.class</name>
+    <value>org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory</value>
+    <description>
+      The keystores factory to use for retrieving certificates.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.ssl.require.client.cert</name>
+    <value>false</value>
+    <description>Whether client certificates are required</description>
+  </property>
+
+  <property>
+    <name>hadoop.ssl.hostname.verifier</name>
+    <value>DEFAULT</value>
+    <description>
+      The hostname verifier to provide for HttpsURLConnections.
+      Valid values are: DEFAULT, STRICT, STRICT_IE6, DEFAULT_AND_LOCALHOST and
+      ALLOW_ALL
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.ssl.server.conf</name>
+    <value>ssl-server.xml</value>
+    <description>
+      Resource file from which ssl server keystore information will be extracted.
+      This file is looked up in the classpath, typically it should be in Hadoop
+      conf/ directory.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.ssl.client.conf</name>
+    <value>ssl-client.xml</value>
+    <description>
+      Resource file from which ssl client keystore information will be extracted
+      This file is looked up in the classpath, typically it should be in Hadoop
+      conf/ directory.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.ssl.enabled</name>
+    <value>false</value>
+    <description>
+      Deprecated. Use dfs.http.policy and yarn.http.policy instead.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.ssl.enabled.protocols</name>
+    <value>TLSv1,SSLv2Hello,TLSv1.1,TLSv1.2</value>
+    <description>
+      The supported SSL protocols.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.jetty.logs.serve.aliases</name>
+    <value>true</value>
+    <description>
+      Enable/Disable aliases serving from jetty
+    </description>
+  </property>
+
+  <property>
+    <name>fs.permissions.umask-mode</name>
+    <value>022</value>
+    <description>
+      The umask used when creating files and directories.
+      Can be in octal or in symbolic. Examples are:
+      "022" (octal for u=rwx,g=r-x,o=r-x in symbolic),
+      or "u=rwx,g=rwx,o=" (symbolic for 007 in octal).
+    </description>
+  </property>
+
+  <!-- ha properties -->
+
+  <property>
+    <name>ha.health-monitor.connect-retry-interval.ms</name>
+    <value>1000</value>
+    <description>
+      How often to retry connecting to the service.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.health-monitor.check-interval.ms</name>
+    <value>1000</value>
+    <description>
+      How often to check the service.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.health-monitor.sleep-after-disconnect.ms</name>
+    <value>1000</value>
+    <description>
+      How long to sleep after an unexpected RPC error.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.health-monitor.rpc-timeout.ms</name>
+    <value>45000</value>
+    <description>
+      Timeout for the actual monitorHealth() calls.
+    </description>
+  </property>
+
+  <property>
+    <name>ha.failover-controller.new-active.rpc-timeout.ms</name>
+    <value>60000</value>
+    <description>
+      Timeout that the FC waits for the new active to become active
+    </description>
+  </property>
+
+  <property>
+    <name>ha.failover-controller.graceful-fence.rpc-timeout.ms</name>
+    <value>5000</value>
+    <description>
+      Timeout that the FC waits for the old active to go to standby
+    </description>
+  </property>
+
+  <property>
+    <name>ha.failover-controller.graceful-fence.connection.retries</name>
+    <value>1</value>
+    <description>
+      FC connection retries for graceful fencing
+    </description>
+  </property>
+
+  <property>
+    <name>ha.failover-controller.cli-check.rpc-timeout.ms</name>
+    <value>20000</value>
+    <description>
+      Timeout that the CLI (manual) FC waits for monitorHealth, getServiceState
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.client.fallback-to-simple-auth-allowed</name>
+    <value>false</value>
+    <description>
+      When a client is configured to attempt a secure connection, but attempts to
+      connect to an insecure server, that server may instruct the client to
+      switch to SASL SIMPLE (unsecure) authentication. This setting controls
+      whether or not the client will accept this instruction from the server.
+      When false (the default), the client will not allow the fallback to SIMPLE
+      authentication, and will abort the connection.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.client.resolve.remote.symlinks</name>
+    <value>true</value>
+    <description>
+      Whether to resolve symlinks when accessing a remote Hadoop filesystem.
+      Setting this to false causes an exception to be thrown upon encountering
+      a symlink. This setting does not apply to local filesystems, which
+      automatically resolve local symlinks.
+    </description>
+  </property>
+
+  <property>
+    <name>nfs.exports.allowed.hosts</name>
+    <value>* rw</value>
+    <description>
+      By default, the export can be mounted by any client. The value string
+      contains machine name and access privilege, separated by whitespace
+      characters. The machine name format can be a single host, a Java regular
+      expression, or an IPv4 address. The access privilege uses rw or ro to
+      specify read/write or read-only access of the machines to exports. If the
+      access privilege is not provided, the default is read-only. Entries are separated by ";".
+      For example: "192.168.0.0/22 rw ; host.*\.example\.com ; host1.test.org ro;".
+      Only the NFS gateway needs to restart after this property is updated.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.user.group.static.mapping.overrides</name>
+    <value>dr.who=;</value>
+    <description>
+      Static mapping of user to groups. This will override the groups if
+      available in the system for the specified user. In other words, groups
+      look-up will not happen for these users, instead groups mapped in this
+      configuration will be used.
+      Mapping should be in this format.
+      user1=group1,group2;user2=;user3=group2;
+      Default, "dr.who=;" will consider "dr.who" as user without groups.
+    </description>
+  </property>
+
+  <property>
+    <name>rpc.metrics.quantile.enable</name>
+    <value>false</value>
+    <description>
+      Setting this property to true and rpc.metrics.percentiles.intervals
+      to a comma-separated list of the granularity in seconds, the
+      50/75/90/95/99th percentile latency for rpc queue/processing time in
+      milliseconds are added to rpc metrics.
+    </description>
+  </property>
+
+  <property>
+    <name>rpc.metrics.percentiles.intervals</name>
+    <value></value>
+    <description>
+      A comma-separated list of the granularity in seconds for the metrics which
+      describe the 50/75/90/95/99th percentile latency for rpc queue/processing
+      time. The metrics are outputted if rpc.metrics.quantile.enable is set to
+      true.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.crypto.codec.classes.EXAMPLECIPHERSUITE</name>
+    <value></value>
+    <description>
+      The prefix for a given crypto codec, contains a comma-separated
+      list of implementation classes for a given crypto codec (eg EXAMPLECIPHERSUITE).
+      The first implementation will be used if available, others are fallbacks.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.crypto.codec.classes.aes.ctr.nopadding</name>
+    <value>org.apache.hadoop.crypto.OpensslAesCtrCryptoCodec, org.apache.hadoop.crypto.JceAesCtrCryptoCodec</value>
+    <description>
+      Comma-separated list of crypto codec implementations for AES/CTR/NoPadding.
+      The first implementation will be used if available, others are fallbacks.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.crypto.cipher.suite</name>
+    <value>AES/CTR/NoPadding</value>
+    <description>
+      Cipher suite for crypto codec.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.crypto.jce.provider</name>
+    <value></value>
+    <description>
+      The JCE provider name used in CryptoCodec.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.crypto.buffer.size</name>
+    <value>8192</value>
+    <description>
+      The buffer size used by CryptoInputStream and CryptoOutputStream.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.java.secure.random.algorithm</name>
+    <value>SHA1PRNG</value>
+    <description>
+      The java secure random algorithm.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.secure.random.impl</name>
+    <value></value>
+    <description>
+      Implementation of secure random.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.random.device.file.path</name>
+    <value>/dev/urandom</value>
+    <description>
+      OS security random device file path.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.key.provider.path</name>
+    <description>
+      The KeyProvider to use when managing zone keys, and interacting with
+      encryption keys when reading and writing to an encryption zone.
+      For hdfs clients, the provider path will be same as namenode's
+      provider path.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.har.impl.disable.cache</name>
+    <value>true</value>
+    <description>Don't cache 'har' filesystem instances.</description>
+  </property>
+
+  <!--- KMSClientProvider configurations -->
+  <property>
+    <name>hadoop.security.kms.client.authentication.retry-count</name>
+    <value>1</value>
+    <description>
+      Number of time to retry connecting to KMS on authentication failure
+    </description>
+  </property>
+  <property>
+    <name>hadoop.security.kms.client.encrypted.key.cache.size</name>
+    <value>500</value>
+    <description>
+      Size of the EncryptedKeyVersion cache Queue for each key
+    </description>
+  </property>
+  <property>
+    <name>hadoop.security.kms.client.encrypted.key.cache.low-watermark</name>
+    <value>0.3f</value>
+    <description>
+      If size of the EncryptedKeyVersion cache Queue falls below the
+      low watermark, this cache queue will be scheduled for a refill
+    </description>
+  </property>
+  <property>
+    <name>hadoop.security.kms.client.encrypted.key.cache.num.refill.threads</name>
+    <value>2</value>
+    <description>
+      Number of threads to use for refilling depleted EncryptedKeyVersion
+      cache Queues
+    </description>
+  </property>
+  <property>
+    <name>hadoop.security.kms.client.encrypted.key.cache.expiry</name>
+    <value>43200000</value>
+    <description>
+      Cache expiry time for a Key, after which the cache Queue for this
+      key will be dropped. Default = 12hrs
+    </description>
+  </property>
+  <property>
+    <name>hadoop.security.kms.client.timeout</name>
+    <value>60</value>
+    <description>
+      Sets value for KMS client connection timeout, and the read timeout
+      to KMS servers.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.kms.client.failover.sleep.base.millis</name>
+    <value>100</value>
+    <description>
+      Expert only. The time to wait, in milliseconds, between failover
+      attempts increases exponentially as a function of the number of
+      attempts made so far, with a random factor of +/- 50%. This option
+      specifies the base value used in the failover calculation. The
+      first failover will retry immediately. The 2nd failover attempt
+      will delay at least hadoop.security.client.failover.sleep.base.millis
+      milliseconds. And so on.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.security.kms.client.failover.sleep.max.millis</name>
+    <value>2000</value>
+    <description>
+      Expert only. The time to wait, in milliseconds, between failover
+      attempts increases exponentially as a function of the number of
+      attempts made so far, with a random factor of +/- 50%. This option
+      specifies the maximum value to wait between failovers.
+      Specifically, the time between two failover attempts will not
+      exceed +/- 50% of hadoop.security.client.failover.sleep.max.millis
+      milliseconds.
+    </description>
+  </property>
+
+  <property>
+    <name>ipc.server.max.connections</name>
+    <value>0</value>
+    <description>The maximum number of concurrent connections a server is allowed
+      to accept. If this limit is exceeded, incoming connections will first fill
+      the listen queue and then may go to an OS-specific listen overflow queue.
+      The client may fail or timeout, but the server can avoid running out of file
+      descriptors using this feature. 0 means no limit.
+    </description>
+  </property>
+
+
+  <!-- YARN registry -->
+
+  <property>
+    <name>hadoop.registry.rm.enabled</name>
+    <value>false</value>
+    <description>
+      Is the registry enabled in the YARN Resource Manager?
+
+      If true, the YARN RM will, as needed.
+      create the user and system paths, and purge
+      service records when containers, application attempts
+      and applications complete.
+
+      If false, the paths must be created by other means,
+      and no automatic cleanup of service records will take place.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.zk.root</name>
+    <value>/registry</value>
+    <description>
+      The root zookeeper node for the registry
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.zk.session.timeout.ms</name>
+    <value>60000</value>
+    <description>
+      Zookeeper session timeout in milliseconds
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.zk.connection.timeout.ms</name>
+    <value>15000</value>
+    <description>
+      Zookeeper connection timeout in milliseconds
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.zk.retry.times</name>
+    <value>5</value>
+    <description>
+      Zookeeper connection retry count before failing
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.zk.retry.interval.ms</name>
+    <value>1000</value>
+    <description>
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.zk.retry.ceiling.ms</name>
+    <value>60000</value>
+    <description>
+      Zookeeper retry limit in milliseconds, during
+      exponential backoff.
+
+      This places a limit even
+      if the retry times and interval limit, combined
+      with the backoff policy, result in a long retry
+      period
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.zk.quorum</name>
+    <value>localhost:2181</value>
+    <description>
+      List of hostname:port pairs defining the
+      zookeeper quorum binding for the registry
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.secure</name>
+    <value>false</value>
+    <description>
+      Key to set if the registry is secure. Turning it on
+      changes the permissions policy from "open access"
+      to restrictions on kerberos with the option of
+      a user adding one or more auth key pairs down their
+      own tree.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.system.acls</name>
+    <value>sasl:yarn@, sasl:mapred@, sasl:hdfs@</value>
+    <description>
+      A comma separated list of Zookeeper ACL identifiers with
+      system access to the registry in a secure cluster.
+
+      These are given full access to all entries.
+
+      If there is an "@" at the end of a SASL entry it
+      instructs the registry client to append the default kerberos domain.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.kerberos.realm</name>
+    <value></value>
+    <description>
+      The kerberos realm: used to set the realm of
+      system principals which do not declare their realm,
+      and any other accounts that need the value.
+
+      If empty, the default realm of the running process
+      is used.
+
+      If neither are known and the realm is needed, then the registry
+      service/client will fail.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.registry.jaas.context</name>
+    <value>Client</value>
+    <description>
+      Key to define the JAAS context. Used in secure
+      mode
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.shell.missing.defaultFs.warning</name>
+    <value>false</value>
+    <description>
+      Enable hdfs shell commands to display warnings if (fs.defaultFS) property
+      is not set.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.shell.safely.delete.limit.num.files</name>
+    <value>100</value>
+    <description>Used by -safely option of hadoop fs shell -rm command to avoid
+      accidental deletion of large directories. When enabled, the -rm command
+      requires confirmation if the number of files to be deleted is greater than
+      this limit.  The default limit is 100 files. The warning is disabled if
+      the limit is 0 or the -safely is not specified in -rm command.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.client.htrace.sampler.classes</name>
+    <value></value>
+    <description>The class names of the HTrace Samplers to use for Hadoop
+      filesystem clients.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.htrace.span.receiver.classes</name>
+    <value></value>
+    <description>The class names of the Span Receivers to use for Hadoop.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.http.logs.enabled</name>
+    <value>true</value>
+    <description>
+      Enable the "/logs" endpoint on all Hadoop daemons, which serves local
+      logs, but may be considered a security risk due to it listing the contents
+      of a directory.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.client.resolve.topology.enabled</name>
+    <value>false</value>
+    <description>Whether the client machine will use the class specified by
+      property net.topology.node.switch.mapping.impl to compute the network
+      distance between itself and remote machines of the FileSystem. Additional
+      properties might need to be configured depending on the class specified
+      in net.topology.node.switch.mapping.impl. For example, if
+      org.apache.hadoop.net.ScriptBasedMapping is used, a valid script file
+      needs to be specified in net.topology.script.file.name.
+    </description>
+  </property>
+
+
+  <!-- Azure Data Lake File System Configurations -->
+
+  <property>
+    <name>fs.adl.impl</name>
+    <value>org.apache.hadoop.fs.adl.AdlFileSystem</value>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.adl.impl</name>
+    <value>org.apache.hadoop.fs.adl.Adl</value>
+  </property>
+
+  <property>
+    <name>adl.feature.ownerandgroup.enableupn</name>
+    <value>false</value>
+    <description>
+      When true : User and Group in FileStatus/AclStatus response is
+      represented as user friendly name as per Azure AD profile.
+
+      When false (default) : User and Group in FileStatus/AclStatus
+      response is represented by the unique identifier from Azure AD
+      profile (Object ID as GUID).
+
+      For optimal performance, false is recommended.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.access.token.provider.type</name>
+    <value>ClientCredential</value>
+    <description>
+      Defines Azure Active Directory OAuth2 access token provider type.
+      Supported types are ClientCredential, RefreshToken, MSI, DeviceCode,
+      and Custom.
+      The ClientCredential type requires property fs.adl.oauth2.client.id,
+      fs.adl.oauth2.credential, and fs.adl.oauth2.refresh.url.
+      The RefreshToken type requires property fs.adl.oauth2.client.id and
+      fs.adl.oauth2.refresh.token.
+      The MSI type reads optional property fs.adl.oauth2.msi.port, if specified.
+      The DeviceCode type requires property
+      fs.adl.oauth2.devicecode.clientapp.id.
+      The Custom type requires property fs.adl.oauth2.access.token.provider.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.client.id</name>
+    <value></value>
+    <description>The OAuth2 client id.</description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.credential</name>
+    <value></value>
+    <description>The OAuth2 access key.</description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.refresh.url</name>
+    <value></value>
+    <description>The OAuth2 token endpoint.</description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.refresh.token</name>
+    <value></value>
+    <description>The OAuth2 refresh token.</description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.access.token.provider</name>
+    <value></value>
+    <description>
+      The class name of the OAuth2 access token provider.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.msi.port</name>
+    <value></value>
+    <description>
+      The localhost port for the MSI token service. This is the port specified
+      when creating the Azure VM. The default, if this setting is not specified,
+      is 50342.
+      Used by MSI token provider.
+    </description>
+  </property>
+
+  <property>
+    <name>fs.adl.oauth2.devicecode.clientapp.id</name>
+    <value></value>
+    <description>
+      The app id of the AAD native app in whose context the auth request
+      should be made.
+      Used by DeviceCode token provider.
+    </description>
+  </property>
+
+  <!-- Azure Data Lake File System Configurations Ends Here-->
+
+  <property>
+    <name>hadoop.caller.context.enabled</name>
+    <value>false</value>
+    <description>When the feature is enabled, additional fields are written into
+      name-node audit log records for auditing coarse granularity operations.
+    </description>
+  </property>
+  <property>
+    <name>hadoop.caller.context.max.size</name>
+    <value>128</value>
+    <description>The maximum bytes a caller context string can have. If the
+      passed caller context is longer than this maximum bytes, client will
+      truncate it before sending to server. Note that the server may have a
+      different maximum size, and will truncate the caller context to the
+      maximum size it allows.
+    </description>
+  </property>
+  <property>
+    <name>hadoop.caller.context.signature.max.size</name>
+    <value>40</value>
+    <description>
+      The caller's signature (optional) is for offline validation. If the
+      signature exceeds the maximum allowed bytes in server, the caller context
+      will be abandoned, in which case the caller context will not be recorded
+      in audit logs.
+    </description>
+  </property>
+  <!-- SequenceFile's Sorter properties -->
+  <property>
+    <name>seq.io.sort.mb</name>
+    <value>100</value>
+    <description>
+      The total amount of buffer memory to use while sorting files,
+      while using SequenceFile.Sorter, in megabytes. By default,
+      gives each merge stream 1MB, which should minimize seeks.
+    </description>
+  </property>
+  <property>
+    <name>seq.io.sort.factor</name>
+    <value>100</value>
+    <description>
+      The number of streams to merge at once while sorting
+      files using SequenceFile.Sorter.
+      This determines the number of open file handles.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.zk.address</name>
+    <!--value>127.0.0.1:2181</value-->
+    <description>Host:Port of the ZooKeeper server to be used.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.zk.num-retries</name>
+    <value>1000</value>
+    <description>Number of tries to connect to ZooKeeper.</description>
+  </property>
+
+  <property>
+    <name>hadoop.zk.retry-interval-ms</name>
+    <value>1000</value>
+    <description>Retry interval in milliseconds when connecting to ZooKeeper.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.zk.timeout-ms</name>
+    <value>10000</value>
+    <description>ZooKeeper session timeout in milliseconds. Session expiration
+      is managed by the ZooKeeper cluster itself, not by the client. This value is
+      used by the cluster to determine when the client's session expires.
+      Expirations happens when the cluster does not hear from the client within
+      the specified session timeout period (i.e. no heartbeat).</description>
+  </property>
+
+  <property>
+    <name>hadoop.zk.acl</name>
+    <value>world:anyone:rwcda</value>
+    <description>ACL's to be used for ZooKeeper znodes.</description>
+  </property>
+
+  <property>
+    <name>hadoop.zk.auth</name>
+    <description>
+      Specify the auths to be used for the ACL's specified in hadoop.zk.acl.
+      This takes a comma-separated list of authentication mechanisms, each of the
+      form 'scheme:auth' (the same syntax used for the 'addAuth' command in
+      the ZK CLI).
+    </description>
+  </property>
+  <property>
+    <name>hadoop.treat.subject.external</name>
+    <value>false</value>
+    <description>
+      When creating UGI with UserGroupInformation(Subject), treat the passed
+      subject external if set to true, and assume the owner of the subject
+      should do the credential renewal.
+
+      When true this property will introduce an incompatible change which
+      may require changes in client code. For more details, see the jiras:
+      HADOOP-13805,HADOOP-13558.
+    </description>
+  </property>
+</configuration>
diff --git a/flink-filesystems/flink-fs-hadoop-shaded/src/test/resources/core-site.xml b/flink-filesystems/flink-fs-hadoop-shaded/src/test/resources/core-site.xml
index 0283de79cf1..bddcdc82fd3 100644
--- a/flink-filesystems/flink-fs-hadoop-shaded/src/test/resources/core-site.xml
+++ b/flink-filesystems/flink-fs-hadoop-shaded/src/test/resources/core-site.xml
@@ -1,2775 +1,31 @@
 <?xml version="1.0"?>
-<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
-
 <!--
-   Licensed to the Apache Software Foundation (ASF) under one or more
-   contributor license agreements.  See the NOTICE file distributed with
-   this work for additional information regarding copyright ownership.
-   The ASF licenses this file to You under the Apache License, Version 2.0
-   (the "License"); you may not use this file except in compliance with
-   the License.  You may obtain a copy of the License at
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
 
        http://www.apache.org/licenses/LICENSE-2.0
 
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
 -->
 
-<!-- Do not modify this file directly.  Instead, copy entries that you -->
-<!-- wish to modify from this file into core-site.xml and change them -->
-<!-- there.  If core-site.xml does not already exist, create it.      -->
+<!--
+A configuration as it may accidentally be in the classpath when Hadoop is
+in the classpath. Used for tests checking that the presence of such a config
+does not pollute the settings.
+-->
 
 <configuration>
-
-  <!--- global properties -->
-
-  <property>
-    <name>hadoop.common.configuration.version</name>
-    <value>3.0.0</value>
-    <description>version of this configuration file</description>
-  </property>
-
-  <property>
-    <name>hadoop.tmp.dir</name>
-    <value>/tmp/hadoop-${user.name}</value>
-    <description>A base for other temporary directories.</description>
-  </property>
-
-  <property>
-    <name>hadoop.http.filter.initializers</name>
-    <value>org.apache.hadoop.http.lib.StaticUserWebFilter</value>
-    <description>A comma separated list of class names. Each class in the list
-      must extend org.apache.hadoop.http.FilterInitializer. The corresponding
-      Filter will be initialized. Then, the Filter will be applied to all user
-      facing jsp and servlet web pages.  The ordering of the list defines the
-      ordering of the filters.</description>
-  </property>
-
-  <!--- security properties -->
-
-  <property>
-    <name>hadoop.security.authorization</name>
-    <value>false</value>
-    <description>Is service-level authorization enabled?</description>
-  </property>
-
-  <property>
-    <name>hadoop.security.instrumentation.requires.admin</name>
-    <value>false</value>
-    <description>
-      Indicates if administrator ACLs are required to access
-      instrumentation servlets (JMX, METRICS, CONF, STACKS).
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.authentication</name>
-    <value>simple</value>
-    <description>Possible values are simple (no authentication), and kerberos
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping</name>
-    <value>org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback</value>
-    <description>
-      Class for user to group mapping (get groups for a given user) for ACL.
-      The default implementation,
-      org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback,
-      will determine if the Java Native Interface (JNI) is available. If JNI is
-      available the implementation will use the API within hadoop to resolve a
-      list of groups for a user. If JNI is not available then the shell
-      implementation, ShellBasedUnixGroupsMapping, is used.  This implementation
-      shells out to the Linux/Unix environment with the
-      <code>bash -c groups</code> command to resolve a list of groups for a user.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.dns.interface</name>
-    <description>
-      The name of the Network Interface from which the service should determine
-      its host name for Kerberos login. e.g. eth2. In a multi-homed environment,
-      the setting can be used to affect the _HOST substitution in the service
-      Kerberos principal. If this configuration value is not set, the service
-      will use its default hostname as returned by
-      InetAddress.getLocalHost().getCanonicalHostName().
-
-      Most clusters will not require this setting.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.dns.nameserver</name>
-    <description>
-      The host name or IP address of the name server (DNS) which a service Node
-      should use to determine its own host name for Kerberos Login. Requires
-      hadoop.security.dns.interface.
-
-      Most clusters will not require this setting.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.dns.log-slow-lookups.enabled</name>
-    <value>false</value>
-    <description>
-      Time name lookups (via SecurityUtil) and log them if they exceed the
-      configured threshold.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.dns.log-slow-lookups.threshold.ms</name>
-    <value>1000</value>
-    <description>
-      If slow lookup logging is enabled, this threshold is used to decide if a
-      lookup is considered slow enough to be logged.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.groups.cache.secs</name>
-    <value>300</value>
-    <description>
-      This is the config controlling the validity of the entries in the cache
-      containing the user->group mapping. When this duration has expired,
-      then the implementation of the group mapping provider is invoked to get
-      the groups of the user and then cached back.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.groups.negative-cache.secs</name>
-    <value>30</value>
-    <description>
-      Expiration time for entries in the the negative user-to-group mapping
-      caching, in seconds. This is useful when invalid users are retrying
-      frequently. It is suggested to set a small value for this expiration, since
-      a transient error in group lookup could temporarily lock out a legitimate
-      user.
-
-      Set this to zero or negative value to disable negative user-to-group caching.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.groups.cache.warn.after.ms</name>
-    <value>5000</value>
-    <description>
-      If looking up a single user to group takes longer than this amount of
-      milliseconds, we will log a warning message.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.groups.cache.background.reload</name>
-    <value>false</value>
-    <description>
-      Whether to reload expired user->group mappings using a background thread
-      pool. If set to true, a pool of
-      hadoop.security.groups.cache.background.reload.threads is created to
-      update the cache in the background.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.groups.cache.background.reload.threads</name>
-    <value>3</value>
-    <description>
-      Only relevant if hadoop.security.groups.cache.background.reload is true.
-      Controls the number of concurrent background user->group cache entry
-      refreshes. Pending refresh requests beyond this value are queued and
-      processed when a thread is free.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.groups.shell.command.timeout</name>
-    <value>0s</value>
-    <description>
-      Used by the ShellBasedUnixGroupsMapping class, this property controls how
-      long to wait for the underlying shell command that is run to fetch groups.
-      Expressed in seconds (e.g. 10s, 1m, etc.), if the running command takes
-      longer than the value configured, the command is aborted and the groups
-      resolver would return a result of no groups found. A value of 0s (default)
-      would mean an infinite wait (i.e. wait until the command exits on its own).
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.connection.timeout.ms</name>
-    <value>60000</value>
-    <description>
-      This property is the connection timeout (in milliseconds) for LDAP
-      operations. If the LDAP provider doesn't establish a connection within the
-      specified period, it will abort the connect attempt. Non-positive value
-      means no LDAP connection timeout is specified in which case it waits for the
-      connection to establish until the underlying network times out.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.read.timeout.ms</name>
-    <value>60000</value>
-    <description>
-      This property is the read timeout (in milliseconds) for LDAP
-      operations. If the LDAP provider doesn't get a LDAP response within the
-      specified period, it will abort the read attempt. Non-positive value
-      means no read timeout is specified in which case it waits for the response
-      infinitely.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.url</name>
-    <value></value>
-    <description>
-      The URL of the LDAP server to use for resolving user groups when using
-      the LdapGroupsMapping user to group mapping.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.ssl</name>
-    <value>false</value>
-    <description>
-      Whether or not to use SSL when connecting to the LDAP server.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.ssl.keystore</name>
-    <value></value>
-    <description>
-      File path to the SSL keystore that contains the SSL certificate required
-      by the LDAP server.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.ssl.keystore.password.file</name>
-    <value></value>
-    <description>
-      The path to a file containing the password of the LDAP SSL keystore. If
-      the password is not configured in credential providers and the property
-      hadoop.security.group.mapping.ldap.ssl.keystore.password is not set,
-      LDAPGroupsMapping reads password from the file.
-
-      IMPORTANT: This file should be readable only by the Unix user running
-      the daemons and should be a local file.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.ssl.keystore.password</name>
-    <value></value>
-    <description>
-      The password of the LDAP SSL keystore. this property name is used as an
-      alias to get the password from credential providers. If the password can
-      not be found and hadoop.security.credential.clear-text-fallback is true
-      LDAPGroupsMapping uses the value of this property for password.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.credential.clear-text-fallback</name>
-    <value>true</value>
-    <description>
-      true or false to indicate whether or not to fall back to storing credential
-      password as clear text. The default value is true. This property only works
-      when the password can't not be found from credential providers.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.credential.provider.path</name>
-    <value></value>
-    <description>
-      A comma-separated list of URLs that indicates the type and
-      location of a list of providers that should be consulted.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.credstore.java-keystore-provider.password-file</name>
-    <value></value>
-    <description>
-      The path to a file containing the custom password for all keystores
-      that may be configured in the provider path.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.bind.user</name>
-    <value></value>
-    <description>
-      The distinguished name of the user to bind as when connecting to the LDAP
-      server. This may be left blank if the LDAP server supports anonymous binds.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.bind.password.file</name>
-    <value></value>
-    <description>
-      The path to a file containing the password of the bind user. If
-      the password is not configured in credential providers and the property
-      hadoop.security.group.mapping.ldap.bind.password is not set,
-      LDAPGroupsMapping reads password from the file.
-
-      IMPORTANT: This file should be readable only by the Unix user running
-      the daemons and should be a local file.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.bind.password</name>
-    <value></value>
-    <description>
-      The password of the bind user. this property name is used as an
-      alias to get the password from credential providers. If the password can
-      not be found and hadoop.security.credential.clear-text-fallback is true
-      LDAPGroupsMapping uses the value of this property for password.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.base</name>
-    <value></value>
-    <description>
-      The search base for the LDAP connection. This is a distinguished name,
-      and will typically be the root of the LDAP directory.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.userbase</name>
-    <value></value>
-    <description>
-      The search base for the LDAP connection for user search query. This is a
-      distinguished name, and its the root of the LDAP directory for users.
-      If not set, hadoop.security.group.mapping.ldap.base is used.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.groupbase</name>
-    <value></value>
-    <description>
-      The search base for the LDAP connection for group search . This is a
-      distinguished name, and its the root of the LDAP directory for groups.
-      If not set, hadoop.security.group.mapping.ldap.base is used.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.search.filter.user</name>
-    <value>(&amp;(objectClass=user)(sAMAccountName={0}))</value>
-    <description>
-      An additional filter to use when searching for LDAP users. The default will
-      usually be appropriate for Active Directory installations. If connecting to
-      an LDAP server with a non-AD schema, this should be replaced with
-      (&amp;(objectClass=inetOrgPerson)(uid={0}). {0} is a special string used to
-      denote where the username fits into the filter.
-
-      If the LDAP server supports posixGroups, Hadoop can enable the feature by
-      setting the value of this property to "posixAccount" and the value of
-      the hadoop.security.group.mapping.ldap.search.filter.group property to
-      "posixGroup".
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.search.filter.group</name>
-    <value>(objectClass=group)</value>
-    <description>
-      An additional filter to use when searching for LDAP groups. This should be
-      changed when resolving groups against a non-Active Directory installation.
-
-      See the description of hadoop.security.group.mapping.ldap.search.filter.user
-      to enable posixGroups support.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.search.attr.memberof</name>
-    <value></value>
-    <description>
-      The attribute of the user object that identifies its group objects. By
-      default, Hadoop makes two LDAP queries per user if this value is empty. If
-      set, Hadoop will attempt to resolve group names from this attribute,
-      instead of making the second LDAP query to get group objects. The value
-      should be 'memberOf' for an MS AD installation.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.search.attr.member</name>
-    <value>member</value>
-    <description>
-      The attribute of the group object that identifies the users that are
-      members of the group. The default will usually be appropriate for
-      any LDAP installation.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.search.attr.group.name</name>
-    <value>cn</value>
-    <description>
-      The attribute of the group object that identifies the group name. The
-      default will usually be appropriate for all LDAP systems.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.search.group.hierarchy.levels</name>
-    <value>0</value>
-    <description>
-      The number of levels to go up the group hierarchy when determining
-      which groups a user is part of. 0 Will represent checking just the
-      group that the user belongs to.  Each additional level will raise the
-      time it takes to execute a query by at most
-      hadoop.security.group.mapping.ldap.directory.search.timeout.
-      The default will usually be appropriate for all LDAP systems.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.posix.attr.uid.name</name>
-    <value>uidNumber</value>
-    <description>
-      The attribute of posixAccount to use when groups for membership.
-      Mostly useful for schemas wherein groups have memberUids that use an
-      attribute other than uidNumber.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.posix.attr.gid.name</name>
-    <value>gidNumber</value>
-    <description>
-      The attribute of posixAccount indicating the group id.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.ldap.directory.search.timeout</name>
-    <value>10000</value>
-    <description>
-      The attribute applied to the LDAP SearchControl properties to set a
-      maximum time limit when searching and awaiting a result.
-      Set to 0 if infinite wait period is desired.
-      Default is 10 seconds. Units in milliseconds.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.providers</name>
-    <value></value>
-    <description>
-      Comma separated of names of other providers to provide user to group
-      mapping. Used by CompositeGroupsMapping.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.group.mapping.providers.combined</name>
-    <value>true</value>
-    <description>
-      true or false to indicate whether groups from the providers are combined or
-      not. The default value is true. If true, then all the providers will be
-      tried to get groups and all the groups are combined to return as the final
-      results. Otherwise, providers are tried one by one in the configured list
-      order, and if any groups are retrieved from any provider, then the groups
-      will be returned without trying the left ones.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.service.user.name.key</name>
-    <value></value>
-    <description>
-      For those cases where the same RPC protocol is implemented by multiple
-      servers, this configuration is required for specifying the principal
-      name to use for the service when the client wishes to make an RPC call.
-    </description>
-  </property>
-  <property>
-    <name>fs.azure.user.agent.prefix</name>
-    <value>unknown</value>
-    <description>
-      WASB passes User-Agent header to the Azure back-end. The default value
-      contains WASB version, Java Runtime version, Azure Client library version,
-      and the value of the configuration option fs.azure.user.agent.prefix.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.uid.cache.secs</name>
-    <value>14400</value>
-    <description>
-      This is the config controlling the validity of the entries in the cache
-      containing the userId to userName and groupId to groupName used by
-      NativeIO getFstat().
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.rpc.protection</name>
-    <value>authentication</value>
-    <description>A comma-separated list of protection values for secured sasl
-      connections. Possible values are authentication, integrity and privacy.
-      authentication means authentication only and no integrity or privacy;
-      integrity implies authentication and integrity are enabled; and privacy
-      implies all of authentication, integrity and privacy are enabled.
-      hadoop.security.saslproperties.resolver.class can be used to override
-      the hadoop.rpc.protection for a connection at the server side.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.saslproperties.resolver.class</name>
-    <value></value>
-    <description>SaslPropertiesResolver used to resolve the QOP used for a
-      connection. If not specified, the full set of values specified in
-      hadoop.rpc.protection is used while determining the QOP used for the
-      connection. If a class is specified, then the QOP values returned by
-      the class will be used while determining the QOP used for the connection.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.sensitive-config-keys</name>
-    <value>
-      secret$
-      password$
-      ssl.keystore.pass$
-      fs.s3.*[Ss]ecret.?[Kk]ey
-      fs.s3a.*.server-side-encryption.key
-      fs.azure.account.key.*
-      credential$
-      oauth.*token$
-      hadoop.security.sensitive-config-keys
-    </value>
-    <description>A comma-separated or multi-line list of regular expressions to
-      match configuration keys that should be redacted where appropriate, for
-      example, when logging modified properties during a reconfiguration,
-      private credentials should not be logged.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.workaround.non.threadsafe.getpwuid</name>
-    <value>true</value>
-    <description>Some operating systems or authentication modules are known to
-      have broken implementations of getpwuid_r and getpwgid_r, such that these
-      calls are not thread-safe. Symptoms of this problem include JVM crashes
-      with a stack trace inside these functions. If your system exhibits this
-      issue, enable this configuration parameter to include a lock around the
-      calls as a workaround.
-
-      An incomplete list of some systems known to have this issue is available
-      at http://wiki.apache.org/hadoop/KnownBrokenPwuidImplementations
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.kerberos.kinit.command</name>
-    <value>kinit</value>
-    <description>Used to periodically renew Kerberos credentials when provided
-      to Hadoop. The default setting assumes that kinit is in the PATH of users
-      running the Hadoop client. Change this to the absolute path to kinit if this
-      is not the case.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.kerberos.min.seconds.before.relogin</name>
-    <value>60</value>
-    <description>The minimum time between relogin attempts for Kerberos, in
-      seconds.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.auth_to_local</name>
-    <value></value>
-    <description>Maps kerberos principals to local user names</description>
-  </property>
-
-  <property>
-    <name>hadoop.token.files</name>
-    <value></value>
-    <description>List of token cache files that have delegation tokens for hadoop service</description>
-  </property>
-
-  <!-- i/o properties -->
-  <property>
-    <name>io.file.buffer.size</name>
-    <value>4096</value>
-    <description>The size of buffer for use in sequence files.
-      The size of this buffer should probably be a multiple of hardware
-      page size (4096 on Intel x86), and it determines how much data is
-      buffered during read and write operations.</description>
-  </property>
-
-  <property>
-    <name>io.bytes.per.checksum</name>
-    <value>512</value>
-    <description>The number of bytes per checksum.  Must not be larger than
-      io.file.buffer.size.</description>
-  </property>
-
-  <property>
-    <name>io.skip.checksum.errors</name>
-    <value>false</value>
-    <description>If true, when a checksum error is encountered while
-      reading a sequence file, entries are skipped, instead of throwing an
-      exception.</description>
-  </property>
-
-  <property>
-    <name>io.compression.codecs</name>
-    <value></value>
-    <description>A comma-separated list of the compression codec classes that can
-      be used for compression/decompression. In addition to any classes specified
-      with this property (which take precedence), codec classes on the classpath
-      are discovered using a Java ServiceLoader.</description>
-  </property>
-
-  <property>
-    <name>io.compression.codec.bzip2.library</name>
-    <value>system-native</value>
-    <description>The native-code library to be used for compression and
-      decompression by the bzip2 codec.  This library could be specified
-      either by by name or the full pathname.  In the former case, the
-      library is located by the dynamic linker, usually searching the
-      directories specified in the environment variable LD_LIBRARY_PATH.
-
-      The value of "system-native" indicates that the default system
-      library should be used.  To indicate that the algorithm should
-      operate entirely in Java, specify "java-builtin".</description>
-  </property>
-
-  <property>
-    <name>io.serializations</name>
-    <value>org.apache.hadoop.io.serializer.WritableSerialization, org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization, org.apache.hadoop.io.serializer.avro.AvroReflectSerialization</value>
-    <description>A list of serialization classes that can be used for
-      obtaining serializers and deserializers.</description>
-  </property>
-
-  <property>
-    <name>io.seqfile.local.dir</name>
-    <value>${hadoop.tmp.dir}/io/local</value>
-    <description>The local directory where sequence file stores intermediate
-      data files during merge.  May be a comma-separated list of
-      directories on different devices in order to spread disk i/o.
-      Directories that do not exist are ignored.
-    </description>
-  </property>
-
-  <property>
-    <name>io.map.index.skip</name>
-    <value>0</value>
-    <description>Number of index entries to skip between each entry.
-      Zero by default. Setting this to values larger than zero can
-      facilitate opening large MapFiles using less memory.</description>
-  </property>
-
-  <property>
-    <name>io.map.index.interval</name>
-    <value>128</value>
-    <description>
-      MapFile consist of two files - data file (tuples) and index file
-      (keys). For every io.map.index.interval records written in the
-      data file, an entry (record-key, data-file-position) is written
-      in the index file. This is to allow for doing binary search later
-      within the index file to look up records by their keys and get their
-      closest positions in the data file.
-    </description>
-  </property>
-
-  <property>
-    <name>io.erasurecode.codec.rs.rawcoders</name>
-    <value>rs_native,rs_java</value>
-    <description>
-      Comma separated raw coder implementations for the rs codec. The earlier
-      factory is prior to followings in case of failure of creating raw coders.
-    </description>
-  </property>
-
-  <property>
-    <name>io.erasurecode.codec.rs-legacy.rawcoders</name>
-    <value>rs-legacy_java</value>
-    <description>
-      Comma separated raw coder implementations for the rs-legacy codec. The earlier
-      factory is prior to followings in case of failure of creating raw coders.
-    </description>
-  </property>
-
-  <property>
-    <name>io.erasurecode.codec.xor.rawcoders</name>
-    <value>xor_native,xor_java</value>
-    <description>
-      Comma separated raw coder implementations for the xor codec. The earlier
-      factory is prior to followings in case of failure of creating raw coders.
-    </description>
-  </property>
-
-  <!-- file system properties -->
-
-  <property>
-    <name>fs.defaultFS</name>
-    <value>file:///</value>
-    <description>The name of the default file system.  A URI whose
-      scheme and authority determine the FileSystem implementation.  The
-      uri's scheme determines the config property (fs.SCHEME.impl) naming
-      the FileSystem implementation class.  The uri's authority is used to
-      determine the host, port, etc. for a filesystem.</description>
-  </property>
-
-  <property>
-    <name>fs.default.name</name>
-    <value>file:///</value>
-    <description>Deprecated. Use (fs.defaultFS) property
-      instead</description>
-  </property>
-
-  <property>
-    <name>fs.trash.interval</name>
-    <value>0</value>
-    <description>Number of minutes after which the checkpoint
-      gets deleted.  If zero, the trash feature is disabled.
-      This option may be configured both on the server and the
-      client. If trash is disabled server side then the client
-      side configuration is checked. If trash is enabled on the
-      server side then the value configured on the server is
-      used and the client configuration value is ignored.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.trash.checkpoint.interval</name>
-    <value>0</value>
-    <description>Number of minutes between trash checkpoints.
-      Should be smaller or equal to fs.trash.interval. If zero,
-      the value is set to the value of fs.trash.interval.
-      Every time the checkpointer runs it creates a new checkpoint
-      out of current and removes checkpoints created more than
-      fs.trash.interval minutes ago.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.protected.directories</name>
-    <value></value>
-    <description>A comma-separated list of directories which cannot
-      be deleted even by the superuser unless they are empty. This
-      setting can be used to guard important system directories
-      against accidental deletion due to administrator error.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.file.impl</name>
-    <value>org.apache.hadoop.fs.local.LocalFs</value>
-    <description>The AbstractFileSystem for file: uris.</description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.har.impl</name>
-    <value>org.apache.hadoop.fs.HarFs</value>
-    <description>The AbstractFileSystem for har: uris.</description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.hdfs.impl</name>
-    <value>org.apache.hadoop.fs.Hdfs</value>
-    <description>The FileSystem for hdfs: uris.</description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.viewfs.impl</name>
-    <value>org.apache.hadoop.fs.viewfs.ViewFs</value>
-    <description>The AbstractFileSystem for view file system for viewfs: uris
-      (ie client side mount table:).</description>
-  </property>
-
-  <property>
-    <name>fs.viewfs.rename.strategy</name>
-    <value>SAME_MOUNTPOINT</value>
-    <description>Allowed rename strategy to rename between multiple mountpoints.
-      Allowed values are SAME_MOUNTPOINT,SAME_TARGET_URI_ACROSS_MOUNTPOINT and
-      SAME_FILESYSTEM_ACROSS_MOUNTPOINT.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.ftp.impl</name>
-    <value>org.apache.hadoop.fs.ftp.FtpFs</value>
-    <description>The FileSystem for Ftp: uris.</description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.webhdfs.impl</name>
-    <value>org.apache.hadoop.fs.WebHdfs</value>
-    <description>The FileSystem for webhdfs: uris.</description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.swebhdfs.impl</name>
-    <value>org.apache.hadoop.fs.SWebHdfs</value>
-    <description>The FileSystem for swebhdfs: uris.</description>
-  </property>
-
-  <property>
-    <name>fs.ftp.host</name>
-    <value>0.0.0.0</value>
-    <description>FTP filesystem connects to this server</description>
-  </property>
-
-  <property>
-    <name>fs.ftp.host.port</name>
-    <value>21</value>
-    <description>
-      FTP filesystem connects to fs.ftp.host on this port
-    </description>
-  </property>
-
-  <property>
-    <name>fs.ftp.data.connection.mode</name>
-    <value>ACTIVE_LOCAL_DATA_CONNECTION_MODE</value>
-    <description>Set the FTPClient's data connection mode based on configuration.
-      Valid values are ACTIVE_LOCAL_DATA_CONNECTION_MODE,
-      PASSIVE_LOCAL_DATA_CONNECTION_MODE and PASSIVE_REMOTE_DATA_CONNECTION_MODE.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.ftp.transfer.mode</name>
-    <value>BLOCK_TRANSFER_MODE</value>
-    <description>
-      Set FTP's transfer mode based on configuration. Valid values are
-      STREAM_TRANSFER_MODE, BLOCK_TRANSFER_MODE and COMPRESSED_TRANSFER_MODE.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.df.interval</name>
-    <value>60000</value>
-    <description>Disk usage statistics refresh interval in msec.</description>
-  </property>
-
-  <property>
-    <name>fs.du.interval</name>
-    <value>600000</value>
-    <description>File space usage statistics refresh interval in msec.</description>
-  </property>
-
-  <property>
-    <name>fs.swift.impl</name>
-    <value>org.apache.hadoop.fs.swift.snative.SwiftNativeFileSystem</value>
-    <description>The implementation class of the OpenStack Swift Filesystem</description>
-  </property>
-
-  <property>
-    <name>fs.automatic.close</name>
-    <value>true</value>
-    <description>By default, FileSystem instances are automatically closed at program
-      exit using a JVM shutdown hook. Setting this property to false disables this
-      behavior. This is an advanced option that should only be used by server applications
-      requiring a more carefully orchestrated shutdown sequence.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.access.key</name>
-    <description>AWS access key ID used by S3A file system. Omit for IAM role-based or provider-based authentication.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.secret.key</name>
-    <description>AWS secret key used by S3A file system. Omit for IAM role-based or provider-based authentication.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.aws.credentials.provider</name>
-    <description>
-      Comma-separated class names of credential provider classes which implement
-      com.amazonaws.auth.AWSCredentialsProvider.
-
-      These are loaded and queried in sequence for a valid set of credentials.
-      Each listed class must implement one of the following means of
-      construction, which are attempted in order:
-      1. a public constructor accepting java.net.URI and
-      org.apache.hadoop.conf.Configuration,
-      2. a public static method named getInstance that accepts no
-      arguments and returns an instance of
-      com.amazonaws.auth.AWSCredentialsProvider, or
-      3. a public default constructor.
-
-      Specifying org.apache.hadoop.fs.s3a.AnonymousAWSCredentialsProvider allows
-      anonymous access to a publicly accessible S3 bucket without any credentials.
-      Please note that allowing anonymous access to an S3 bucket compromises
-      security and therefore is unsuitable for most use cases. It can be useful
-      for accessing public data sets without requiring AWS credentials.
-
-      If unspecified, then the default list of credential provider classes,
-      queried in sequence, is:
-      1. org.apache.hadoop.fs.s3a.BasicAWSCredentialsProvider: supports static
-      configuration of AWS access key ID and secret access key.  See also
-      fs.s3a.access.key and fs.s3a.secret.key.
-      2. com.amazonaws.auth.EnvironmentVariableCredentialsProvider: supports
-      configuration of AWS access key ID and secret access key in
-      environment variables named AWS_ACCESS_KEY_ID and
-      AWS_SECRET_ACCESS_KEY, as documented in the AWS SDK.
-      3. com.amazonaws.auth.InstanceProfileCredentialsProvider: supports use
-      of instance profile credentials if running in an EC2 VM.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.session.token</name>
-    <description>Session token, when using org.apache.hadoop.fs.s3a.TemporaryAWSCredentialsProvider
-      as one of the providers.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.security.credential.provider.path</name>
-    <value />
-    <description>
-      Optional comma separated list of credential providers, a list
-      which is prepended to that set in hadoop.security.credential.provider.path
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.connection.maximum</name>
-    <value>15</value>
-    <description>Controls the maximum number of simultaneous connections to S3.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.connection.ssl.enabled</name>
-    <value>true</value>
-    <description>Enables or disables SSL connections to S3.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.endpoint</name>
-    <description>AWS S3 endpoint to connect to. An up-to-date list is
-      provided in the AWS Documentation: regions and endpoints. Without this
-      property, the standard region (s3.amazonaws.com) is assumed.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.path.style.access</name>
-    <value>false</value>
-    <description>Enable S3 path style access ie disabling the default virtual hosting behaviour.
-      Useful for S3A-compliant storage providers as it removes the need to set up DNS for virtual hosting.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.proxy.host</name>
-    <description>Hostname of the (optional) proxy server for S3 connections.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.proxy.port</name>
-    <description>Proxy server port. If this property is not set
-      but fs.s3a.proxy.host is, port 80 or 443 is assumed (consistent with
-      the value of fs.s3a.connection.ssl.enabled).</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.proxy.username</name>
-    <description>Username for authenticating with proxy server.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.proxy.password</name>
-    <description>Password for authenticating with proxy server.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.proxy.domain</name>
-    <description>Domain for authenticating with proxy server.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.proxy.workstation</name>
-    <description>Workstation for authenticating with proxy server.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.attempts.maximum</name>
-    <value>20</value>
-    <description>How many times we should retry commands on transient errors.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.connection.establish.timeout</name>
-    <value>5000</value>
-    <description>Socket connection setup timeout in milliseconds.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.connection.timeout</name>
-    <value>200000</value>
-    <description>Socket connection timeout in milliseconds.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.socket.send.buffer</name>
-    <value>8192</value>
-    <description>Socket send buffer hint to amazon connector. Represented in bytes.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.socket.recv.buffer</name>
-    <value>8192</value>
-    <description>Socket receive buffer hint to amazon connector. Represented in bytes.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.paging.maximum</name>
-    <value>5000</value>
-    <description>How many keys to request from S3 when doing
-      directory listings at a time.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.threads.max</name>
-    <value>10</value>
-    <description>The total number of threads available in the filesystem for data
-      uploads *or any other queued filesystem operation*.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.threads.keepalivetime</name>
-    <value>60</value>
-    <description>Number of seconds a thread can be idle before being
-      terminated.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.max.total.tasks</name>
-    <value>5</value>
-    <description>The number of operations which can be queued for execution</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.multipart.size</name>
-    <value>100M</value>
-    <description>How big (in bytes) to split upload or copy operations up into.
-      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.multipart.threshold</name>
-    <value>2147483647</value>
-    <description>How big (in bytes) to split upload or copy operations up into.
-      This also controls the partition size in renamed files, as rename() involves
-      copying the source file(s).
-      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.multiobjectdelete.enable</name>
-    <value>true</value>
-    <description>When enabled, multiple single-object delete requests are replaced by
-      a single 'delete multiple objects'-request, reducing the number of requests.
-      Beware: legacy S3-compatible object stores might not support this request.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.acl.default</name>
-    <description>Set a canned ACL for newly created and copied objects. Value may be Private,
-      PublicRead, PublicReadWrite, AuthenticatedRead, LogDeliveryWrite, BucketOwnerRead,
-      or BucketOwnerFullControl.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.multipart.purge</name>
-    <value>false</value>
-    <description>True if you want to purge existing multipart uploads that may not have been
-      completed/aborted correctly. The corresponding purge age is defined in
-      fs.s3a.multipart.purge.age.
-      If set, when the filesystem is instantiated then all outstanding uploads
-      older than the purge age will be terminated -across the entire bucket.
-      This will impact multipart uploads by other applications and users. so should
-      be used sparingly, with an age value chosen to stop failed uploads, without
-      breaking ongoing operations.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.multipart.purge.age</name>
-    <value>86400</value>
-    <description>Minimum age in seconds of multipart uploads to purge.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.server-side-encryption-algorithm</name>
-    <description>Specify a server-side encryption algorithm for s3a: file system.
-      Unset by default.  It supports the following values: 'AES256' (for SSE-S3),
-      'SSE-KMS' and 'SSE-C'.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.server-side-encryption.key</name>
-    <description>Specific encryption key to use if fs.s3a.server-side-encryption-algorithm
-      has been set to 'SSE-KMS' or 'SSE-C'. In the case of SSE-C, the value of this property
-      should be the Base64 encoded key. If you are using SSE-KMS and leave this property empty,
-      you'll be using your default's S3 KMS key, otherwise you should set this property to
-      the specific KMS key id.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.signing-algorithm</name>
-    <description>Override the default signing algorithm so legacy
-      implementations can still be used</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.block.size</name>
-    <value>32M</value>
-    <description>Block size to use when reading files using s3a: file system.
-      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.buffer.dir</name>
-    <value>${hadoop.tmp.dir}/s3a</value>
-    <description>Comma separated list of directories that will be used to buffer file
-      uploads to.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.fast.upload.buffer</name>
-    <value>disk</value>
-    <description>
-      The buffering mechanism to for data being written.
-      Values: disk, array, bytebuffer.
-
-      "disk" will use the directories listed in fs.s3a.buffer.dir as
-      the location(s) to save data prior to being uploaded.
-
-      "array" uses arrays in the JVM heap
-
-      "bytebuffer" uses off-heap memory within the JVM.
-
-      Both "array" and "bytebuffer" will consume memory in a single stream up to the number
-      of blocks set by:
-
-      fs.s3a.multipart.size * fs.s3a.fast.upload.active.blocks.
-
-      If using either of these mechanisms, keep this value low
-
-      The total number of threads performing work across all threads is set by
-      fs.s3a.threads.max, with fs.s3a.max.total.tasks values setting the number of queued
-      work items.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.fast.upload.active.blocks</name>
-    <value>4</value>
-    <description>
-      Maximum Number of blocks a single output stream can have
-      active (uploading, or queued to the central FileSystem
-      instance's pool of queued operations.
-
-      This stops a single stream overloading the shared thread pool.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.readahead.range</name>
-    <value>64K</value>
-    <description>Bytes to read ahead during a seek() before closing and
-      re-opening the S3 HTTP connection. This option will be overridden if
-      any call to setReadahead() is made to an open stream.
-      A suffix from the set {K,M,G,T,P} may be used to scale the numeric value.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.user.agent.prefix</name>
-    <value></value>
-    <description>
-      Sets a custom value that will be prepended to the User-Agent header sent in
-      HTTP requests to the S3 back-end by S3AFileSystem.  The User-Agent header
-      always includes the Hadoop version number followed by a string generated by
-      the AWS SDK.  An example is "User-Agent: Hadoop 2.8.0, aws-sdk-java/1.10.6".
-      If this optional property is set, then its value is prepended to create a
-      customized User-Agent.  For example, if this configuration property was set
-      to "MyApp", then an example of the resulting User-Agent would be
-      "User-Agent: MyApp, Hadoop 2.8.0, aws-sdk-java/1.10.6".
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.metadatastore.authoritative</name>
-    <value>false</value>
-    <description>
-      When true, allow MetadataStore implementations to act as source of
-      truth for getting file status and directory listings.  Even if this
-      is set to true, MetadataStore implementations may choose not to
-      return authoritative results.  If the configured MetadataStore does
-      not support being authoritative, this setting will have no effect.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.metadatastore.impl</name>
-    <value>org.apache.hadoop.fs.s3a.s3guard.NullMetadataStore</value>
-    <description>
-      Fully-qualified name of the class that implements the MetadataStore
-      to be used by s3a.  The default class, NullMetadataStore, has no
-      effect: s3a will continue to treat the backing S3 service as the one
-      and only source of truth for file and directory metadata.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.cli.prune.age</name>
-    <value>86400000</value>
-    <description>
-      Default age (in milliseconds) after which to prune metadata from the
-      metadatastore when the prune command is run.  Can be overridden on the
-      command-line.
-    </description>
-  </property>
-
-
-  <property>
-    <name>fs.s3a.impl</name>
-    <value>org.apache.hadoop.fs.s3a.S3AFileSystem</value>
-    <description>The implementation class of the S3A Filesystem</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.ddb.region</name>
-    <value></value>
-    <description>
-      AWS DynamoDB region to connect to. An up-to-date list is
-      provided in the AWS Documentation: regions and endpoints. Without this
-      property, the S3Guard will operate table in the associated S3 bucket region.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.ddb.table</name>
-    <value></value>
-    <description>
-      The DynamoDB table name to operate. Without this property, the respective
-      S3 bucket name will be used.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.ddb.table.create</name>
-    <value>false</value>
-    <description>
-      If true, the S3A client will create the table if it does not already exist.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.ddb.table.capacity.read</name>
-    <value>500</value>
-    <description>
-      Provisioned throughput requirements for read operations in terms of capacity
-      units for the DynamoDB table.  This config value will only be used when
-      creating a new DynamoDB table, though later you can manually provision by
-      increasing or decreasing read capacity as needed for existing tables.
-      See DynamoDB documents for more information.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.ddb.table.capacity.write</name>
-    <value>100</value>
-    <description>
-      Provisioned throughput requirements for write operations in terms of
-      capacity units for the DynamoDB table.  Refer to related config
-      fs.s3a.s3guard.ddb.table.capacity.read before usage.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.ddb.max.retries</name>
-    <value>9</value>
-    <description>
-      Max retries on batched DynamoDB operations before giving up and
-      throwing an IOException.  Each retry is delayed with an exponential
-      backoff timer which starts at 100 milliseconds and approximately
-      doubles each time.  The minimum wait before throwing an exception is
-      sum(100, 200, 400, 800, .. 100*2^N-1 ) == 100 * ((2^N)-1)
-      So N = 9 yields at least 51.1 seconds (51,100) milliseconds of blocking
-      before throwing an IOException.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.s3a.s3guard.ddb.background.sleep</name>
-    <value>25</value>
-    <description>
-      Length (in milliseconds) of pause between each batch of deletes when
-      pruning metadata.  Prevents prune operations (which can typically be low
-      priority background operations) from overly interfering with other I/O
-      operations.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.s3a.impl</name>
-    <value>org.apache.hadoop.fs.s3a.S3A</value>
-    <description>The implementation class of the S3A AbstractFileSystem.</description>
-  </property>
-
-  <property>
-    <name>fs.s3a.list.version</name>
-    <value>2</value>
-    <description>
-      Select which version of the S3 SDK's List Objects API to use.  Currently
-      support 2 (default) and 1 (older API).
-    </description>
-  </property>
-
-  <!-- Azure file system properties -->
-  <property>
-    <name>fs.wasb.impl</name>
-    <value>org.apache.hadoop.fs.azure.NativeAzureFileSystem</value>
-    <description>The implementation class of the Native Azure Filesystem</description>
-  </property>
-
-  <property>
-    <name>fs.wasbs.impl</name>
-    <value>org.apache.hadoop.fs.azure.NativeAzureFileSystem$Secure</value>
-    <description>The implementation class of the Secure Native Azure Filesystem</description>
-  </property>
-
-  <property>
-    <name>fs.azure.secure.mode</name>
-    <value>false</value>
-    <description>
-      Config flag to identify the mode in which fs.azure.NativeAzureFileSystem needs
-      to run under. Setting it "true" would make fs.azure.NativeAzureFileSystem use
-      SAS keys to communicate with Azure storage.
-    </description>
-  </property>
-  <property>
-    <name>fs.azure.local.sas.key.mode</name>
-    <value>false</value>
-    <description>
-      Works in conjuction with fs.azure.secure.mode. Setting this config to true
-      results in fs.azure.NativeAzureFileSystem using the local SAS key generation
-      where the SAS keys are generating in the same process as fs.azure.NativeAzureFileSystem.
-      If fs.azure.secure.mode flag is set to false, this flag has no effect.
-    </description>
-  </property>
-  <property>
-    <name>fs.azure.sas.expiry.period</name>
-    <value>90d</value>
-    <description>
-      The default value to be used for expiration period for SAS keys generated.
-      Can use the following suffix (case insensitive):
-      ms(millis), s(sec), m(min), h(hour), d(day)
-      to specify the time (such as 2s, 2m, 1h, etc.).
-    </description>
-  </property>
-  <property>
-    <name>fs.azure.authorization</name>
-    <value>false</value>
-    <description>
-      Config flag to enable authorization support in WASB. Setting it to "true" enables
-      authorization support to WASB. Currently WASB authorization requires a remote service
-      to provide authorization that needs to be specified via fs.azure.authorization.remote.service.url
-      configuration
-    </description>
-  </property>
-  <property>
-    <name>fs.azure.authorization.caching.enable</name>
-    <value>true</value>
-    <description>
-      Config flag to enable caching of authorization results and saskeys in WASB.
-      This flag is relevant only when fs.azure.authorization is enabled.
-    </description>
-  </property>
-  <property>
-    <name>fs.azure.saskey.usecontainersaskeyforallaccess</name>
-    <value>true</value>
-    <description>
-      Use container saskey for access to all blobs within the container.
-      Blob-specific saskeys are not used when this setting is enabled.
-      This setting provides better performance compared to blob-specific saskeys.
-    </description>
-  </property>
-  <property>
-    <name>io.seqfile.compress.blocksize</name>
-    <value>1000000</value>
-    <description>The minimum block size for compression in block compressed
-      SequenceFiles.
-    </description>
-  </property>
-
-  <property>
-    <name>io.mapfile.bloom.size</name>
-    <value>1048576</value>
-    <description>The size of BloomFilter-s used in BloomMapFile. Each time this many
-      keys is appended the next BloomFilter will be created (inside a DynamicBloomFilter).
-      Larger values minimize the number of filters, which slightly increases the performance,
-      but may waste too much space if the total number of keys is usually much smaller
-      than this number.
-    </description>
-  </property>
-
-  <property>
-    <name>io.mapfile.bloom.error.rate</name>
-    <value>0.005</value>
-    <description>The rate of false positives in BloomFilter-s used in BloomMapFile.
-      As this value decreases, the size of BloomFilter-s increases exponentially. This
-      value is the probability of encountering false positives (default is 0.5%).
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.util.hash.type</name>
-    <value>murmur</value>
-    <description>The default implementation of Hash. Currently this can take one of the
-      two values: 'murmur' to select MurmurHash and 'jenkins' to select JenkinsHash.
-    </description>
-  </property>
-
-
-  <!-- ipc properties -->
-
-  <property>
-    <name>ipc.client.idlethreshold</name>
-    <value>4000</value>
-    <description>Defines the threshold number of connections after which
-      connections will be inspected for idleness.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.kill.max</name>
-    <value>10</value>
-    <description>Defines the maximum number of clients to disconnect in one go.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.connection.maxidletime</name>
-    <value>10000</value>
-    <description>The maximum time in msec after which a client will bring down the
-      connection to the server.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.connect.max.retries</name>
-    <value>10</value>
-    <description>Indicates the number of retries a client will make to establish
-      a server connection.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.connect.retry.interval</name>
-    <value>1000</value>
-    <description>Indicates the number of milliseconds a client will wait for
-      before retrying to establish a server connection.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.connect.timeout</name>
-    <value>20000</value>
-    <description>Indicates the number of milliseconds a client will wait for the
-      socket to establish a server connection.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.connect.max.retries.on.timeouts</name>
-    <value>45</value>
-    <description>Indicates the number of retries a client will make on socket timeout
-      to establish a server connection.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.tcpnodelay</name>
-    <value>true</value>
-    <description>Use TCP_NODELAY flag to bypass Nagle's algorithm transmission delays.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.low-latency</name>
-    <value>false</value>
-    <description>Use low-latency QoS markers for IPC connections.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.ping</name>
-    <value>true</value>
-    <description>Send a ping to the server when timeout on reading the response,
-      if set to true. If no failure is detected, the client retries until at least
-      a byte is read or the time given by ipc.client.rpc-timeout.ms is passed.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.ping.interval</name>
-    <value>60000</value>
-    <description>Timeout on waiting response from server, in milliseconds.
-      The client will send ping when the interval is passed without receiving bytes,
-      if ipc.client.ping is set to true.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.rpc-timeout.ms</name>
-    <value>0</value>
-    <description>Timeout on waiting response from server, in milliseconds.
-      If ipc.client.ping is set to true and this rpc-timeout is greater than
-      the value of ipc.ping.interval, the effective value of the rpc-timeout is
-      rounded up to multiple of ipc.ping.interval.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.server.listen.queue.size</name>
-    <value>128</value>
-    <description>Indicates the length of the listen queue for servers accepting
-      client connections.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.server.log.slow.rpc</name>
-    <value>false</value>
-    <description>This setting is useful to troubleshoot performance issues for
-      various services. If this value is set to true then we log requests that
-      fall into 99th percentile as well as increment RpcSlowCalls counter.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.maximum.data.length</name>
-    <value>67108864</value>
-    <description>This indicates the maximum IPC message length (bytes) that can be
-      accepted by the server. Messages larger than this value are rejected by the
-      immediately to avoid possible OOMs. This setting should rarely need to be
-      changed.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.maximum.response.length</name>
-    <value>134217728</value>
-    <description>This indicates the maximum IPC message length (bytes) that can be
-      accepted by the client. Messages larger than this value are rejected
-      immediately to avoid possible OOMs. This setting should rarely need to be
-      changed.  Set to 0 to disable.
-    </description>
-  </property>
-
-  <!-- Proxy Configuration -->
-
-  <property>
-    <name>hadoop.security.impersonation.provider.class</name>
-    <value></value>
-    <description>A class which implements ImpersonationProvider interface, used to
-      authorize whether one user can impersonate a specific user.
-      If not specified, the DefaultImpersonationProvider will be used.
-      If a class is specified, then that class will be used to determine
-      the impersonation capability.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.rpc.socket.factory.class.default</name>
-    <value>org.apache.hadoop.net.StandardSocketFactory</value>
-    <description> Default SocketFactory to use. This parameter is expected to be
-      formatted as "package.FactoryClassName".
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.rpc.socket.factory.class.ClientProtocol</name>
-    <value></value>
-    <description> SocketFactory to use to connect to a DFS. If null or empty, use
-      hadoop.rpc.socket.class.default. This socket factory is also used by
-      DFSClient to create sockets to DataNodes.
-    </description>
-  </property>
-
-
-
-  <property>
-    <name>hadoop.socks.server</name>
-    <value></value>
-    <description> Address (host:port) of the SOCKS server to be used by the
-      SocksSocketFactory.
-    </description>
-  </property>
-
-  <!-- Topology Configuration -->
-  <property>
-    <name>net.topology.node.switch.mapping.impl</name>
-    <value>org.apache.hadoop.net.ScriptBasedMapping</value>
-    <description> The default implementation of the DNSToSwitchMapping. It
-      invokes a script specified in net.topology.script.file.name to resolve
-      node names. If the value for net.topology.script.file.name is not set, the
-      default value of DEFAULT_RACK is returned for all node names.
-    </description>
-  </property>
-
-  <property>
-    <name>net.topology.impl</name>
-    <value>org.apache.hadoop.net.NetworkTopology</value>
-    <description> The default implementation of NetworkTopology which is classic three layer one.
-    </description>
-  </property>
-
-  <property>
-    <name>net.topology.script.file.name</name>
-    <value></value>
-    <description> The script name that should be invoked to resolve DNS names to
-      NetworkTopology names. Example: the script would take host.foo.bar as an
-      argument, and return /rack1 as the output.
-    </description>
-  </property>
-
-  <property>
-    <name>net.topology.script.number.args</name>
-    <value>100</value>
-    <description> The max number of args that the script configured with
-      net.topology.script.file.name should be run with. Each arg is an
-      IP address.
-    </description>
-  </property>
-
-  <property>
-    <name>net.topology.table.file.name</name>
-    <value></value>
-    <description> The file name for a topology file, which is used when the
-      net.topology.node.switch.mapping.impl property is set to
-      org.apache.hadoop.net.TableMapping. The file format is a two column text
-      file, with columns separated by whitespace. The first column is a DNS or
-      IP address and the second column specifies the rack where the address maps.
-      If no entry corresponding to a host in the cluster is found, then
-      /default-rack is assumed.
-    </description>
-  </property>
-
-  <!-- Local file system -->
-  <property>
-    <name>file.stream-buffer-size</name>
-    <value>4096</value>
-    <description>The size of buffer to stream files.
-      The size of this buffer should probably be a multiple of hardware
-      page size (4096 on Intel x86), and it determines how much data is
-      buffered during read and write operations.</description>
-  </property>
-
-  <property>
-    <name>file.bytes-per-checksum</name>
-    <value>512</value>
-    <description>The number of bytes per checksum.  Must not be larger than
-      file.stream-buffer-size</description>
-  </property>
-
-  <property>
-    <name>file.client-write-packet-size</name>
-    <value>65536</value>
-    <description>Packet size for clients to write</description>
-  </property>
-
-  <property>
-    <name>file.blocksize</name>
-    <value>67108864</value>
-    <description>Block size</description>
-  </property>
-
-  <property>
-    <name>file.replication</name>
-    <value>1</value>
-    <description>Replication factor</description>
-  </property>
-
-  <!-- FTP file system -->
-  <property>
-    <name>ftp.stream-buffer-size</name>
-    <value>4096</value>
-    <description>The size of buffer to stream files.
-      The size of this buffer should probably be a multiple of hardware
-      page size (4096 on Intel x86), and it determines how much data is
-      buffered during read and write operations.</description>
-  </property>
-
-  <property>
-    <name>ftp.bytes-per-checksum</name>
-    <value>512</value>
-    <description>The number of bytes per checksum.  Must not be larger than
-      ftp.stream-buffer-size</description>
-  </property>
-
-  <property>
-    <name>ftp.client-write-packet-size</name>
-    <value>65536</value>
-    <description>Packet size for clients to write</description>
-  </property>
-
-  <property>
-    <name>ftp.blocksize</name>
-    <value>67108864</value>
-    <description>Block size</description>
-  </property>
-
-  <property>
-    <name>ftp.replication</name>
-    <value>3</value>
-    <description>Replication factor</description>
-  </property>
-
-  <!-- Tfile -->
-
-  <property>
-    <name>tfile.io.chunk.size</name>
-    <value>1048576</value>
-    <description>
-      Value chunk size in bytes. Default  to
-      1MB. Values of the length less than the chunk size is
-      guaranteed to have known value length in read time (See also
-      TFile.Reader.Scanner.Entry.isValueLengthKnown()).
-    </description>
-  </property>
-
-  <property>
-    <name>tfile.fs.output.buffer.size</name>
-    <value>262144</value>
-    <description>
-      Buffer size used for FSDataOutputStream in bytes.
-    </description>
-  </property>
-
-  <property>
-    <name>tfile.fs.input.buffer.size</name>
-    <value>262144</value>
-    <description>
-      Buffer size used for FSDataInputStream in bytes.
-    </description>
-  </property>
-
-  <!-- HTTP web-consoles Authentication -->
-
-  <property>
-    <name>hadoop.http.authentication.type</name>
-    <value>simple</value>
-    <description>
-      Defines authentication used for Oozie HTTP endpoint.
-      Supported values are: simple | kerberos | #AUTHENTICATION_HANDLER_CLASSNAME#
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.http.authentication.token.validity</name>
-    <value>36000</value>
-    <description>
-      Indicates how long (in seconds) an authentication token is valid before it has
-      to be renewed.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.http.authentication.signature.secret.file</name>
-    <value>${user.home}/hadoop-http-auth-signature-secret</value>
-    <description>
-      The signature secret for signing the authentication tokens.
-      The same secret should be used for JT/NN/DN/TT configurations.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.http.authentication.cookie.domain</name>
-    <value></value>
-    <description>
-      The domain to use for the HTTP cookie that stores the authentication token.
-      In order to authentiation to work correctly across all Hadoop nodes web-consoles
-      the domain must be correctly set.
-      IMPORTANT: when using IP addresses, browsers ignore cookies with domain settings.
-      For this setting to work properly all nodes in the cluster must be configured
-      to generate URLs with hostname.domain names on it.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.http.authentication.simple.anonymous.allowed</name>
-    <value>true</value>
-    <description>
-      Indicates if anonymous requests are allowed when using 'simple' authentication.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.http.authentication.kerberos.principal</name>
-    <value>HTTP/_HOST@LOCALHOST</value>
-    <description>
-      Indicates the Kerberos principal to be used for HTTP endpoint.
-      The principal MUST start with 'HTTP/' as per Kerberos HTTP SPNEGO specification.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.http.authentication.kerberos.keytab</name>
-    <value>${user.home}/hadoop.keytab</value>
-    <description>
-      Location of the keytab file with the credentials for the principal.
-      Referring to the same keytab file Oozie uses for its Kerberos credentials for Hadoop.
-    </description>
-  </property>
-
-  <!-- HTTP CORS support -->
-  <property>
-    <name>hadoop.http.cross-origin.enabled</name>
-    <value>false</value>
-    <description>Enable/disable the cross-origin (CORS) filter.</description>
-  </property>
-
-  <property>
-    <name>hadoop.http.cross-origin.allowed-origins</name>
-    <value>*</value>
-    <description>Comma separated list of origins that are allowed for web
-      services needing cross-origin (CORS) support. Wildcards (*) and patterns
-      allowed</description>
-  </property>
-
-  <property>
-    <name>hadoop.http.cross-origin.allowed-methods</name>
-    <value>GET,POST,HEAD</value>
-    <description>Comma separated list of methods that are allowed for web
-      services needing cross-origin (CORS) support.</description>
-  </property>
-
-  <property>
-    <name>hadoop.http.cross-origin.allowed-headers</name>
-    <value>X-Requested-With,Content-Type,Accept,Origin</value>
-    <description>Comma separated list of headers that are allowed for web
-      services needing cross-origin (CORS) support.</description>
-  </property>
-
-  <property>
-    <name>hadoop.http.cross-origin.max-age</name>
-    <value>1800</value>
-    <description>The number of seconds a pre-flighted request can be cached
-      for web services needing cross-origin (CORS) support.</description>
-  </property>
-
-  <property>
-    <name>dfs.ha.fencing.methods</name>
-    <value></value>
-    <description>
-      List of fencing methods to use for service fencing. May contain
-      builtin methods (eg shell and sshfence) or user-defined method.
-    </description>
-  </property>
-
-  <property>
-    <name>dfs.ha.fencing.ssh.connect-timeout</name>
-    <value>30000</value>
-    <description>
-      SSH connection timeout, in milliseconds, to use with the builtin
-      sshfence fencer.
-    </description>
-  </property>
-
-  <property>
-    <name>dfs.ha.fencing.ssh.private-key-files</name>
-    <value></value>
-    <description>
-      The SSH private key files to use with the builtin sshfence fencer.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.zookeeper.quorum</name>
-    <description>
-      A list of ZooKeeper server addresses, separated by commas, that are
-      to be used by the ZKFailoverController in automatic failover.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.zookeeper.session-timeout.ms</name>
-    <value>5000</value>
-    <description>
-      The session timeout to use when the ZKFC connects to ZooKeeper.
-      Setting this value to a lower value implies that server crashes
-      will be detected more quickly, but risks triggering failover too
-      aggressively in the case of a transient error or network blip.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.zookeeper.parent-znode</name>
-    <value>/hadoop-ha</value>
-    <description>
-      The ZooKeeper znode under which the ZK failover controller stores
-      its information. Note that the nameservice ID is automatically
-      appended to this znode, so it is not normally necessary to
-      configure this, even in a federated environment.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.zookeeper.acl</name>
-    <value>world:anyone:rwcda</value>
-    <description>
-      A comma-separated list of ZooKeeper ACLs to apply to the znodes
-      used by automatic failover. These ACLs are specified in the same
-      format as used by the ZooKeeper CLI.
-
-      If the ACL itself contains secrets, you may instead specify a
-      path to a file, prefixed with the '@' symbol, and the value of
-      this configuration will be loaded from within.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.zookeeper.auth</name>
-    <value></value>
-    <description>
-      A comma-separated list of ZooKeeper authentications to add when
-      connecting to ZooKeeper. These are specified in the same format
-      as used by the &quot;addauth&quot; command in the ZK CLI. It is
-      important that the authentications specified here are sufficient
-      to access znodes with the ACL specified in ha.zookeeper.acl.
-
-      If the auths contain secrets, you may instead specify a
-      path to a file, prefixed with the '@' symbol, and the value of
-      this configuration will be loaded from within.
-    </description>
-  </property>
-
-  <!-- Static Web User Filter properties. -->
-  <property>
-    <name>hadoop.http.staticuser.user</name>
-    <value>dr.who</value>
-    <description>
-      The user name to filter as, on static web filters
-      while rendering content. An example use is the HDFS
-      web UI (user to be used for browsing files).
-    </description>
-  </property>
-
-  <!-- SSLFactory configuration -->
-
-  <property>
-    <name>hadoop.ssl.keystores.factory.class</name>
-    <value>org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory</value>
-    <description>
-      The keystores factory to use for retrieving certificates.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.ssl.require.client.cert</name>
-    <value>false</value>
-    <description>Whether client certificates are required</description>
-  </property>
-
-  <property>
-    <name>hadoop.ssl.hostname.verifier</name>
-    <value>DEFAULT</value>
-    <description>
-      The hostname verifier to provide for HttpsURLConnections.
-      Valid values are: DEFAULT, STRICT, STRICT_IE6, DEFAULT_AND_LOCALHOST and
-      ALLOW_ALL
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.ssl.server.conf</name>
-    <value>ssl-server.xml</value>
-    <description>
-      Resource file from which ssl server keystore information will be extracted.
-      This file is looked up in the classpath, typically it should be in Hadoop
-      conf/ directory.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.ssl.client.conf</name>
-    <value>ssl-client.xml</value>
-    <description>
-      Resource file from which ssl client keystore information will be extracted
-      This file is looked up in the classpath, typically it should be in Hadoop
-      conf/ directory.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.ssl.enabled</name>
-    <value>false</value>
-    <description>
-      Deprecated. Use dfs.http.policy and yarn.http.policy instead.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.ssl.enabled.protocols</name>
-    <value>TLSv1,SSLv2Hello,TLSv1.1,TLSv1.2</value>
-    <description>
-      The supported SSL protocols.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.jetty.logs.serve.aliases</name>
-    <value>true</value>
-    <description>
-      Enable/Disable aliases serving from jetty
-    </description>
-  </property>
-
-  <property>
-    <name>fs.permissions.umask-mode</name>
-    <value>022</value>
-    <description>
-      The umask used when creating files and directories.
-      Can be in octal or in symbolic. Examples are:
-      "022" (octal for u=rwx,g=r-x,o=r-x in symbolic),
-      or "u=rwx,g=rwx,o=" (symbolic for 007 in octal).
-    </description>
-  </property>
-
-  <!-- ha properties -->
-
-  <property>
-    <name>ha.health-monitor.connect-retry-interval.ms</name>
-    <value>1000</value>
-    <description>
-      How often to retry connecting to the service.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.health-monitor.check-interval.ms</name>
-    <value>1000</value>
-    <description>
-      How often to check the service.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.health-monitor.sleep-after-disconnect.ms</name>
-    <value>1000</value>
-    <description>
-      How long to sleep after an unexpected RPC error.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.health-monitor.rpc-timeout.ms</name>
-    <value>45000</value>
-    <description>
-      Timeout for the actual monitorHealth() calls.
-    </description>
-  </property>
-
-  <property>
-    <name>ha.failover-controller.new-active.rpc-timeout.ms</name>
-    <value>60000</value>
-    <description>
-      Timeout that the FC waits for the new active to become active
-    </description>
-  </property>
-
-  <property>
-    <name>ha.failover-controller.graceful-fence.rpc-timeout.ms</name>
-    <value>5000</value>
-    <description>
-      Timeout that the FC waits for the old active to go to standby
-    </description>
-  </property>
-
-  <property>
-    <name>ha.failover-controller.graceful-fence.connection.retries</name>
-    <value>1</value>
-    <description>
-      FC connection retries for graceful fencing
-    </description>
-  </property>
-
-  <property>
-    <name>ha.failover-controller.cli-check.rpc-timeout.ms</name>
-    <value>20000</value>
-    <description>
-      Timeout that the CLI (manual) FC waits for monitorHealth, getServiceState
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.client.fallback-to-simple-auth-allowed</name>
-    <value>false</value>
-    <description>
-      When a client is configured to attempt a secure connection, but attempts to
-      connect to an insecure server, that server may instruct the client to
-      switch to SASL SIMPLE (unsecure) authentication. This setting controls
-      whether or not the client will accept this instruction from the server.
-      When false (the default), the client will not allow the fallback to SIMPLE
-      authentication, and will abort the connection.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.client.resolve.remote.symlinks</name>
-    <value>true</value>
-    <description>
-      Whether to resolve symlinks when accessing a remote Hadoop filesystem.
-      Setting this to false causes an exception to be thrown upon encountering
-      a symlink. This setting does not apply to local filesystems, which
-      automatically resolve local symlinks.
-    </description>
-  </property>
-
-  <property>
-    <name>nfs.exports.allowed.hosts</name>
-    <value>* rw</value>
-    <description>
-      By default, the export can be mounted by any client. The value string
-      contains machine name and access privilege, separated by whitespace
-      characters. The machine name format can be a single host, a Java regular
-      expression, or an IPv4 address. The access privilege uses rw or ro to
-      specify read/write or read-only access of the machines to exports. If the
-      access privilege is not provided, the default is read-only. Entries are separated by ";".
-      For example: "192.168.0.0/22 rw ; host.*\.example\.com ; host1.test.org ro;".
-      Only the NFS gateway needs to restart after this property is updated.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.user.group.static.mapping.overrides</name>
-    <value>dr.who=;</value>
-    <description>
-      Static mapping of user to groups. This will override the groups if
-      available in the system for the specified user. In other words, groups
-      look-up will not happen for these users, instead groups mapped in this
-      configuration will be used.
-      Mapping should be in this format.
-      user1=group1,group2;user2=;user3=group2;
-      Default, "dr.who=;" will consider "dr.who" as user without groups.
-    </description>
-  </property>
-
-  <property>
-    <name>rpc.metrics.quantile.enable</name>
-    <value>false</value>
-    <description>
-      Setting this property to true and rpc.metrics.percentiles.intervals
-      to a comma-separated list of the granularity in seconds, the
-      50/75/90/95/99th percentile latency for rpc queue/processing time in
-      milliseconds are added to rpc metrics.
-    </description>
-  </property>
-
-  <property>
-    <name>rpc.metrics.percentiles.intervals</name>
-    <value></value>
-    <description>
-      A comma-separated list of the granularity in seconds for the metrics which
-      describe the 50/75/90/95/99th percentile latency for rpc queue/processing
-      time. The metrics are outputted if rpc.metrics.quantile.enable is set to
-      true.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.crypto.codec.classes.EXAMPLECIPHERSUITE</name>
-    <value></value>
-    <description>
-      The prefix for a given crypto codec, contains a comma-separated
-      list of implementation classes for a given crypto codec (eg EXAMPLECIPHERSUITE).
-      The first implementation will be used if available, others are fallbacks.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.crypto.codec.classes.aes.ctr.nopadding</name>
-    <value>org.apache.hadoop.crypto.OpensslAesCtrCryptoCodec, org.apache.hadoop.crypto.JceAesCtrCryptoCodec</value>
-    <description>
-      Comma-separated list of crypto codec implementations for AES/CTR/NoPadding.
-      The first implementation will be used if available, others are fallbacks.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.crypto.cipher.suite</name>
-    <value>AES/CTR/NoPadding</value>
-    <description>
-      Cipher suite for crypto codec.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.crypto.jce.provider</name>
-    <value></value>
-    <description>
-      The JCE provider name used in CryptoCodec.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.crypto.buffer.size</name>
-    <value>8192</value>
-    <description>
-      The buffer size used by CryptoInputStream and CryptoOutputStream.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.java.secure.random.algorithm</name>
-    <value>SHA1PRNG</value>
-    <description>
-      The java secure random algorithm.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.secure.random.impl</name>
-    <value></value>
-    <description>
-      Implementation of secure random.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.random.device.file.path</name>
-    <value>/dev/urandom</value>
-    <description>
-      OS security random device file path.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.key.provider.path</name>
-    <description>
-      The KeyProvider to use when managing zone keys, and interacting with
-      encryption keys when reading and writing to an encryption zone.
-      For hdfs clients, the provider path will be same as namenode's
-      provider path.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.har.impl.disable.cache</name>
-    <value>true</value>
-    <description>Don't cache 'har' filesystem instances.</description>
-  </property>
-
-  <!--- KMSClientProvider configurations -->
-  <property>
-    <name>hadoop.security.kms.client.authentication.retry-count</name>
-    <value>1</value>
-    <description>
-      Number of time to retry connecting to KMS on authentication failure
-    </description>
-  </property>
-  <property>
-    <name>hadoop.security.kms.client.encrypted.key.cache.size</name>
-    <value>500</value>
-    <description>
-      Size of the EncryptedKeyVersion cache Queue for each key
-    </description>
-  </property>
-  <property>
-    <name>hadoop.security.kms.client.encrypted.key.cache.low-watermark</name>
-    <value>0.3f</value>
-    <description>
-      If size of the EncryptedKeyVersion cache Queue falls below the
-      low watermark, this cache queue will be scheduled for a refill
-    </description>
-  </property>
-  <property>
-    <name>hadoop.security.kms.client.encrypted.key.cache.num.refill.threads</name>
-    <value>2</value>
-    <description>
-      Number of threads to use for refilling depleted EncryptedKeyVersion
-      cache Queues
-    </description>
-  </property>
-  <property>
-    <name>hadoop.security.kms.client.encrypted.key.cache.expiry</name>
-    <value>43200000</value>
-    <description>
-      Cache expiry time for a Key, after which the cache Queue for this
-      key will be dropped. Default = 12hrs
-    </description>
-  </property>
-  <property>
-    <name>hadoop.security.kms.client.timeout</name>
-    <value>60</value>
-    <description>
-      Sets value for KMS client connection timeout, and the read timeout
-      to KMS servers.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.kms.client.failover.sleep.base.millis</name>
-    <value>100</value>
-    <description>
-      Expert only. The time to wait, in milliseconds, between failover
-      attempts increases exponentially as a function of the number of
-      attempts made so far, with a random factor of +/- 50%. This option
-      specifies the base value used in the failover calculation. The
-      first failover will retry immediately. The 2nd failover attempt
-      will delay at least hadoop.security.client.failover.sleep.base.millis
-      milliseconds. And so on.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.security.kms.client.failover.sleep.max.millis</name>
-    <value>2000</value>
-    <description>
-      Expert only. The time to wait, in milliseconds, between failover
-      attempts increases exponentially as a function of the number of
-      attempts made so far, with a random factor of +/- 50%. This option
-      specifies the maximum value to wait between failovers.
-      Specifically, the time between two failover attempts will not
-      exceed +/- 50% of hadoop.security.client.failover.sleep.max.millis
-      milliseconds.
-    </description>
-  </property>
-
-  <property>
-    <name>ipc.server.max.connections</name>
-    <value>0</value>
-    <description>The maximum number of concurrent connections a server is allowed
-      to accept. If this limit is exceeded, incoming connections will first fill
-      the listen queue and then may go to an OS-specific listen overflow queue.
-      The client may fail or timeout, but the server can avoid running out of file
-      descriptors using this feature. 0 means no limit.
-    </description>
-  </property>
-
-
-  <!-- YARN registry -->
-
-  <property>
-    <name>hadoop.registry.rm.enabled</name>
-    <value>false</value>
-    <description>
-      Is the registry enabled in the YARN Resource Manager?
-
-      If true, the YARN RM will, as needed.
-      create the user and system paths, and purge
-      service records when containers, application attempts
-      and applications complete.
-
-      If false, the paths must be created by other means,
-      and no automatic cleanup of service records will take place.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.zk.root</name>
-    <value>/registry</value>
-    <description>
-      The root zookeeper node for the registry
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.zk.session.timeout.ms</name>
-    <value>60000</value>
-    <description>
-      Zookeeper session timeout in milliseconds
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.zk.connection.timeout.ms</name>
-    <value>15000</value>
-    <description>
-      Zookeeper connection timeout in milliseconds
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.zk.retry.times</name>
-    <value>5</value>
-    <description>
-      Zookeeper connection retry count before failing
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.zk.retry.interval.ms</name>
-    <value>1000</value>
-    <description>
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.zk.retry.ceiling.ms</name>
-    <value>60000</value>
-    <description>
-      Zookeeper retry limit in milliseconds, during
-      exponential backoff.
-
-      This places a limit even
-      if the retry times and interval limit, combined
-      with the backoff policy, result in a long retry
-      period
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.zk.quorum</name>
-    <value>localhost:2181</value>
-    <description>
-      List of hostname:port pairs defining the
-      zookeeper quorum binding for the registry
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.secure</name>
-    <value>false</value>
-    <description>
-      Key to set if the registry is secure. Turning it on
-      changes the permissions policy from "open access"
-      to restrictions on kerberos with the option of
-      a user adding one or more auth key pairs down their
-      own tree.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.system.acls</name>
-    <value>sasl:yarn@, sasl:mapred@, sasl:hdfs@</value>
-    <description>
-      A comma separated list of Zookeeper ACL identifiers with
-      system access to the registry in a secure cluster.
-
-      These are given full access to all entries.
-
-      If there is an "@" at the end of a SASL entry it
-      instructs the registry client to append the default kerberos domain.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.kerberos.realm</name>
-    <value></value>
-    <description>
-      The kerberos realm: used to set the realm of
-      system principals which do not declare their realm,
-      and any other accounts that need the value.
-
-      If empty, the default realm of the running process
-      is used.
-
-      If neither are known and the realm is needed, then the registry
-      service/client will fail.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.registry.jaas.context</name>
-    <value>Client</value>
-    <description>
-      Key to define the JAAS context. Used in secure
-      mode
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.shell.missing.defaultFs.warning</name>
-    <value>false</value>
-    <description>
-      Enable hdfs shell commands to display warnings if (fs.defaultFS) property
-      is not set.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.shell.safely.delete.limit.num.files</name>
-    <value>100</value>
-    <description>Used by -safely option of hadoop fs shell -rm command to avoid
-      accidental deletion of large directories. When enabled, the -rm command
-      requires confirmation if the number of files to be deleted is greater than
-      this limit.  The default limit is 100 files. The warning is disabled if
-      the limit is 0 or the -safely is not specified in -rm command.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.client.htrace.sampler.classes</name>
-    <value></value>
-    <description>The class names of the HTrace Samplers to use for Hadoop
-      filesystem clients.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.htrace.span.receiver.classes</name>
-    <value></value>
-    <description>The class names of the Span Receivers to use for Hadoop.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.http.logs.enabled</name>
-    <value>true</value>
-    <description>
-      Enable the "/logs" endpoint on all Hadoop daemons, which serves local
-      logs, but may be considered a security risk due to it listing the contents
-      of a directory.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.client.resolve.topology.enabled</name>
-    <value>false</value>
-    <description>Whether the client machine will use the class specified by
-      property net.topology.node.switch.mapping.impl to compute the network
-      distance between itself and remote machines of the FileSystem. Additional
-      properties might need to be configured depending on the class specified
-      in net.topology.node.switch.mapping.impl. For example, if
-      org.apache.hadoop.net.ScriptBasedMapping is used, a valid script file
-      needs to be specified in net.topology.script.file.name.
-    </description>
-  </property>
-
-
-  <!-- Azure Data Lake File System Configurations -->
-
-  <property>
-    <name>fs.adl.impl</name>
-    <value>org.apache.hadoop.fs.adl.AdlFileSystem</value>
-  </property>
-
-  <property>
-    <name>fs.AbstractFileSystem.adl.impl</name>
-    <value>org.apache.hadoop.fs.adl.Adl</value>
-  </property>
-
-  <property>
-    <name>adl.feature.ownerandgroup.enableupn</name>
-    <value>false</value>
-    <description>
-      When true : User and Group in FileStatus/AclStatus response is
-      represented as user friendly name as per Azure AD profile.
-
-      When false (default) : User and Group in FileStatus/AclStatus
-      response is represented by the unique identifier from Azure AD
-      profile (Object ID as GUID).
-
-      For optimal performance, false is recommended.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.access.token.provider.type</name>
-    <value>ClientCredential</value>
-    <description>
-      Defines Azure Active Directory OAuth2 access token provider type.
-      Supported types are ClientCredential, RefreshToken, MSI, DeviceCode,
-      and Custom.
-      The ClientCredential type requires property fs.adl.oauth2.client.id,
-      fs.adl.oauth2.credential, and fs.adl.oauth2.refresh.url.
-      The RefreshToken type requires property fs.adl.oauth2.client.id and
-      fs.adl.oauth2.refresh.token.
-      The MSI type reads optional property fs.adl.oauth2.msi.port, if specified.
-      The DeviceCode type requires property
-      fs.adl.oauth2.devicecode.clientapp.id.
-      The Custom type requires property fs.adl.oauth2.access.token.provider.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.client.id</name>
-    <value></value>
-    <description>The OAuth2 client id.</description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.credential</name>
-    <value></value>
-    <description>The OAuth2 access key.</description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.refresh.url</name>
-    <value></value>
-    <description>The OAuth2 token endpoint.</description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.refresh.token</name>
-    <value></value>
-    <description>The OAuth2 refresh token.</description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.access.token.provider</name>
-    <value></value>
-    <description>
-      The class name of the OAuth2 access token provider.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.msi.port</name>
-    <value></value>
-    <description>
-      The localhost port for the MSI token service. This is the port specified
-      when creating the Azure VM. The default, if this setting is not specified,
-      is 50342.
-      Used by MSI token provider.
-    </description>
-  </property>
-
-  <property>
-    <name>fs.adl.oauth2.devicecode.clientapp.id</name>
-    <value></value>
-    <description>
-      The app id of the AAD native app in whose context the auth request
-      should be made.
-      Used by DeviceCode token provider.
-    </description>
-  </property>
-
-  <!-- Azure Data Lake File System Configurations Ends Here-->
-
-  <property>
-    <name>hadoop.caller.context.enabled</name>
-    <value>false</value>
-    <description>When the feature is enabled, additional fields are written into
-      name-node audit log records for auditing coarse granularity operations.
-    </description>
-  </property>
-  <property>
-    <name>hadoop.caller.context.max.size</name>
-    <value>128</value>
-    <description>The maximum bytes a caller context string can have. If the
-      passed caller context is longer than this maximum bytes, client will
-      truncate it before sending to server. Note that the server may have a
-      different maximum size, and will truncate the caller context to the
-      maximum size it allows.
-    </description>
-  </property>
-  <property>
-    <name>hadoop.caller.context.signature.max.size</name>
-    <value>40</value>
-    <description>
-      The caller's signature (optional) is for offline validation. If the
-      signature exceeds the maximum allowed bytes in server, the caller context
-      will be abandoned, in which case the caller context will not be recorded
-      in audit logs.
-    </description>
-  </property>
-  <!-- SequenceFile's Sorter properties -->
-  <property>
-    <name>seq.io.sort.mb</name>
-    <value>100</value>
-    <description>
-      The total amount of buffer memory to use while sorting files,
-      while using SequenceFile.Sorter, in megabytes. By default,
-      gives each merge stream 1MB, which should minimize seeks.
-    </description>
-  </property>
-  <property>
-    <name>seq.io.sort.factor</name>
-    <value>100</value>
-    <description>
-      The number of streams to merge at once while sorting
-      files using SequenceFile.Sorter.
-      This determines the number of open file handles.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.zk.address</name>
-    <!--value>127.0.0.1:2181</value-->
-    <description>Host:Port of the ZooKeeper server to be used.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.zk.num-retries</name>
-    <value>1000</value>
-    <description>Number of tries to connect to ZooKeeper.</description>
-  </property>
-
-  <property>
-    <name>hadoop.zk.retry-interval-ms</name>
-    <value>1000</value>
-    <description>Retry interval in milliseconds when connecting to ZooKeeper.
-    </description>
-  </property>
-
-  <property>
-    <name>hadoop.zk.timeout-ms</name>
-    <value>10000</value>
-    <description>ZooKeeper session timeout in milliseconds. Session expiration
-      is managed by the ZooKeeper cluster itself, not by the client. This value is
-      used by the cluster to determine when the client's session expires.
-      Expirations happens when the cluster does not hear from the client within
-      the specified session timeout period (i.e. no heartbeat).</description>
-  </property>
-
-  <property>
-    <name>hadoop.zk.acl</name>
-    <value>world:anyone:rwcda</value>
-    <description>ACL's to be used for ZooKeeper znodes.</description>
-  </property>
-
-  <property>
-    <name>hadoop.zk.auth</name>
-    <description>
-      Specify the auths to be used for the ACL's specified in hadoop.zk.acl.
-      This takes a comma-separated list of authentication mechanisms, each of the
-      form 'scheme:auth' (the same syntax used for the 'addAuth' command in
-      the ZK CLI).
-    </description>
-  </property>
-  <property>
-    <name>hadoop.treat.subject.external</name>
-    <value>false</value>
-    <description>
-      When creating UGI with UserGroupInformation(Subject), treat the passed
-      subject external if set to true, and assume the owner of the subject
-      should do the credential renewal.
-
-      When true this property will introduce an incompatible change which
-      may require changes in client code. For more details, see the jiras:
-      HADOOP-13805,HADOOP-13558.
-    </description>
-  </property>
+	<property>
+		<name>hadoop.security.group.mapping</name>
+		<value>this.does.not.exist.class</value>
+	</property>
 </configuration>
diff --git a/flink-filesystems/flink-hadoop-fs/src/main/java/org/apache/flink/runtime/fs/hdfs/HadoopFileSystem.java b/flink-filesystems/flink-hadoop-fs/src/main/java/org/apache/flink/runtime/fs/hdfs/HadoopFileSystem.java
index 065ba5a66f8..bceed5e95a8 100644
--- a/flink-filesystems/flink-hadoop-fs/src/main/java/org/apache/flink/runtime/fs/hdfs/HadoopFileSystem.java
+++ b/flink-filesystems/flink-hadoop-fs/src/main/java/org/apache/flink/runtime/fs/hdfs/HadoopFileSystem.java
@@ -19,16 +19,20 @@
 package org.apache.flink.runtime.fs.hdfs;
 
 import org.apache.flink.core.fs.BlockLocation;
+import org.apache.flink.core.fs.FSDataOutputStream;
 import org.apache.flink.core.fs.FileStatus;
 import org.apache.flink.core.fs.FileSystem;
 import org.apache.flink.core.fs.FileSystemKind;
 import org.apache.flink.core.fs.Path;
 import org.apache.flink.core.fs.RecoverableWriter;
+import org.apache.flink.core.fs.WriteOptions;
+import org.apache.flink.core.fs.WriteOptions.BlockOptions;
 
 import java.io.IOException;
 import java.net.URI;
 import java.util.Locale;
 
+import static org.apache.flink.util.Preconditions.checkArgument;
 import static org.apache.flink.util.Preconditions.checkNotNull;
 
 /**
@@ -36,6 +40,9 @@
  */
 public class HadoopFileSystem extends FileSystem {
 
+	/** The write buffer size used by default. */
+	public static final int DEFAULT_WRITE_BUFFER_SIZE = 4096;
+
 	/** The wrapped Hadoop File System. */
 	private final org.apache.hadoop.fs.FileSystem fs;
 
@@ -142,6 +149,24 @@ public HadoopDataOutputStream create(final Path f, final WriteMode overwrite) th
 		return new HadoopDataOutputStream(fsDataOutputStream);
 	}
 
+	@Override
+	public FSDataOutputStream create(Path f, WriteOptions options) throws IOException {
+		BlockOptions blockSettings = options.getBlockSettings();
+		if (blockSettings == null) {
+			return create(f, options.getOverwrite());
+		}
+		else {
+			checkArgument(blockSettings.getReplicationFactor() <= Short.MAX_VALUE,
+					"block replication factor out of bounds");
+
+			return create(f,
+					options.getOverwrite() == WriteMode.OVERWRITE,
+					DEFAULT_WRITE_BUFFER_SIZE,
+					(short) blockSettings.getReplicationFactor(),
+					blockSettings.getBlockSize());
+		}
+	}
+
 	@Override
 	public boolean delete(final Path f, final boolean recursive) throws IOException {
 		return this.fs.delete(toHadoopPath(f), recursive);
diff --git a/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/AbstractS3FileSystemFactory.java b/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/AbstractS3FileSystemFactory.java
index ed241384302..58144f08927 100644
--- a/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/AbstractS3FileSystemFactory.java
+++ b/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/AbstractS3FileSystemFactory.java
@@ -18,7 +18,10 @@
 
 package org.apache.flink.fs.s3.common;
 
+import org.apache.flink.configuration.ConfigOption;
+import org.apache.flink.configuration.ConfigOptions;
 import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.IllegalConfigurationException;
 import org.apache.flink.core.fs.FileSystem;
 import org.apache.flink.core.fs.FileSystemFactory;
 
@@ -28,9 +31,36 @@
 import java.io.IOException;
 import java.net.URI;
 
-/** Base class for Hadoop file system factories. */
+/**
+ * Base class for file system factories that create S3 file systems.
+ */
 public abstract class AbstractS3FileSystemFactory implements FileSystemFactory {
 
+	/**
+	 * The substring to be replaced by random entropy in checkpoint paths.
+	 */
+	public static final ConfigOption<String> ENTROPY_INJECT_KEY_OPTION = ConfigOptions
+			.key("s3.entropy.key")
+			.noDefaultValue()
+			.withDescription(
+					"This option can be used to improve performance due to sharding issues on Amazon S3. " +
+					"For file creations with entropy injection, this key will be replaced by random " +
+					"alphanumeric characters. For other file creations, the key will be filtered out.");
+
+	/**
+	 * The number of entropy characters, in case entropy injection is configured.
+	 */
+	public static final ConfigOption<Integer> ENTROPY_INJECT_LENGTH_OPTION = ConfigOptions
+			.key("s3.entropy.length")
+			.defaultValue(4)
+			.withDescription(
+					"When '" + ENTROPY_INJECT_KEY_OPTION.key() + "' is set, this option defines the number of " +
+					"random characters to replace the entropy key with.");
+
+	// ------------------------------------------------------------------------
+
+	private static final String INVALID_ENTROPY_KEY_CHARS = "^.*[~#@*+%{}<>\\[\\]|\"\\\\].*$";
+
 	private static final Logger LOG = LoggerFactory.getLogger(AbstractS3FileSystemFactory.class);
 
 	/** Name of this factory for logging. */
@@ -38,29 +68,60 @@
 
 	private final HadoopConfigLoader hadoopConfigLoader;
 
+	private Configuration flinkConfig;
+
 	protected AbstractS3FileSystemFactory(String name, HadoopConfigLoader hadoopConfigLoader) {
 		this.name = name;
 		this.hadoopConfigLoader = hadoopConfigLoader;
 	}
 
+	// ------------------------------------------------------------------------
+
 	@Override
 	public void configure(Configuration config) {
+		flinkConfig = config;
 		hadoopConfigLoader.setFlinkConfig(config);
 	}
 
 	@Override
 	public FileSystem create(URI fsUri) throws IOException {
+		Configuration flinkConfig = this.flinkConfig;
+
+		if (flinkConfig == null) {
+			LOG.warn("Creating S3 FileSystem without configuring the factory. All behavior will be default.");
+			flinkConfig = new Configuration();
+		}
+
 		LOG.debug("Creating S3 file system backed by {}", name);
 		LOG.debug("Loading Hadoop configuration for {}", name);
 
 		try {
+			// create the Hadoop FileSystem
 			org.apache.hadoop.conf.Configuration hadoopConfig = hadoopConfigLoader.getOrLoadHadoopConfig();
 			org.apache.hadoop.fs.FileSystem fs = createHadoopFileSystem();
 			fs.initialize(getInitURI(fsUri, hadoopConfig), hadoopConfig);
-			return new FlinkS3FileSystem(fs);
-		} catch (IOException ioe) {
-			throw ioe;
-		} catch (Exception e) {
+
+			// load the entropy injection settings
+			String entropyInjectionKey = flinkConfig.getString(ENTROPY_INJECT_KEY_OPTION);
+			int numEntropyChars = -1;
+			if (entropyInjectionKey != null) {
+				if (entropyInjectionKey.matches(INVALID_ENTROPY_KEY_CHARS)) {
+					throw new IllegalConfigurationException("Invalid character in value for " +
+							ENTROPY_INJECT_KEY_OPTION.key() + " : " + entropyInjectionKey);
+				}
+				numEntropyChars = flinkConfig.getInteger(ENTROPY_INJECT_LENGTH_OPTION);
+				if (numEntropyChars <= 0) {
+					throw new IllegalConfigurationException(
+							ENTROPY_INJECT_LENGTH_OPTION.key() + " must configure a value > 0");
+				}
+			}
+
+			return new FlinkS3FileSystem(fs, entropyInjectionKey, numEntropyChars);
+		}
+		catch (IOException e) {
+			throw e;
+		}
+		catch (Exception e) {
 			throw new IOException(e.getMessage(), e);
 		}
 	}
diff --git a/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/FlinkS3FileSystem.java b/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/FlinkS3FileSystem.java
index a3d960aa9df..bd13183ef49 100644
--- a/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/FlinkS3FileSystem.java
+++ b/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/FlinkS3FileSystem.java
@@ -18,22 +18,284 @@
 
 package org.apache.flink.fs.s3.common;
 
-import org.apache.flink.runtime.fs.hdfs.HadoopFileSystem;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.core.fs.BlockLocation;
+import org.apache.flink.core.fs.FSDataInputStream;
+import org.apache.flink.core.fs.FSDataOutputStream;
+import org.apache.flink.core.fs.FileStatus;
+import org.apache.flink.core.fs.FileSystem;
+import org.apache.flink.core.fs.FileSystemKind;
+import org.apache.flink.core.fs.Path;
+import org.apache.flink.core.fs.WriteOptions;
+import org.apache.flink.runtime.fs.hdfs.HadoopBlockLocation;
+import org.apache.flink.runtime.fs.hdfs.HadoopDataInputStream;
+import org.apache.flink.runtime.fs.hdfs.HadoopDataOutputStream;
+import org.apache.flink.runtime.fs.hdfs.HadoopFileStatus;
+import org.apache.flink.util.StringUtils;
+
+import javax.annotation.Nullable;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.concurrent.ThreadLocalRandom;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
 
 /**
  * Implementation of the Flink {@link org.apache.flink.core.fs.FileSystem} interface for S3.
  * This class implements the common behavior implemented directly by Flink and delegates
  * common calls to an implementation of Hadoop's filesystem abstraction.
  */
-public class FlinkS3FileSystem extends HadoopFileSystem {
+public class FlinkS3FileSystem extends FileSystem {
+
+	/** The underlying Hadoop File System. */
+	private final org.apache.hadoop.fs.FileSystem fs;
+
+	@Nullable
+	private final String entropyInjectionKey;
+
+	private final int entropyLength;
 
 	/**
-	 * Wraps the given Hadoop S3 File System object as a Flink S3 File System object.
+	 * Creates a FlinkS3FileSystem based on the given Hadoop S3 file system.
 	 * The given Hadoop file system object is expected to be initialized already.
 	 *
 	 * @param hadoopS3FileSystem The Hadoop FileSystem that will be used under the hood.
 	 */
 	public FlinkS3FileSystem(org.apache.hadoop.fs.FileSystem hadoopS3FileSystem) {
-		super(hadoopS3FileSystem);
+		this(hadoopS3FileSystem, null, -1);
+	}
+
+	/**
+	 * Creates a FlinkS3FileSystem based on the given Hadoop S3 file system.
+	 * The given Hadoop file system object is expected to be initialized already.
+	 *
+	 * <p>This constructor additionally configures the entropy injection for the file system.
+	 *
+	 * @param hadoopS3FileSystem The Hadoop FileSystem that will be used under the hood.
+	 * @param entropyInjectionKey The substring that will be replaced by entropy or removed.
+	 * @param entropyLength The number of random alphanumeric characters to inject as entropy.
+	 */
+	public FlinkS3FileSystem(
+			org.apache.hadoop.fs.FileSystem hadoopS3FileSystem,
+			@Nullable String entropyInjectionKey,
+			int entropyLength) {
+
+		if (entropyInjectionKey != null && entropyLength <= 0) {
+			throw new IllegalArgumentException("Entropy length must be >= 0 when entropy injection key is set");
+		}
+
+		this.fs = checkNotNull(hadoopS3FileSystem, "hadoopS3FileSystem");
+		this.entropyInjectionKey = entropyInjectionKey;
+		this.entropyLength = entropyLength;
+	}
+
+	// ------------------------------------------------------------------------
+	//  properties
+	// ------------------------------------------------------------------------
+
+	public org.apache.hadoop.fs.FileSystem getHadoopFileSystem() {
+		return fs;
+	}
+
+	@Nullable
+	public String getEntropyInjectionKey() {
+		return entropyInjectionKey;
+	}
+
+	public int getEntropyLength() {
+		return entropyLength;
+	}
+
+	// ------------------------------------------------------------------------
+	//  file system methods
+	// ------------------------------------------------------------------------
+
+	@Override
+	public Path getWorkingDirectory() {
+		return new Path(fs.getWorkingDirectory().toUri());
+	}
+
+	public Path getHomeDirectory() {
+		return new Path(fs.getHomeDirectory().toUri());
+	}
+
+	@Override
+	public URI getUri() {
+		return fs.getUri();
+	}
+
+	@Override
+	public FileStatus getFileStatus(final Path f) throws IOException {
+		org.apache.hadoop.fs.FileStatus status = fs.getFileStatus(toHadoopPath(f));
+		return new HadoopFileStatus(status);
+	}
+
+	@Override
+	public BlockLocation[] getFileBlockLocations(
+			final FileStatus file,
+			final long start,
+			final long len) throws IOException {
+
+		if (!(file instanceof HadoopFileStatus)) {
+			throw new IOException("file is not an instance of HadoopFileStatus");
+		}
+
+		final HadoopFileStatus f = (HadoopFileStatus) file;
+
+		final org.apache.hadoop.fs.BlockLocation[] blkLocations = fs.getFileBlockLocations(f.getInternalFileStatus(),
+				start, len);
+
+		// Wrap up HDFS specific block location objects
+		final HadoopBlockLocation[] distBlkLocations = new HadoopBlockLocation[blkLocations.length];
+		for (int i = 0; i < distBlkLocations.length; i++) {
+			distBlkLocations[i] = new HadoopBlockLocation(blkLocations[i]);
+		}
+
+		return distBlkLocations;
+	}
+
+	@Override
+	public FSDataInputStream open(final Path f, final int bufferSize) throws IOException {
+		final org.apache.hadoop.fs.Path path = toHadoopPath(f);
+		final org.apache.hadoop.fs.FSDataInputStream fdis = this.fs.open(path, bufferSize);
+		return new HadoopDataInputStream(fdis);
+	}
+
+	@Override
+	public FSDataInputStream open(final Path f) throws IOException {
+		final org.apache.hadoop.fs.Path path = toHadoopPath(f);
+		final org.apache.hadoop.fs.FSDataInputStream fdis = fs.open(path);
+		return new HadoopDataInputStream(fdis);
+	}
+
+	@Override
+	public FSDataOutputStream create(final Path f, final WriteMode overwrite) throws IOException {
+		final org.apache.hadoop.fs.FSDataOutputStream fsDataOutputStream =
+				fs.create(toHadoopPath(f), overwrite == WriteMode.OVERWRITE);
+		return new HadoopDataOutputStream(fsDataOutputStream);
+	}
+
+	@Override
+	public FSDataOutputStream create(final Path f, final WriteOptions options) throws IOException {
+		final org.apache.hadoop.fs.Path path = options.isInjectEntropy()
+				? toHadoopPathInjectEntropy(f)
+				: toHadoopPath(f);
+
+		final org.apache.hadoop.fs.FSDataOutputStream fsDataOutputStream = fs.create(
+				path, options.getOverwrite() == WriteMode.OVERWRITE);
+
+		return new HadoopDataOutputStream(fsDataOutputStream);
+	}
+
+	@Override
+	public boolean delete(final Path f, final boolean recursive) throws IOException {
+		return fs.delete(toHadoopPath(f), recursive);
+	}
+
+	@Override
+	public boolean exists(Path f) throws IOException {
+		return fs.exists(toHadoopPath(f));
+	}
+
+	@Override
+	public FileStatus[] listStatus(final Path f) throws IOException {
+		final org.apache.hadoop.fs.FileStatus[] hadoopFiles = fs.listStatus(toHadoopPath(f));
+		final FileStatus[] files = new FileStatus[hadoopFiles.length];
+
+		// Convert types
+		for (int i = 0; i < files.length; i++) {
+			files[i] = new HadoopFileStatus(hadoopFiles[i]);
+		}
+
+		return files;
+	}
+
+	@Override
+	public boolean mkdirs(final Path f) throws IOException {
+		return fs.mkdirs(toHadoopPath(f));
+	}
+
+	@Override
+	public boolean rename(final Path src, final Path dst) throws IOException {
+		return fs.rename(toHadoopPath(src), toHadoopPath(dst));
+	}
+
+	@SuppressWarnings("deprecation")
+	@Override
+	public long getDefaultBlockSize() {
+		return fs.getDefaultBlockSize();
+	}
+
+	@Override
+	public boolean isDistributedFS() {
+		return true;
+	}
+
+	@Override
+	public FileSystemKind getKind() {
+		return FileSystemKind.OBJECT_STORE;
+	}
+
+	// ------------------------------------------------------------------------
+	//  entropy utilities
+	// ------------------------------------------------------------------------
+
+	@VisibleForTesting
+	org.apache.hadoop.fs.Path toHadoopPath(Path path) throws IOException {
+		return rewritePathForEntropyKey(path, false);
+	}
+
+	@VisibleForTesting
+	org.apache.hadoop.fs.Path toHadoopPathInjectEntropy(Path path) throws IOException {
+		return rewritePathForEntropyKey(path, true);
+	}
+
+	private org.apache.hadoop.fs.Path rewritePathForEntropyKey(Path path, boolean addEntropy) throws IOException {
+		if (entropyInjectionKey == null) {
+			return convertToHadoopPath(path);
+		}
+		else {
+			final URI originalUri = path.toUri();
+			final String checkpointPath = originalUri.getPath();
+
+			final int indexOfKey = checkpointPath.indexOf(entropyInjectionKey);
+			if (indexOfKey == -1) {
+				return convertToHadoopPath(path);
+			}
+			else {
+				final StringBuilder buffer = new StringBuilder(checkpointPath.length());
+				buffer.append(checkpointPath, 0, indexOfKey);
+
+				if (addEntropy) {
+					StringUtils.appendRandomAlphanumericString(ThreadLocalRandom.current(), buffer, entropyLength);
+				}
+
+				buffer.append(checkpointPath, indexOfKey + entropyInjectionKey.length(), checkpointPath.length());
+
+				final String rewrittenPath = buffer.toString();
+				try {
+					return convertToHadoopPath(new URI(
+							originalUri.getScheme(),
+							originalUri.getAuthority(),
+							rewrittenPath,
+							originalUri.getQuery(),
+							originalUri.getFragment()));
+				}
+				catch (URISyntaxException e) {
+					// this should actually never happen, because the URI was valid before
+					throw new IOException("URI format error while processing path for entropy injection", e);
+				}
+			}
+		}
+	}
+
+	private static org.apache.hadoop.fs.Path convertToHadoopPath(URI uri) {
+		return new org.apache.hadoop.fs.Path(uri);
+	}
+
+	private static org.apache.hadoop.fs.Path convertToHadoopPath(Path path) {
+		return convertToHadoopPath(path.toUri());
 	}
 }
diff --git a/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/HadoopConfigLoader.java b/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/HadoopConfigLoader.java
index 5ca497cfd95..1bbb7574277 100644
--- a/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/HadoopConfigLoader.java
+++ b/flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/HadoopConfigLoader.java
@@ -97,7 +97,6 @@ public void setFlinkConfig(Configuration config) {
 		for (String key : flinkConfig.keySet()) {
 			for (String prefix : flinkConfigPrefixes) {
 				if (key.startsWith(prefix)) {
-					String value = flinkConfig.getString(key, null);
 					String newKey = hadoopConfigPrefix + key.substring(prefix.length());
 					String newValue = fixHadoopConfig(key, flinkConfig.getString(key, null));
 					hadoopConfig.set(newKey, newValue);
diff --git a/flink-filesystems/flink-s3-fs-base/src/test/java/org/apache/flink/fs/s3/common/S3EntropyFsFactoryTest.java b/flink-filesystems/flink-s3-fs-base/src/test/java/org/apache/flink/fs/s3/common/S3EntropyFsFactoryTest.java
new file mode 100644
index 00000000000..b78c9dc0790
--- /dev/null
+++ b/flink-filesystems/flink-s3-fs-base/src/test/java/org/apache/flink/fs/s3/common/S3EntropyFsFactoryTest.java
@@ -0,0 +1,79 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.fs.s3.common;
+
+import org.apache.flink.configuration.Configuration;
+
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import java.net.URI;
+import java.util.Collections;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests that the file system factory picks up the entropy configuration properly.
+ */
+public class S3EntropyFsFactoryTest {
+
+	@Test
+	public void testEntropyInjectionConfig() throws Exception {
+		final Configuration conf = new Configuration();
+		conf.setString("s3.entropy.key", "__entropy__");
+		conf.setInteger("s3.entropy.length", 7);
+
+		TestFsFactory factory = new TestFsFactory();
+		factory.configure(conf);
+
+		FlinkS3FileSystem fs = (FlinkS3FileSystem) factory.create(new URI("s3://test"));
+		assertEquals("__entropy__", fs.getEntropyInjectionKey());
+		assertEquals(7, fs.getEntropyLength());
+	}
+
+	// ------------------------------------------------------------------------
+
+	private static final class TestFsFactory extends AbstractS3FileSystemFactory {
+
+		TestFsFactory() {
+			super("testFs", new HadoopConfigLoader(
+					new String[0],
+					new String[0][],
+					"",
+					Collections.emptySet(),
+					Collections.emptySet(),
+					""));
+		}
+
+		@Override
+		protected org.apache.hadoop.fs.FileSystem createHadoopFileSystem() {
+			return Mockito.mock(org.apache.hadoop.fs.FileSystem.class);
+		}
+
+		@Override
+		protected URI getInitURI(URI fsUri, org.apache.hadoop.conf.Configuration hadoopConfig) {
+			return fsUri;
+		}
+
+		@Override
+		public String getScheme() {
+			return "test";
+		}
+	}
+}
diff --git a/flink-filesystems/flink-s3-fs-base/src/test/java/org/apache/flink/fs/s3/common/S3FileSystemEntropyTest.java b/flink-filesystems/flink-s3-fs-base/src/test/java/org/apache/flink/fs/s3/common/S3FileSystemEntropyTest.java
new file mode 100644
index 00000000000..437ac4630c4
--- /dev/null
+++ b/flink-filesystems/flink-s3-fs-base/src/test/java/org/apache/flink/fs/s3/common/S3FileSystemEntropyTest.java
@@ -0,0 +1,133 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.fs.s3.common;
+
+import org.apache.flink.core.fs.Path;
+import org.apache.flink.core.fs.WriteOptions;
+
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.junit.Test;
+import org.mockito.ArgumentCaptor;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyBoolean;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Tests for the entropy injection in the {@link FlinkS3FileSystem}.
+ */
+public class S3FileSystemEntropyTest {
+
+	@Test
+	public void testEmptyPath() throws Exception {
+		Path path = new Path("hdfs://localhost:12345");
+		FlinkS3FileSystem fs = createFs("test", 4);
+
+		assertEquals(toHadoopPath(path), fs.toHadoopPathInjectEntropy(path));
+		assertEquals(toHadoopPath(path), fs.toHadoopPath(path));
+	}
+
+	@Test
+	public void testFullUriNonMatching() throws Exception {
+		Path path = new Path("s3://hugo@myawesomehost:55522/path/to/the/file");
+		FlinkS3FileSystem fs = createFs("_entropy_key_", 4);
+
+		assertEquals(toHadoopPath(path), fs.toHadoopPathInjectEntropy(path));
+		assertEquals(toHadoopPath(path), fs.toHadoopPath(path));
+	}
+
+	@Test
+	public void testFullUriMatching() throws Exception {
+		Path path = new Path("s3://hugo@myawesomehost:55522/path/s0mek3y/the/file");
+		FlinkS3FileSystem fs = createFs("s0mek3y", 8);
+
+		org.apache.hadoop.fs.Path withEntropy = fs.toHadoopPathInjectEntropy(path);
+		org.apache.hadoop.fs.Path withoutEntropy = fs.toHadoopPath(path);
+
+		validateMatches(withEntropy, "s3://hugo@myawesomehost:55522/path/[a-zA-Z0-9]{8}/the/file");
+		assertEquals(new org.apache.hadoop.fs.Path("s3://hugo@myawesomehost:55522/path/the/file"), withoutEntropy);
+	}
+
+	@Test
+	public void testPathOnlyNonMatching() throws Exception {
+		Path path = new Path("/path/file");
+		FlinkS3FileSystem fs = createFs("_entropy_key_", 4);
+
+		assertEquals(toHadoopPath(path), fs.toHadoopPathInjectEntropy(path));
+		assertEquals(toHadoopPath(path), fs.toHadoopPath(path));
+	}
+
+	@Test
+	public void testPathOnlyMatching() throws Exception {
+		Path path = new Path("/path/_entropy_key_/file");
+		FlinkS3FileSystem fs = createFs("_entropy_key_", 4);
+
+		org.apache.hadoop.fs.Path withEntropy = fs.toHadoopPathInjectEntropy(path);
+		org.apache.hadoop.fs.Path withoutEntropy = fs.toHadoopPath(path);
+
+		validateMatches(withEntropy, "/path/[a-zA-Z0-9]{4}/file");
+		assertEquals(new org.apache.hadoop.fs.Path("/path/file"), withoutEntropy);
+	}
+
+	@Test
+	public void testEntropyNotFullSegment() throws Exception {
+		Path path = new Path("s3://myhost:122/entropy-_entropy_key_-suffix/file");
+		FlinkS3FileSystem fs = createFs("_entropy_key_", 3);
+
+		org.apache.hadoop.fs.Path withEntropy = fs.toHadoopPathInjectEntropy(path);
+		org.apache.hadoop.fs.Path withoutEntropy = fs.toHadoopPath(path);
+
+		validateMatches(withEntropy, "s3://myhost:122/entropy-[a-zA-Z0-9]{3}-suffix/file");
+		assertEquals(new org.apache.hadoop.fs.Path("s3://myhost:122/entropy--suffix/file"), withoutEntropy);
+	}
+
+	@Test
+	public void testWriteOptionWithEntropy() throws Exception {
+		FileSystem underlyingFs = mock(FileSystem.class);
+		when(underlyingFs.create(any(org.apache.hadoop.fs.Path.class), anyBoolean())).thenReturn(mock(FSDataOutputStream.class));
+		ArgumentCaptor<org.apache.hadoop.fs.Path> pathCaptor = ArgumentCaptor.forClass(org.apache.hadoop.fs.Path.class);
+
+		Path path = new Path("s3://hugo@myawesomehost:55522/path/s0mek3y/the/file");
+		FlinkS3FileSystem fs = new FlinkS3FileSystem(underlyingFs, "s0mek3y", 11);
+
+		fs.create(path, new WriteOptions().setInjectEntropy(true));
+		verify(underlyingFs).create(pathCaptor.capture(), anyBoolean());
+
+		validateMatches(pathCaptor.getValue(), "s3://hugo@myawesomehost:55522/path/[a-zA-Z0-9]{11}/the/file");
+	}
+
+	private static void validateMatches(org.apache.hadoop.fs.Path path, String pattern) {
+		if (!path.toString().matches(pattern)) {
+			fail("Path " + path + " does not match " + pattern);
+		}
+	}
+
+	private static FlinkS3FileSystem createFs(String entropyKey, int entropyLen) {
+		return new FlinkS3FileSystem(mock(FileSystem.class), entropyKey, entropyLen);
+	}
+
+	private org.apache.hadoop.fs.Path toHadoopPath(Path path) {
+		return new org.apache.hadoop.fs.Path(path.toUri());
+	}
+}
diff --git a/flink-filesystems/flink-s3-fs-base/src/test/resources/log4j-test.properties b/flink-filesystems/flink-s3-fs-base/src/test/resources/log4j-test.properties
new file mode 100644
index 00000000000..2be35890d31
--- /dev/null
+++ b/flink-filesystems/flink-s3-fs-base/src/test/resources/log4j-test.properties
@@ -0,0 +1,27 @@
+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+################################################################################
+
+# Set root logger level to OFF to not flood build logs
+# set manually to INFO for debugging purposes
+log4j.rootLogger=OFF, testlogger
+
+# testlogger is set to be a ConsoleAppender.
+log4j.appender.testlogger=org.apache.log4j.ConsoleAppender
+log4j.appender.testlogger.target = System.err
+log4j.appender.testlogger.layout=org.apache.log4j.PatternLayout
+log4j.appender.testlogger.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
diff --git a/flink-filesystems/flink-s3-fs-hadoop/README.md b/flink-filesystems/flink-s3-fs-hadoop/README.md
deleted file mode 100644
index f65ee61d189..00000000000
--- a/flink-filesystems/flink-s3-fs-hadoop/README.md
+++ /dev/null
@@ -1,36 +0,0 @@
-This project is a wrapper around Hadoop's s3a file system. By pulling a smaller dependency tree and
-shading all dependencies away, this keeps the appearance of Flink being Hadoop-free,
-from a dependency perspective.
-
-We also relocate the shaded Hadoop version to allow running in a different
-setup. For this to work, however, we needed to adapt Hadoop's `Configuration`
-class to load a (shaded) `core-default-shaded.xml` configuration with the
-relocated class names of classes loaded via reflection
-(in the future, we may need to extend this to `mapred-default.xml` and `hdfs-defaults.xml` and their respective configuration classes).
-
-# Changing the Hadoop Version
-
-If you want to change the Hadoop version this project depends on, the following
-steps are required to keep the shading correct:
-
-1. from the respective Hadoop jar (currently 2.8.1 as of the `s3hadoop.hadoop.version` property our `pom.xml`),
-  - copy `org/apache/hadoop/conf/Configuration.java` to `src/main/java/org/apache/hadoop/conf/` and
-    - replace `core-default.xml` with `core-default-shaded.xml`.
-  - copy `org/apache/hadoop/util/NativeCodeLoader.java` to `src/main/java/org/apache/hadoop/util/` and
-    - replace the static initializer with
-    ```
-  static {
-    LOG.info("Skipping native-hadoop library for flink-s3-fs-hadoop's relocated Hadoop... " +
-             "using builtin-java classes where applicable");
-  }
-```
-  - copy `core-default.xml` to `src/main/resources/core-default-shaded.xml` and
-    - change every occurrence of `org.apache.hadoop` into `org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop`
-  - copy `core-site.xml` to `src/test/resources/core-site.xml` (as is)
-2. verify the shaded jar:
-  - does not contain any unshaded classes except for `org.apache.flink.fs.s3hadoop.S3FileSystemFactory`
-  - all other classes should be under `org.apache.flink.fs.s3hadoop.shaded`
-  - there should be a `META-INF/services/org.apache.flink.core.fs.FileSystemFactory` file pointing to two classes: `org.apache.flink.fs.s3hadoop.S3FileSystemFactory` and `org.apache.flink.fs.s3hadoop.S3AFileSystemFactory`
-  - other service files under `META-INF/services` should have their names and contents in the relocated `org.apache.flink.fs.s3hadoop.shaded` package
-  - contains a `core-default-shaded.xml` file
-  - does not contain a `core-default.xml` or `core-site.xml` file
diff --git a/flink-filesystems/flink-s3-fs-presto/README.md b/flink-filesystems/flink-s3-fs-presto/README.md
deleted file mode 100644
index 7244f5b4708..00000000000
--- a/flink-filesystems/flink-s3-fs-presto/README.md
+++ /dev/null
@@ -1,37 +0,0 @@
-This project is a wrapper around the S3 file system from the Presto project which shades all dependencies.
-Initial simple tests seem to indicate that it responds slightly faster
-and in a bit more lightweight manner to write/read/list requests, compared
-to the Hadoop s3a FS, but it has some semantic differences.
-
-We also relocate the shaded Hadoop version to allow running in a different
-setup. For this to work, however, we needed to adapt Hadoop's `Configuration`
-class to load a (shaded) `core-default-shaded.xml` configuration with the
-relocated class names of classes loaded via reflection
-(in the future, we may need to extend this to `mapred-default.xml` and `hdfs-defaults.xml` and their respective configuration classes).
-
-# Changing the Hadoop Version
-
-If you want to change the Hadoop version this project depends on, the following
-steps are required to keep the shading correct:
-
-1. from the respective Hadoop jar (from the `com.facebook.presto.hadoop/hadoop-apache2` resource, currently version 2.7.3-1 as of our `pom.xml`),
-  - copy `org/apache/hadoop/conf/Configuration.java` to `src/main/java/org/apache/hadoop/conf/` and
-    - replace `core-default.xml` with `core-default-shaded.xml`.
-  - copy `org/apache/hadoop/util/NativeCodeLoader.java` to `src/main/java/org/apache/hadoop/util/` and
-    - replace the static initializer with
-    ```
-  static {
-    LOG.info("Skipping native-hadoop library for flink-s3-fs-presto's relocated Hadoop... " +
-             "using builtin-java classes where applicable");
-  }
-```
-  - copy `core-default.xml` to `src/main/resources/core-default-shaded.xml` and
-    - change every occurrence of `org.apache.hadoop` into `org.apache.flink.fs.s3presto.shaded.org.apache.hadoop`
-  - copy `core-site.xml` to `src/test/resources/core-site.xml` (as is)
-2. verify the shaded jar:
-  - does not contain any unshaded classes except for `org.apache.flink.fs.s3presto.S3FileSystemFactory`
-  - all other classes should be under `org.apache.flink.fs.s3presto.shaded`
-  - there should be a `META-INF/services/org.apache.flink.core.fs.FileSystemFactory` file pointing to the `org.apache.flink.fs.s3presto.S3FileSystemFactory` class
-  - other service files under `META-INF/services` should have their names and contents in the relocated `org.apache.flink.fs.s3presto.shaded` package
-  - contains a `core-default-shaded.xml` file
-  - does not contain a `core-default.xml` or `core-site.xml` file
diff --git a/flink-filesystems/flink-s3-fs-presto/src/test/resources/core-site.xml b/flink-filesystems/flink-s3-fs-presto/src/test/resources/core-site.xml
deleted file mode 100644
index 85c1f0d76f4..00000000000
--- a/flink-filesystems/flink-s3-fs-presto/src/test/resources/core-site.xml
+++ /dev/null
@@ -1,1978 +0,0 @@
-<?xml version="1.0"?>
-<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
-
-<!--
-   Licensed to the Apache Software Foundation (ASF) under one or more
-   contributor license agreements.  See the NOTICE file distributed with
-   this work for additional information regarding copyright ownership.
-   The ASF licenses this file to You under the Apache License, Version 2.0
-   (the "License"); you may not use this file except in compliance with
-   the License.  You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
--->
-
-<!-- Do not modify this file directly.  Instead, copy entries that you -->
-<!-- wish to modify from this file into core-site.xml and change them -->
-<!-- there.  If core-site.xml does not already exist, create it.      -->
-
-<configuration>
-
-<!--- global properties -->
-
-<property>
-  <name>hadoop.common.configuration.version</name>
-  <value>0.23.0</value>
-  <description>version of this configuration file</description>
-</property>
-
-<property>
-  <name>hadoop.tmp.dir</name>
-  <value>/tmp/hadoop-${user.name}</value>
-  <description>A base for other temporary directories.</description>
-</property>
-
-<property>
-  <name>io.native.lib.available</name>
-  <value>true</value>
-  <description>Controls whether to use native libraries for bz2 and zlib
-    compression codecs or not. The property does not control any other native
-    libraries.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.http.filter.initializers</name>
-  <value>org.apache.hadoop.http.lib.StaticUserWebFilter</value>
-  <description>A comma separated list of class names. Each class in the list 
-  must extend org.apache.hadoop.http.FilterInitializer. The corresponding 
-  Filter will be initialized. Then, the Filter will be applied to all user 
-  facing jsp and servlet web pages.  The ordering of the list defines the 
-  ordering of the filters.</description>
-</property>
-
-<!--- security properties -->
-
-<property>
-  <name>hadoop.security.authorization</name>
-  <value>false</value>
-  <description>Is service-level authorization enabled?</description>
-</property>
-
-<property>
-  <name>hadoop.security.instrumentation.requires.admin</name>
-  <value>false</value>
-  <description>
-    Indicates if administrator ACLs are required to access
-    instrumentation servlets (JMX, METRICS, CONF, STACKS).
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.authentication</name>
-  <value>simple</value>
-  <description>Possible values are simple (no authentication), and kerberos
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping</name>
-  <value>org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback</value>
-  <description>
-    Class for user to group mapping (get groups for a given user) for ACL. 
-    The default implementation,
-    org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback, 
-    will determine if the Java Native Interface (JNI) is available. If JNI is 
-    available the implementation will use the API within hadoop to resolve a 
-    list of groups for a user. If JNI is not available then the shell 
-    implementation, ShellBasedUnixGroupsMapping, is used.  This implementation 
-    shells out to the Linux/Unix environment with the 
-    <code>bash -c groups</code> command to resolve a list of groups for a user.
-  </description>
-</property>
-
-<!-- 
-=== Multiple group mapping providers configuration sample === 
-  This sample illustrates a typical use case for CompositeGroupsMapping where
-Hadoop authentication uses MIT Kerberos which trusts an AD realm. In this case, service
-principals such as hdfs, mapred, hbase, hive, oozie and etc can be placed in In MIT Kerberos,
-but end users are just from the trusted AD. For the service principals, ShellBasedUnixGroupsMapping
-provider can be used to query their groups for efficiency, and for end users, LdapGroupsMapping 
-provider can be used. This avoids to add group entries in AD for service principals when only using 
-LdapGroupsMapping provider.
-  In case multiple ADs are involved and trusted by the MIT Kerberos in this use case, LdapGroupsMapping
-provider can be used more times with different AD specific configurations. This sample also shows how
-to do that. Here are the necessary configurations.
-
-<property>
-  <name>hadoop.security.group.mapping</name>
-  <value>org.apache.hadoop.security.CompositeGroupsMapping</value>
-  <description>
-    Class for user to group mapping (get groups for a given user) for ACL, which 
-    makes use of other multiple providers to provide the service.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.providers</name>
-  <value>shell4services,ad4usersX,ad4usersY</value>
-  <description>
-    Comma separated of names of other providers to provide user to group mapping. 
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.providers.combined</name>
-  <value>true</value>
-  <description>
-    true or false to indicate whether groups from the providers are combined or not. The default value is true
-    If true, then all the providers will be tried to get groups and all the groups are combined to return as
-    the final results. Otherwise, providers are tried one by one in the configured list order, and if any
-    groups are retrieved from any provider, then the groups will be returned without trying the left ones.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.provider.shell4services</name>
-  <value>org.apache.hadoop.security.ShellBasedUnixGroupsMapping</value>
-  <description>
-    Class for group mapping provider named by 'shell4services'. The name can then be referenced 
-    by hadoop.security.group.mapping.providers property.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.provider.ad4usersX</name>
-  <value>org.apache.hadoop.security.LdapGroupsMapping</value>
-  <description>
-    Class for group mapping provider named by 'ad4usersX'. The name can then be referenced 
-    by hadoop.security.group.mapping.providers property.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.provider.ad4usersY</name>
-  <value>org.apache.hadoop.security.LdapGroupsMapping</value>
-  <description>
-    Class for group mapping provider named by 'ad4usersY'. The name can then be referenced 
-    by hadoop.security.group.mapping.providers property.
-  </description>
-</property>
-
-<property>
-<name>hadoop.security.group.mapping.provider.ad4usersX.ldap.url</name>
-<value>ldap://ad-host-for-users-X:389</value>
-  <description>
-    ldap url for the provider named by 'ad4usersX'. Note this property comes from 
-    'hadoop.security.group.mapping.ldap.url'.
-  </description>
-</property>
-
-<property>
-<name>hadoop.security.group.mapping.provider.ad4usersY.ldap.url</name>
-<value>ldap://ad-host-for-users-Y:389</value>
-  <description>
-    ldap url for the provider named by 'ad4usersY'. Note this property comes from 
-    'hadoop.security.group.mapping.ldap.url'.
-  </description>
-</property>
-
-You also need to configure other properties like
-  hadoop.security.group.mapping.ldap.bind.password.file and etc.
-for ldap providers in the same way as above does.
-
--->
- 
-<property>
-  <name>hadoop.security.groups.cache.secs</name>
-  <value>300</value>
-  <description>
-    This is the config controlling the validity of the entries in the cache
-    containing the user->group mapping. When this duration has expired,
-    then the implementation of the group mapping provider is invoked to get
-    the groups of the user and then cached back.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.groups.negative-cache.secs</name>
-  <value>30</value>
-  <description>
-    Expiration time for entries in the the negative user-to-group mapping
-    caching, in seconds. This is useful when invalid users are retrying
-    frequently. It is suggested to set a small value for this expiration, since
-    a transient error in group lookup could temporarily lock out a legitimate
-    user.
-
-    Set this to zero or negative value to disable negative user-to-group caching.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.groups.cache.warn.after.ms</name>
-  <value>5000</value>
-  <description>
-    If looking up a single user to group takes longer than this amount of
-    milliseconds, we will log a warning message.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.url</name>
-  <value></value>
-  <description>
-    The URL of the LDAP server to use for resolving user groups when using
-    the LdapGroupsMapping user to group mapping.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.ssl</name>
-  <value>false</value>
-  <description>
-    Whether or not to use SSL when connecting to the LDAP server.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.ssl.keystore</name>
-  <value></value>
-  <description>
-    File path to the SSL keystore that contains the SSL certificate required
-    by the LDAP server.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.ssl.keystore.password.file</name>
-  <value></value>
-  <description>
-    The path to a file containing the password of the LDAP SSL keystore.
-
-    IMPORTANT: This file should be readable only by the Unix user running
-    the daemons.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.bind.user</name>
-  <value></value>
-  <description>
-    The distinguished name of the user to bind as when connecting to the LDAP
-    server. This may be left blank if the LDAP server supports anonymous binds.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.bind.password.file</name>
-  <value></value>
-  <description>
-    The path to a file containing the password of the bind user.
-
-    IMPORTANT: This file should be readable only by the Unix user running
-    the daemons.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.base</name>
-  <value></value>
-  <description>
-    The search base for the LDAP connection. This is a distinguished name,
-    and will typically be the root of the LDAP directory.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.search.filter.user</name>
-  <value>(&amp;(objectClass=user)(sAMAccountName={0}))</value>
-  <description>
-    An additional filter to use when searching for LDAP users. The default will
-    usually be appropriate for Active Directory installations. If connecting to
-    an LDAP server with a non-AD schema, this should be replaced with
-    (&amp;(objectClass=inetOrgPerson)(uid={0}). {0} is a special string used to
-    denote where the username fits into the filter.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.search.filter.group</name>
-  <value>(objectClass=group)</value>
-  <description>
-    An additional filter to use when searching for LDAP groups. This should be
-    changed when resolving groups against a non-Active Directory installation.
-    posixGroups are currently not a supported group class.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.search.attr.member</name>
-  <value>member</value>
-  <description>
-    The attribute of the group object that identifies the users that are
-    members of the group. The default will usually be appropriate for
-    any LDAP installation.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.search.attr.group.name</name>
-  <value>cn</value>
-  <description>
-    The attribute of the group object that identifies the group name. The
-    default will usually be appropriate for all LDAP systems.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.group.mapping.ldap.directory.search.timeout</name>
-  <value>10000</value>
-  <description>
-    The attribute applied to the LDAP SearchControl properties to set a
-    maximum time limit when searching and awaiting a result.
-    Set to 0 if infinite wait period is desired.
-    Default is 10 seconds. Units in milliseconds.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.service.user.name.key</name>
-  <value></value>
-  <description>
-    For those cases where the same RPC protocol is implemented by multiple
-    servers, this configuration is required for specifying the principal
-    name to use for the service when the client wishes to make an RPC call.
-  </description>
-</property>
-
-
-<property>
-    <name>hadoop.security.uid.cache.secs</name>
-    <value>14400</value>
-    <description>
-        This is the config controlling the validity of the entries in the cache
-        containing the userId to userName and groupId to groupName used by
-        NativeIO getFstat().
-    </description>
-</property>
-
-<property>
-  <name>hadoop.rpc.protection</name>
-  <value>authentication</value>
-  <description>A comma-separated list of protection values for secured sasl 
-      connections. Possible values are authentication, integrity and privacy.
-      authentication means authentication only and no integrity or privacy; 
-      integrity implies authentication and integrity are enabled; and privacy 
-      implies all of authentication, integrity and privacy are enabled.
-      hadoop.security.saslproperties.resolver.class can be used to override
-      the hadoop.rpc.protection for a connection at the server side.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.saslproperties.resolver.class</name>
-  <value></value>
-  <description>SaslPropertiesResolver used to resolve the QOP used for a 
-      connection. If not specified, the full set of values specified in 
-      hadoop.rpc.protection is used while determining the QOP used for the 
-      connection. If a class is specified, then the QOP values returned by 
-      the class will be used while determining the QOP used for the connection.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.work.around.non.threadsafe.getpwuid</name>
-  <value>false</value>
-  <description>Some operating systems or authentication modules are known to
-  have broken implementations of getpwuid_r and getpwgid_r, such that these
-  calls are not thread-safe. Symptoms of this problem include JVM crashes
-  with a stack trace inside these functions. If your system exhibits this
-  issue, enable this configuration parameter to include a lock around the
-  calls as a workaround.
-
-  An incomplete list of some systems known to have this issue is available
-  at http://wiki.apache.org/hadoop/KnownBrokenPwuidImplementations
-  </description>
-</property>
-
-<property>
-  <name>hadoop.kerberos.kinit.command</name>
-  <value>kinit</value>
-  <description>Used to periodically renew Kerberos credentials when provided
-  to Hadoop. The default setting assumes that kinit is in the PATH of users
-  running the Hadoop client. Change this to the absolute path to kinit if this
-  is not the case.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.auth_to_local</name>
-  <value></value>
-  <description>Maps kerberos principals to local user names</description>
-</property>
-
-<!-- i/o properties -->
-<property>
-  <name>io.file.buffer.size</name>
-  <value>4096</value>
-  <description>The size of buffer for use in sequence files.
-  The size of this buffer should probably be a multiple of hardware
-  page size (4096 on Intel x86), and it determines how much data is
-  buffered during read and write operations.</description>
-</property>
-  
-<property>
-  <name>io.bytes.per.checksum</name>
-  <value>512</value>
-  <description>The number of bytes per checksum.  Must not be larger than
-  io.file.buffer.size.</description>
-</property>
-
-<property>
-  <name>io.skip.checksum.errors</name>
-  <value>false</value>
-  <description>If true, when a checksum error is encountered while
-  reading a sequence file, entries are skipped, instead of throwing an
-  exception.</description>
-</property>
-
-<property>
-  <name>io.compression.codecs</name>
-  <value></value>
-  <description>A comma-separated list of the compression codec classes that can
-  be used for compression/decompression. In addition to any classes specified
-  with this property (which take precedence), codec classes on the classpath
-  are discovered using a Java ServiceLoader.</description>
-</property>
-
-<property>
-  <name>io.compression.codec.bzip2.library</name>
-  <value>system-native</value>
-  <description>The native-code library to be used for compression and
-  decompression by the bzip2 codec.  This library could be specified
-  either by by name or the full pathname.  In the former case, the
-  library is located by the dynamic linker, usually searching the
-  directories specified in the environment variable LD_LIBRARY_PATH.
-  
-  The value of "system-native" indicates that the default system
-  library should be used.  To indicate that the algorithm should
-  operate entirely in Java, specify "java-builtin".</description>
-</property>
-
-<property>
-  <name>io.serializations</name>
-  <value>org.apache.hadoop.io.serializer.WritableSerialization,org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization,org.apache.hadoop.io.serializer.avro.AvroReflectSerialization</value>
-  <description>A list of serialization classes that can be used for
-  obtaining serializers and deserializers.</description>
-</property>
-
-<property>
-  <name>io.seqfile.local.dir</name>
-  <value>${hadoop.tmp.dir}/io/local</value>
-  <description>The local directory where sequence file stores intermediate
-  data files during merge.  May be a comma-separated list of
-  directories on different devices in order to spread disk i/o.
-  Directories that do not exist are ignored.
-  </description>
-</property>
-
-<property>
-  <name>io.map.index.skip</name>
-  <value>0</value>
-  <description>Number of index entries to skip between each entry.
-  Zero by default. Setting this to values larger than zero can
-  facilitate opening large MapFiles using less memory.</description>
-</property>
-
-<property>
-  <name>io.map.index.interval</name>
-  <value>128</value>
-  <description>
-    MapFile consist of two files - data file (tuples) and index file
-    (keys). For every io.map.index.interval records written in the
-    data file, an entry (record-key, data-file-position) is written
-    in the index file. This is to allow for doing binary search later
-    within the index file to look up records by their keys and get their
-    closest positions in the data file.
-  </description>
-</property>
-
-<!-- file system properties -->
-
-<property>
-  <name>fs.defaultFS</name>
-  <value>file:///</value>
-  <description>The name of the default file system.  A URI whose
-  scheme and authority determine the FileSystem implementation.  The
-  uri's scheme determines the config property (fs.SCHEME.impl) naming
-  the FileSystem implementation class.  The uri's authority is used to
-  determine the host, port, etc. for a filesystem.</description>
-</property>
-
-<property>
-  <name>fs.default.name</name>
-  <value>file:///</value>
-  <description>Deprecated. Use (fs.defaultFS) property
-  instead</description>
-</property>
-
-<property>
-  <name>fs.trash.interval</name>
-  <value>0</value>
-  <description>Number of minutes after which the checkpoint
-  gets deleted.  If zero, the trash feature is disabled.
-  This option may be configured both on the server and the
-  client. If trash is disabled server side then the client
-  side configuration is checked. If trash is enabled on the
-  server side then the value configured on the server is
-  used and the client configuration value is ignored.
-  </description>
-</property>
-
-<property>
-  <name>fs.trash.checkpoint.interval</name>
-  <value>0</value>
-  <description>Number of minutes between trash checkpoints.
-  Should be smaller or equal to fs.trash.interval. If zero,
-  the value is set to the value of fs.trash.interval.
-  Every time the checkpointer runs it creates a new checkpoint 
-  out of current and removes checkpoints created more than 
-  fs.trash.interval minutes ago.
-  </description>
-</property>
-
-<property>
-  <name>fs.AbstractFileSystem.file.impl</name>
-  <value>org.apache.hadoop.fs.local.LocalFs</value>
-  <description>The AbstractFileSystem for file: uris.</description>
-</property>
-
-<property>
-  <name>fs.AbstractFileSystem.har.impl</name>
-  <value>org.apache.hadoop.fs.HarFs</value>
-  <description>The AbstractFileSystem for har: uris.</description>
-</property> 
-
-<property>
-  <name>fs.AbstractFileSystem.hdfs.impl</name>
-  <value>org.apache.hadoop.fs.Hdfs</value>
-  <description>The FileSystem for hdfs: uris.</description>
-</property>
-
-<property>
-  <name>fs.AbstractFileSystem.viewfs.impl</name>
-  <value>org.apache.hadoop.fs.viewfs.ViewFs</value>
-  <description>The AbstractFileSystem for view file system for viewfs: uris
-  (ie client side mount table:).</description>
-</property>
-
-<property>
-  <name>fs.AbstractFileSystem.ftp.impl</name>
-  <value>org.apache.hadoop.fs.ftp.FtpFs</value>
-  <description>The FileSystem for Ftp: uris.</description>
-</property>
-
-<property>
-  <name>fs.ftp.host</name>
-  <value>0.0.0.0</value>
-  <description>FTP filesystem connects to this server</description>
-</property>
-
-<property>
-  <name>fs.ftp.host.port</name>
-  <value>21</value>
-  <description>
-    FTP filesystem connects to fs.ftp.host on this port
-  </description>
-</property>
-
-<property>
-  <name>fs.df.interval</name>
-  <value>60000</value>
-  <description>Disk usage statistics refresh interval in msec.</description>
-</property>
-
-<property>
-  <name>fs.du.interval</name>
-  <value>600000</value>
-  <description>File space usage statistics refresh interval in msec.</description>
-</property>
-
-<property>
-  <name>fs.s3.block.size</name>
-  <value>67108864</value>
-  <description>Block size to use when writing files to S3.</description>
-</property>
-
-<property>
-  <name>fs.s3.buffer.dir</name>
-  <value>${hadoop.tmp.dir}/s3</value>
-  <description>Determines where on the local filesystem the S3 filesystem
-  should store files before sending them to S3
-  (or after retrieving them from S3).
-  </description>
-</property>
-
-<property>
-  <name>fs.s3.maxRetries</name>
-  <value>4</value>
-  <description>The maximum number of retries for reading or writing files to S3, 
-  before we signal failure to the application.
-  </description>
-</property>
-
-<property>
-  <name>fs.s3.sleepTimeSeconds</name>
-  <value>10</value>
-  <description>The number of seconds to sleep between each S3 retry.
-  </description>
-</property>
-
-<property>
-  <name>fs.swift.impl</name>
-  <value>org.apache.hadoop.fs.swift.snative.SwiftNativeFileSystem</value>
-  <description>The implementation class of the OpenStack Swift Filesystem</description>
-</property>
-
-<property>
-  <name>fs.automatic.close</name>
-  <value>true</value>
-  <description>By default, FileSystem instances are automatically closed at program
-  exit using a JVM shutdown hook. Setting this property to false disables this
-  behavior. This is an advanced option that should only be used by server applications
-  requiring a more carefully orchestrated shutdown sequence.
-  </description>
-</property>
-
-<property>
-  <name>fs.s3n.block.size</name>
-  <value>67108864</value>
-  <description>Block size to use when reading files using the native S3
-  filesystem (s3n: URIs).</description>
-</property>
-
-<property>
-  <name>fs.s3n.multipart.uploads.enabled</name>
-  <value>false</value>
-  <description>Setting this property to true enables multiple uploads to
-  native S3 filesystem. When uploading a file, it is split into blocks
-  if the size is larger than fs.s3n.multipart.uploads.block.size.
-  </description>
-</property>
-
-<property>
-  <name>fs.s3n.multipart.uploads.block.size</name>
-  <value>67108864</value>
-  <description>The block size for multipart uploads to native S3 filesystem.
-  Default size is 64MB.
-  </description>
-</property>
-
-<property>
-  <name>fs.s3n.multipart.copy.block.size</name>
-  <value>5368709120</value>
-  <description>The block size for multipart copy in native S3 filesystem.
-  Default size is 5GB.
-  </description>
-</property>
-
-<property>
-  <name>fs.s3n.server-side-encryption-algorithm</name>
-  <value></value>
-  <description>Specify a server-side encryption algorithm for S3.
-  The default is NULL, and the only other currently allowable value is AES256.
-  </description>
-</property>
-
-<property>
-  <name>fs.s3a.awsAccessKeyId</name>
-  <description>AWS access key ID. Omit for Role-based authentication.</description>
-</property>
-
-<property>
-  <name>fs.s3a.awsSecretAccessKey</name>
-  <description>AWS secret key. Omit for Role-based authentication.</description>
-</property>
-
-<property>
-  <name>fs.s3a.connection.maximum</name>
-  <value>15</value>
-  <description>Controls the maximum number of simultaneous connections to S3.</description>
-</property>
-
-<property>
-  <name>fs.s3a.connection.ssl.enabled</name>
-  <value>true</value>
-  <description>Enables or disables SSL connections to S3.</description>
-</property>
-
-<property>
-  <name>fs.s3a.endpoint</name>
-  <description>AWS S3 endpoint to connect to. An up-to-date list is
-    provided in the AWS Documentation: regions and endpoints. Without this
-    property, the standard region (s3.amazonaws.com) is assumed.
-  </description>
-</property>
-
-<property>
-  <name>fs.s3a.proxy.host</name>
-  <description>Hostname of the (optional) proxy server for S3 connections.</description>
-</property>
-
-<property>
-  <name>fs.s3a.proxy.port</name>
-  <description>Proxy server port. If this property is not set
-    but fs.s3a.proxy.host is, port 80 or 443 is assumed (consistent with
-    the value of fs.s3a.connection.ssl.enabled).</description>
-</property>
-
-<property>
-  <name>fs.s3a.proxy.username</name>
-  <description>Username for authenticating with proxy server.</description>
-</property>
-
-<property>
-  <name>fs.s3a.proxy.password</name>
-  <description>Password for authenticating with proxy server.</description>
-</property>
-
-<property>
-  <name>fs.s3a.proxy.domain</name>
-  <description>Domain for authenticating with proxy server.</description>
-</property>
-
-<property>
-  <name>fs.s3a.proxy.workstation</name>
-  <description>Workstation for authenticating with proxy server.</description>
-</property>
-
-<property>
-  <name>fs.s3a.attempts.maximum</name>
-  <value>10</value>
-  <description>How many times we should retry commands on transient errors.</description>
-</property>
-
-<property>
-  <name>fs.s3a.connection.establish.timeout</name>
-  <value>5000</value>
-  <description>Socket connection setup timeout in milliseconds.</description>
-</property>
-
-<property>
-  <name>fs.s3a.connection.timeout</name>
-  <value>50000</value>
-  <description>Socket connection timeout in milliseconds.</description>
-</property>
-
-<property>
-  <name>fs.s3a.paging.maximum</name>
-  <value>5000</value>
-  <description>How many keys to request from S3 when doing 
-     directory listings at a time.</description>
-</property>
-
-<property>
-  <name>fs.s3a.threads.max</name>
-  <value>256</value>
-  <description> Maximum number of concurrent active (part)uploads,
-    which each use a thread from the threadpool.</description>
-</property>
-
-<property>
-  <name>fs.s3a.threads.core</name>
-  <value>15</value>
-  <description>Number of core threads in the threadpool.</description>
-</property>
-
-<property>
-  <name>fs.s3a.threads.keepalivetime</name>
-  <value>60</value>
-  <description>Number of seconds a thread can be idle before being
-    terminated.</description>
-</property>
-
-<property>
-  <name>fs.s3a.max.total.tasks</name>
-  <value>1000</value>
-  <description>Number of (part)uploads allowed to the queue before
-    blocking additional uploads.</description>
-</property>
-
-<property>
-  <name>fs.s3a.multipart.size</name>
-  <value>104857600</value>
-  <description>How big (in bytes) to split upload or copy operations up into.</description>
-</property>
-
-<property>
-  <name>fs.s3a.multipart.threshold</name>
-  <value>2147483647</value>
-  <description>Threshold before uploads or copies use parallel multipart operations.</description>
-</property>
-
-<property>
-  <name>fs.s3a.acl.default</name>
-  <description>Set a canned ACL for newly created and copied objects. Value may be private, 
-     public-read, public-read-write, authenticated-read, log-delivery-write, 
-     bucket-owner-read, or bucket-owner-full-control.</description>
-</property>
-
-<property>
-  <name>fs.s3a.multipart.purge</name>
-  <value>false</value>
-  <description>True if you want to purge existing multipart uploads that may not have been
-     completed/aborted correctly</description>
-</property>
-
-<property>
-  <name>fs.s3a.multipart.purge.age</name>
-  <value>86400</value>
-  <description>Minimum age in seconds of multipart uploads to purge</description>
-</property>
-
-<property>
-  <name>fs.s3a.buffer.dir</name>
-  <value>${hadoop.tmp.dir}/s3a</value>
-  <description>Comma separated list of directories that will be used to buffer file 
-    uploads to.</description>
-</property>
-
-<property>
-  <name>fs.s3a.fast.upload</name>
-  <value>false</value>
-  <description>Upload directly from memory instead of buffering to
-    disk first. Memory usage and parallelism can be controlled as up to
-    fs.s3a.multipart.size memory is consumed for each (part)upload actively
-    uploading (fs.s3a.threads.max) or queueing (fs.s3a.max.total.tasks)</description>
-</property>
-
-  <property>
-  <name>fs.s3a.fast.buffer.size</name>
-  <value>1048576</value>
-  <description>Size of initial memory buffer in bytes allocated for an
-    upload. No effect if fs.s3a.fast.upload is false.</description>
-</property>
-
-<property>
-  <name>fs.s3a.impl</name>
-  <value>org.apache.hadoop.fs.s3a.S3AFileSystem</value>
-  <description>The implementation class of the S3A Filesystem</description>
-</property>
-
-<property>
-  <name>io.seqfile.compress.blocksize</name>
-  <value>1000000</value>
-  <description>The minimum block size for compression in block compressed 
-          SequenceFiles.
-  </description>
-</property>
-
-<property>
-  <name>io.seqfile.lazydecompress</name>
-  <value>true</value>
-  <description>Should values of block-compressed SequenceFiles be decompressed
-          only when necessary.
-  </description>
-</property>
-
-<property>
-  <name>io.seqfile.sorter.recordlimit</name>
-  <value>1000000</value>
-  <description>The limit on number of records to be kept in memory in a spill 
-          in SequenceFiles.Sorter
-  </description>
-</property>
-
- <property>
-  <name>io.mapfile.bloom.size</name>
-  <value>1048576</value>
-  <description>The size of BloomFilter-s used in BloomMapFile. Each time this many
-  keys is appended the next BloomFilter will be created (inside a DynamicBloomFilter).
-  Larger values minimize the number of filters, which slightly increases the performance,
-  but may waste too much space if the total number of keys is usually much smaller
-  than this number.
-  </description>
-</property>
-
-<property>
-  <name>io.mapfile.bloom.error.rate</name>
-  <value>0.005</value>
-  <description>The rate of false positives in BloomFilter-s used in BloomMapFile.
-  As this value decreases, the size of BloomFilter-s increases exponentially. This
-  value is the probability of encountering false positives (default is 0.5%).
-  </description>
-</property>
-
-<property>
-  <name>hadoop.util.hash.type</name>
-  <value>murmur</value>
-  <description>The default implementation of Hash. Currently this can take one of the
-  two values: 'murmur' to select MurmurHash and 'jenkins' to select JenkinsHash.
-  </description>
-</property>
-
-
-<!-- ipc properties -->
-
-<property>
-  <name>ipc.client.idlethreshold</name>
-  <value>4000</value>
-  <description>Defines the threshold number of connections after which
-               connections will be inspected for idleness.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.kill.max</name>
-  <value>10</value>
-  <description>Defines the maximum number of clients to disconnect in one go.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.connection.maxidletime</name>
-  <value>10000</value>
-  <description>The maximum time in msec after which a client will bring down the
-               connection to the server.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.connect.max.retries</name>
-  <value>10</value>
-  <description>Indicates the number of retries a client will make to establish
-               a server connection.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.connect.retry.interval</name>
-  <value>1000</value>
-  <description>Indicates the number of milliseconds a client will wait for
-    before retrying to establish a server connection.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.connect.timeout</name>
-  <value>20000</value>
-  <description>Indicates the number of milliseconds a client will wait for the 
-               socket to establish a server connection.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.connect.max.retries.on.timeouts</name>
-  <value>45</value>
-  <description>Indicates the number of retries a client will make on socket timeout
-               to establish a server connection.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.ping</name>
-  <value>true</value>
-  <description>Send a ping to the server when timeout on reading the response,
-  if set to true. If no failure is detected, the client retries until at least
-  a byte is read.
-  </description>
-</property>
-
-<property>
-  <name>ipc.ping.interval</name>
-  <value>60000</value>
-  <description>Timeout on waiting response from server, in milliseconds.
-  The client will send ping when the interval is passed without receiving bytes,
-  if ipc.client.ping is set to true.
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.rpc-timeout.ms</name>
-  <value>0</value>
-  <description>Timeout on waiting response from server, in milliseconds.
-  Currently this timeout works only when ipc.client.ping is set to true
-  because it uses the same facilities with IPC ping.
-  The timeout overrides the ipc.ping.interval and client will throw exception
-  instead of sending ping when the interval is passed.
-  </description>
-</property>
-
-<property>
-  <name>ipc.server.listen.queue.size</name>
-  <value>128</value>
-  <description>Indicates the length of the listen queue for servers accepting
-               client connections.
-  </description>
-</property>
-
-<property>
-  <name>ipc.maximum.data.length</name>
-  <value>67108864</value>
-  <description>This indicates the maximum IPC message length (bytes) that can be
-    accepted by the server. Messages larger than this value are rejected by
-    server immediately. This setting should rarely need to be changed. It merits
-    investigating whether the cause of long RPC messages can be fixed instead,
-    e.g. by splitting into smaller messages.
-  </description>
-</property>
-
-<!-- Proxy Configuration -->
-
-<property>
-  <name>hadoop.security.impersonation.provider.class</name>
-  <value></value>
-  <description>A class which implements ImpersonationProvider interface, used to 
-       authorize whether one user can impersonate a specific user. 
-       If not specified, the DefaultImpersonationProvider will be used. 
-       If a class is specified, then that class will be used to determine 
-       the impersonation capability.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.rpc.socket.factory.class.default</name>
-  <value>org.apache.hadoop.net.StandardSocketFactory</value>
-  <description> Default SocketFactory to use. This parameter is expected to be
-    formatted as "package.FactoryClassName".
-  </description>
-</property>
-
-<property>
-  <name>hadoop.rpc.socket.factory.class.ClientProtocol</name>
-  <value></value>
-  <description> SocketFactory to use to connect to a DFS. If null or empty, use
-    hadoop.rpc.socket.class.default. This socket factory is also used by
-    DFSClient to create sockets to DataNodes.
-  </description>
-</property>
-
-
-
-<property>
-  <name>hadoop.socks.server</name>
-  <value></value>
-  <description> Address (host:port) of the SOCKS server to be used by the
-    SocksSocketFactory.
-  </description>
-</property>
-
-<!-- Topology Configuration -->
-<property>
-  <name>net.topology.node.switch.mapping.impl</name>
-  <value>org.apache.hadoop.net.ScriptBasedMapping</value>
-  <description> The default implementation of the DNSToSwitchMapping. It
-    invokes a script specified in net.topology.script.file.name to resolve
-    node names. If the value for net.topology.script.file.name is not set, the
-    default value of DEFAULT_RACK is returned for all node names.
-  </description>
-</property>
-
-<property>
-  <name>net.topology.impl</name>
-  <value>org.apache.hadoop.net.NetworkTopology</value>
-  <description> The default implementation of NetworkTopology which is classic three layer one.
-  </description>
-</property>
-
-<property>
-  <name>net.topology.script.file.name</name>
-  <value></value>
-  <description> The script name that should be invoked to resolve DNS names to
-    NetworkTopology names. Example: the script would take host.foo.bar as an
-    argument, and return /rack1 as the output.
-  </description>
-</property>
-
-<property>
-  <name>net.topology.script.number.args</name>
-  <value>100</value>
-  <description> The max number of args that the script configured with 
-    net.topology.script.file.name should be run with. Each arg is an
-    IP address.
-  </description>
-</property>
-
-<property>
-  <name>net.topology.table.file.name</name>
-  <value></value>
-  <description> The file name for a topology file, which is used when the
-    net.topology.node.switch.mapping.impl property is set to
-    org.apache.hadoop.net.TableMapping. The file format is a two column text
-    file, with columns separated by whitespace. The first column is a DNS or
-    IP address and the second column specifies the rack where the address maps.
-    If no entry corresponding to a host in the cluster is found, then 
-    /default-rack is assumed.
-  </description>
-</property>
-
-<!-- Local file system -->
-<property>
-  <name>file.stream-buffer-size</name>
-  <value>4096</value>
-  <description>The size of buffer to stream files.
-  The size of this buffer should probably be a multiple of hardware
-  page size (4096 on Intel x86), and it determines how much data is
-  buffered during read and write operations.</description>
-</property>
-
-<property>
-  <name>file.bytes-per-checksum</name>
-  <value>512</value>
-  <description>The number of bytes per checksum.  Must not be larger than
-  file.stream-buffer-size</description>
-</property>
-
-<property>
-  <name>file.client-write-packet-size</name>
-  <value>65536</value>
-  <description>Packet size for clients to write</description>
-</property>
-
-<property>
-  <name>file.blocksize</name>
-  <value>67108864</value>
-  <description>Block size</description>
-</property>
-
-<property>
-  <name>file.replication</name>
-  <value>1</value>
-  <description>Replication factor</description>
-</property>
-
-<!-- s3 File System -->
-
-<property>
-  <name>s3.stream-buffer-size</name>
-  <value>4096</value>
-  <description>The size of buffer to stream files.
-  The size of this buffer should probably be a multiple of hardware
-  page size (4096 on Intel x86), and it determines how much data is
-  buffered during read and write operations.</description>
-</property>
-
-<property>
-  <name>s3.bytes-per-checksum</name>
-  <value>512</value>
-  <description>The number of bytes per checksum.  Must not be larger than
-  s3.stream-buffer-size</description>
-</property>
-
-<property>
-  <name>s3.client-write-packet-size</name>
-  <value>65536</value>
-  <description>Packet size for clients to write</description>
-</property>
-
-<property>
-  <name>s3.blocksize</name>
-  <value>67108864</value>
-  <description>Block size</description>
-</property>
-
-<property>
-  <name>s3.replication</name>
-  <value>3</value>
-  <description>Replication factor</description>
-</property>
-
-<!-- s3native File System -->
-
-<property>
-  <name>s3native.stream-buffer-size</name>
-  <value>4096</value>
-  <description>The size of buffer to stream files.
-  The size of this buffer should probably be a multiple of hardware
-  page size (4096 on Intel x86), and it determines how much data is
-  buffered during read and write operations.</description>
-</property>
-
-<property>
-  <name>s3native.bytes-per-checksum</name>
-  <value>512</value>
-  <description>The number of bytes per checksum.  Must not be larger than
-  s3native.stream-buffer-size</description>
-</property>
-
-<property>
-  <name>s3native.client-write-packet-size</name>
-  <value>65536</value>
-  <description>Packet size for clients to write</description>
-</property>
-
-<property>
-  <name>s3native.blocksize</name>
-  <value>67108864</value>
-  <description>Block size</description>
-</property>
-
-<property>
-  <name>s3native.replication</name>
-  <value>3</value>
-  <description>Replication factor</description>
-</property>
-
-<!-- FTP file system -->
-<property>
-  <name>ftp.stream-buffer-size</name>
-  <value>4096</value>
-  <description>The size of buffer to stream files.
-  The size of this buffer should probably be a multiple of hardware
-  page size (4096 on Intel x86), and it determines how much data is
-  buffered during read and write operations.</description>
-</property>
-
-<property>
-  <name>ftp.bytes-per-checksum</name>
-  <value>512</value>
-  <description>The number of bytes per checksum.  Must not be larger than
-  ftp.stream-buffer-size</description>
-</property>
-
-<property>
-  <name>ftp.client-write-packet-size</name>
-  <value>65536</value>
-  <description>Packet size for clients to write</description>
-</property>
-
-<property>
-  <name>ftp.blocksize</name>
-  <value>67108864</value>
-  <description>Block size</description>
-</property>
-
-<property>
-  <name>ftp.replication</name>
-  <value>3</value>
-  <description>Replication factor</description>
-</property>
-
-<!-- Tfile -->
-
-<property>
-  <name>tfile.io.chunk.size</name>
-  <value>1048576</value>
-  <description>
-    Value chunk size in bytes. Default  to
-    1MB. Values of the length less than the chunk size is
-    guaranteed to have known value length in read time (See also
-    TFile.Reader.Scanner.Entry.isValueLengthKnown()).
-  </description>
-</property>
-
-<property>
-  <name>tfile.fs.output.buffer.size</name>
-  <value>262144</value>
-  <description>
-    Buffer size used for FSDataOutputStream in bytes.
-  </description>
-</property>
-
-<property>
-  <name>tfile.fs.input.buffer.size</name>
-  <value>262144</value>
-  <description>
-    Buffer size used for FSDataInputStream in bytes.
-  </description>
-</property>
-
-<!-- HTTP web-consoles Authentication -->
-
-<property>
-  <name>hadoop.http.authentication.type</name>
-  <value>simple</value>
-  <description>
-    Defines authentication used for Oozie HTTP endpoint.
-    Supported values are: simple | kerberos | #AUTHENTICATION_HANDLER_CLASSNAME#
-  </description>
-</property>
-
-<property>
-  <name>hadoop.http.authentication.token.validity</name>
-  <value>36000</value>
-  <description>
-    Indicates how long (in seconds) an authentication token is valid before it has
-    to be renewed.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.http.authentication.signature.secret.file</name>
-  <value>${user.home}/hadoop-http-auth-signature-secret</value>
-  <description>
-    The signature secret for signing the authentication tokens.
-    The same secret should be used for JT/NN/DN/TT configurations.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.http.authentication.cookie.domain</name>
-  <value></value>
-  <description>
-    The domain to use for the HTTP cookie that stores the authentication token.
-    In order to authentiation to work correctly across all Hadoop nodes web-consoles
-    the domain must be correctly set.
-    IMPORTANT: when using IP addresses, browsers ignore cookies with domain settings.
-    For this setting to work properly all nodes in the cluster must be configured
-    to generate URLs with hostname.domain names on it.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.http.authentication.simple.anonymous.allowed</name>
-  <value>true</value>
-  <description>
-    Indicates if anonymous requests are allowed when using 'simple' authentication.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.http.authentication.kerberos.principal</name>
-  <value>HTTP/_HOST@LOCALHOST</value>
-  <description>
-    Indicates the Kerberos principal to be used for HTTP endpoint.
-    The principal MUST start with 'HTTP/' as per Kerberos HTTP SPNEGO specification.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.http.authentication.kerberos.keytab</name>
-  <value>${user.home}/hadoop.keytab</value>
-  <description>
-    Location of the keytab file with the credentials for the principal.
-    Referring to the same keytab file Oozie uses for its Kerberos credentials for Hadoop.
-  </description>
-</property>
-
-<!-- HTTP CORS support -->
-<property>
-  <description>Enable/disable the cross-origin (CORS) filter.</description>
-  <name>hadoop.http.cross-origin.enabled</name>
-  <value>false</value>
-</property>
-
-<property>
-  <description>Comma separated list of origins that are allowed for web
-    services needing cross-origin (CORS) support. Wildcards (*) and patterns
-    allowed</description>
-  <name>hadoop.http.cross-origin.allowed-origins</name>
-  <value>*</value>
-</property>
-
-<property>
-  <description>Comma separated list of methods that are allowed for web
-    services needing cross-origin (CORS) support.</description>
-  <name>hadoop.http.cross-origin.allowed-methods</name>
-  <value>GET,POST,HEAD</value>
-</property>
-
-<property>
-  <description>Comma separated list of headers that are allowed for web
-    services needing cross-origin (CORS) support.</description>
-  <name>hadoop.http.cross-origin.allowed-headers</name>
-  <value>X-Requested-With,Content-Type,Accept,Origin</value>
-</property>
-
-<property>
-  <description>The number of seconds a pre-flighted request can be cached
-    for web services needing cross-origin (CORS) support.</description>
-  <name>hadoop.http.cross-origin.max-age</name>
-  <value>1800</value>
-</property>
-
-<property>
-  <name>dfs.ha.fencing.methods</name>
-  <value></value>
-  <description>
-    List of fencing methods to use for service fencing. May contain
-    builtin methods (eg shell and sshfence) or user-defined method.
-  </description>
-</property>
-
-<property>
-  <name>dfs.ha.fencing.ssh.connect-timeout</name>
-  <value>30000</value>
-  <description>
-    SSH connection timeout, in milliseconds, to use with the builtin
-    sshfence fencer.
-  </description>
-</property>
-
-<property>
-  <name>dfs.ha.fencing.ssh.private-key-files</name>
-  <value></value>
-  <description>
-    The SSH private key files to use with the builtin sshfence fencer.
-  </description>
-</property>
-
-
-<!-- Static Web User Filter properties. -->
-<property>
-  <description>
-    The user name to filter as, on static web filters
-    while rendering content. An example use is the HDFS
-    web UI (user to be used for browsing files).
-  </description>
-  <name>hadoop.http.staticuser.user</name>
-  <value>dr.who</value>
-</property>
-
-<property>
-  <name>ha.zookeeper.quorum</name>
-  <description>
-    A list of ZooKeeper server addresses, separated by commas, that are
-    to be used by the ZKFailoverController in automatic failover.
-  </description>
-</property>
-
-<property>
-  <name>ha.zookeeper.session-timeout.ms</name>
-  <value>5000</value>
-  <description>
-    The session timeout to use when the ZKFC connects to ZooKeeper.
-    Setting this value to a lower value implies that server crashes
-    will be detected more quickly, but risks triggering failover too
-    aggressively in the case of a transient error or network blip.
-  </description>
-</property>
-
-<property>
-  <name>ha.zookeeper.parent-znode</name>
-  <value>/hadoop-ha</value>
-  <description>
-    The ZooKeeper znode under which the ZK failover controller stores
-    its information. Note that the nameservice ID is automatically
-    appended to this znode, so it is not normally necessary to
-    configure this, even in a federated environment.
-  </description>
-</property>
-
-<property>
-  <name>ha.zookeeper.acl</name>
-  <value>world:anyone:rwcda</value>
-  <description>
-    A comma-separated list of ZooKeeper ACLs to apply to the znodes
-    used by automatic failover. These ACLs are specified in the same
-    format as used by the ZooKeeper CLI.
-
-    If the ACL itself contains secrets, you may instead specify a
-    path to a file, prefixed with the '@' symbol, and the value of
-    this configuration will be loaded from within.
-  </description>
-</property>
-
-<property>
-  <name>ha.zookeeper.auth</name>
-  <value></value>
-  <description>
-    A comma-separated list of ZooKeeper authentications to add when
-    connecting to ZooKeeper. These are specified in the same format
-    as used by the &quot;addauth&quot; command in the ZK CLI. It is
-    important that the authentications specified here are sufficient
-    to access znodes with the ACL specified in ha.zookeeper.acl.
-
-    If the auths contain secrets, you may instead specify a
-    path to a file, prefixed with the '@' symbol, and the value of
-    this configuration will be loaded from within.
-  </description>
-</property>
-
-<!-- SSLFactory configuration -->
-
-<property>
-  <name>hadoop.ssl.keystores.factory.class</name>
-  <value>org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory</value>
-  <description>
-    The keystores factory to use for retrieving certificates.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.ssl.require.client.cert</name>
-  <value>false</value>
-  <description>Whether client certificates are required</description>
-</property>
-
-<property>
-  <name>hadoop.ssl.hostname.verifier</name>
-  <value>DEFAULT</value>
-  <description>
-    The hostname verifier to provide for HttpsURLConnections.
-    Valid values are: DEFAULT, STRICT, STRICT_I6, DEFAULT_AND_LOCALHOST and
-    ALLOW_ALL
-  </description>
-</property>
-
-<property>
-  <name>hadoop.ssl.server.conf</name>
-  <value>ssl-server.xml</value>
-  <description>
-    Resource file from which ssl server keystore information will be extracted.
-    This file is looked up in the classpath, typically it should be in Hadoop
-    conf/ directory.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.ssl.client.conf</name>
-  <value>ssl-client.xml</value>
-  <description>
-    Resource file from which ssl client keystore information will be extracted
-    This file is looked up in the classpath, typically it should be in Hadoop
-    conf/ directory.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.ssl.enabled</name>
-  <value>false</value>
-  <description>
-    Deprecated. Use dfs.http.policy and yarn.http.policy instead.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.ssl.enabled.protocols</name>
-  <value>TLSv1</value>
-  <description>
-    Protocols supported by the ssl.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.jetty.logs.serve.aliases</name>
-  <value>true</value>
-  <description>
-    Enable/Disable aliases serving from jetty
-  </description>
-</property>
-
-<property>
-  <name>fs.permissions.umask-mode</name>
-  <value>022</value>
-  <description>
-    The umask used when creating files and directories.
-    Can be in octal or in symbolic. Examples are:
-    "022" (octal for u=rwx,g=r-x,o=r-x in symbolic),
-    or "u=rwx,g=rwx,o=" (symbolic for 007 in octal).
-  </description>
-</property>
-
-<!-- ha properties -->
-
-<property>
-  <name>ha.health-monitor.connect-retry-interval.ms</name>
-  <value>1000</value>
-  <description>
-    How often to retry connecting to the service.
-  </description>
-</property>
-
-<property>
-  <name>ha.health-monitor.check-interval.ms</name>
-  <value>1000</value>
-  <description>
-    How often to check the service.
-  </description>
-</property>
-
-<property>
-  <name>ha.health-monitor.sleep-after-disconnect.ms</name>
-  <value>1000</value>
-  <description>
-    How long to sleep after an unexpected RPC error.
-  </description>
-</property>
-
-<property>
-  <name>ha.health-monitor.rpc-timeout.ms</name>
-  <value>45000</value>
-  <description>
-    Timeout for the actual monitorHealth() calls.
-  </description>
-</property>
-
-<property>
-  <name>ha.failover-controller.new-active.rpc-timeout.ms</name>
-  <value>60000</value>
-  <description>
-    Timeout that the FC waits for the new active to become active
-  </description>
-</property>
-
-<property>
-  <name>ha.failover-controller.graceful-fence.rpc-timeout.ms</name>
-  <value>5000</value>
-  <description>
-    Timeout that the FC waits for the old active to go to standby
-  </description>
-</property>
-
-<property>
-  <name>ha.failover-controller.graceful-fence.connection.retries</name>
-  <value>1</value>
-  <description>
-    FC connection retries for graceful fencing
-  </description>
-</property>
-
-<property>
-  <name>ha.failover-controller.cli-check.rpc-timeout.ms</name>
-  <value>20000</value>
-  <description>
-    Timeout that the CLI (manual) FC waits for monitorHealth, getServiceState
-  </description>
-</property>
-
-<property>
-  <name>ipc.client.fallback-to-simple-auth-allowed</name>
-  <value>false</value>
-  <description>
-    When a client is configured to attempt a secure connection, but attempts to
-    connect to an insecure server, that server may instruct the client to
-    switch to SASL SIMPLE (unsecure) authentication. This setting controls
-    whether or not the client will accept this instruction from the server.
-    When false (the default), the client will not allow the fallback to SIMPLE
-    authentication, and will abort the connection.
-  </description>
-</property>
-
-<property>
-  <name>fs.client.resolve.remote.symlinks</name>
-  <value>true</value>
-  <description>
-      Whether to resolve symlinks when accessing a remote Hadoop filesystem.
-      Setting this to false causes an exception to be thrown upon encountering
-      a symlink. This setting does not apply to local filesystems, which
-      automatically resolve local symlinks.
-  </description>
-</property>
-
-<property>
-  <name>nfs.exports.allowed.hosts</name>
-  <value>* rw</value>
-  <description>
-    By default, the export can be mounted by any client. The value string 
-    contains machine name and access privilege, separated by whitespace 
-    characters. The machine name format can be a single host, a Java regular 
-    expression, or an IPv4 address. The access privilege uses rw or ro to 
-    specify read/write or read-only access of the machines to exports. If the 
-    access privilege is not provided, the default is read-only. Entries are separated by ";".
-    For example: "192.168.0.0/22 rw ; host.*\.example\.com ; host1.test.org ro;".
-    Only the NFS gateway needs to restart after this property is updated. 
-  </description>
-</property>
-
-<property>
-  <name>hadoop.user.group.static.mapping.overrides</name>
-  <value>dr.who=;</value>
-  <description>
-    Static mapping of user to groups. This will override the groups if
-    available in the system for the specified user. In otherwords, groups
-    look-up will not happen for these users, instead groups mapped in this
-    configuration will be used.
-    Mapping should be in this format.
-    user1=group1,group2;user2=;user3=group2;
-    Default, "dr.who=;" will consider "dr.who" as user without groups.
-  </description>
-</property>
-
-<property>
-  <name>rpc.metrics.quantile.enable</name>
-  <value>false</value>
-  <description>
-    Setting this property to true and rpc.metrics.percentiles.intervals
-    to a comma-separated list of the granularity in seconds, the
-    50/75/90/95/99th percentile latency for rpc queue/processing time in
-    milliseconds are added to rpc metrics.
-  </description>
-</property>
-
-<property>
-  <name>rpc.metrics.percentiles.intervals</name>
-  <value></value>
-  <description>
-    A comma-separated list of the granularity in seconds for the metrics which
-    describe the 50/75/90/95/99th percentile latency for rpc queue/processing
-    time. The metrics are outputted if rpc.metrics.quantile.enable is set to
-    true.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.crypto.codec.classes.EXAMPLECIPHERSUITE</name>
-  <value></value>
-  <description>
-    The prefix for a given crypto codec, contains a comma-separated
-    list of implementation classes for a given crypto codec (eg EXAMPLECIPHERSUITE).
-    The first implementation will be used if available, others are fallbacks.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.crypto.codec.classes.aes.ctr.nopadding</name>
-  <value>org.apache.hadoop.crypto.OpensslAesCtrCryptoCodec,org.apache.hadoop.crypto.JceAesCtrCryptoCodec</value>
-  <description>
-    Comma-separated list of crypto codec implementations for AES/CTR/NoPadding. 
-    The first implementation will be used if available, others are fallbacks.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.crypto.cipher.suite</name>
-  <value>AES/CTR/NoPadding</value>
-  <description>
-    Cipher suite for crypto codec.
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.crypto.jce.provider</name>
-  <value></value>
-  <description>
-    The JCE provider name used in CryptoCodec. 
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.crypto.buffer.size</name>
-  <value>8192</value>
-  <description>
-    The buffer size used by CryptoInputStream and CryptoOutputStream. 
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.java.secure.random.algorithm</name>
-  <value>SHA1PRNG</value>
-  <description>
-    The java secure random algorithm. 
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.secure.random.impl</name>
-  <value></value>
-  <description>
-    Implementation of secure random. 
-  </description>
-</property>
-
-<property>
-  <name>hadoop.security.random.device.file.path</name>
-  <value>/dev/urandom</value>
-  <description>
-    OS security random device file path.
-  </description>
-</property>
-
-<property>
-  <name>fs.har.impl.disable.cache</name>
-  <value>true</value>
-  <description>Don't cache 'har' filesystem instances.</description>
-</property>
-
-<!--- KMSClientProvider configurations -->
-<property>
-  <name>hadoop.security.kms.client.authentication.retry-count</name>
-  <value>1</value>
-  <description>
-    Number of time to retry connecting to KMS on authentication failure
-  </description>
-</property>
-<property>
-  <name>hadoop.security.kms.client.encrypted.key.cache.size</name>
-  <value>500</value>
-  <description>
-    Size of the EncryptedKeyVersion cache Queue for each key
-  </description>
-</property>
-<property>
-  <name>hadoop.security.kms.client.encrypted.key.cache.low-watermark</name>
-  <value>0.3f</value>
-  <description>
-    If size of the EncryptedKeyVersion cache Queue falls below the
-    low watermark, this cache queue will be scheduled for a refill
-  </description>
-</property>
-<property>
-  <name>hadoop.security.kms.client.encrypted.key.cache.num.refill.threads</name>
-  <value>2</value>
-  <description>
-    Number of threads to use for refilling depleted EncryptedKeyVersion
-    cache Queues
-  </description>
-</property>
-<property>
-  <name>hadoop.security.kms.client.encrypted.key.cache.expiry</name>
-  <value>43200000</value>
-  <description>
-    Cache expiry time for a Key, after which the cache Queue for this
-    key will be dropped. Default = 12hrs
-  </description>
-</property>
-
-<property>
-  <name>hadoop.htrace.spanreceiver.classes</name>
-  <value></value>
-  <description>
-    A comma separated list of the fully-qualified class name of classes 
-    implementing SpanReceiver. The tracing system works by collecting 
-    information in structs called 'Spans'. It is up to you to choose 
-    how you want to receive this information by implementing the 
-    SpanReceiver interface.
-  </description>
-</property>
-
- <property>
-  <name>ipc.server.max.connections</name>
-  <value>0</value>
-  <description>The maximum number of concurrent connections a server is allowed
-    to accept. If this limit is exceeded, incoming connections will first fill
-    the listen queue and then may go to an OS-specific listen overflow queue. 
-    The client may fail or timeout, but the server can avoid running out of file
-    descriptors using this feature. 0 means no limit.
-  </description>
-</property>
-
-
-  <!-- YARN registry -->
-
-  <property>
-    <description>
-      Is the registry enabled in the YARN Resource Manager?
-
-      If true, the YARN RM will, as needed.
-      create the user and system paths, and purge
-      service records when containers, application attempts
-      and applications complete.
-
-      If false, the paths must be created by other means,
-      and no automatic cleanup of service records will take place.
-    </description>
-    <name>hadoop.registry.rm.enabled</name>
-    <value>false</value>
-  </property>
-
-  <property>
-    <description>
-      The root zookeeper node for the registry
-    </description>
-    <name>hadoop.registry.zk.root</name>
-    <value>/registry</value>
-  </property>
-
-  <property>
-    <description>
-      Zookeeper session timeout in milliseconds
-    </description>
-    <name>hadoop.registry.zk.session.timeout.ms</name>
-    <value>60000</value>
-  </property>
-
-  <property>
-    <description>
-      Zookeeper connection timeout in milliseconds
-    </description>
-    <name>hadoop.registry.zk.connection.timeout.ms</name>
-    <value>15000</value>
-  </property>
-
-  <property>
-    <description>
-      Zookeeper connection retry count before failing
-    </description>
-    <name>hadoop.registry.zk.retry.times</name>
-    <value>5</value>
-  </property>
-
-  <property>
-    <description>
-    </description>
-    <name>hadoop.registry.zk.retry.interval.ms</name>
-    <value>1000</value>
-  </property>
-
-  <property>
-    <description>
-      Zookeeper retry limit in milliseconds, during
-      exponential backoff.
-
-      This places a limit even
-      if the retry times and interval limit, combined
-      with the backoff policy, result in a long retry
-      period
-    </description>
-    <name>hadoop.registry.zk.retry.ceiling.ms</name>
-    <value>60000</value>
-  </property>
-
-  <property>
-    <description>
-      List of hostname:port pairs defining the
-      zookeeper quorum binding for the registry
-    </description>
-    <name>hadoop.registry.zk.quorum</name>
-    <value>localhost:2181</value>
-  </property>
-
-  <property>
-    <description>
-      Key to set if the registry is secure. Turning it on
-      changes the permissions policy from "open access"
-      to restrictions on kerberos with the option of
-      a user adding one or more auth key pairs down their
-      own tree.
-    </description>
-    <name>hadoop.registry.secure</name>
-    <value>false</value>
-  </property>
-
-  <property>
-    <description>
-      A comma separated list of Zookeeper ACL identifiers with
-      system access to the registry in a secure cluster.
-
-      These are given full access to all entries.
-
-      If there is an "@" at the end of a SASL entry it
-      instructs the registry client to append the default kerberos domain.
-    </description>
-    <name>hadoop.registry.system.acls</name>
-    <value>sasl:yarn@, sasl:mapred@, sasl:hdfs@</value>
-  </property>
-
-  <property>
-    <description>
-      The kerberos realm: used to set the realm of
-      system principals which do not declare their realm,
-      and any other accounts that need the value.
-
-      If empty, the default realm of the running process
-      is used.
-
-      If neither are known and the realm is needed, then the registry
-      service/client will fail.
-    </description>
-    <name>hadoop.registry.kerberos.realm</name>
-    <value></value>
-  </property>
-
-  <property>
-    <description>
-      Key to define the JAAS context. Used in secure
-      mode
-    </description>
-    <name>hadoop.registry.jaas.context</name>
-    <value>Client</value>
-  </property>
-
-</configuration>
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStorage.java b/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStorage.java
index af80af7ac7f..1549e010fba 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStorage.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStorage.java
@@ -32,6 +32,7 @@
 import java.io.IOException;
 
 import static org.apache.flink.util.Preconditions.checkArgument;
+import static org.apache.flink.util.Preconditions.checkNotNull;
 
 /**
  * An implementation of durable checkpoint storage to file systems.
@@ -54,11 +55,25 @@ public FsCheckpointStorage(
 			JobID jobId,
 			int fileSizeThreshold) throws IOException {
 
+		this(checkpointBaseDirectory.getFileSystem(),
+				checkpointBaseDirectory,
+				defaultSavepointDirectory,
+				jobId,
+				fileSizeThreshold);
+	}
+
+	public FsCheckpointStorage(
+			FileSystem fs,
+			Path checkpointBaseDirectory,
+			@Nullable Path defaultSavepointDirectory,
+			JobID jobId,
+			int fileSizeThreshold) throws IOException {
+
 		super(jobId, defaultSavepointDirectory);
 
 		checkArgument(fileSizeThreshold >= 0);
 
-		this.fileSystem = checkpointBaseDirectory.getFileSystem();
+		this.fileSystem = checkNotNull(fs);
 		this.checkpointsDirectory = getCheckpointDirectoryForJob(checkpointBaseDirectory, jobId);
 		this.sharedStateDirectory = new Path(checkpointsDirectory, CHECKPOINT_SHARED_STATE_DIR);
 		this.taskOwnedStateDirectory = new Path(checkpointsDirectory, CHECKPOINT_TASK_OWNED_STATE_DIR);
diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStreamFactory.java b/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStreamFactory.java
index 609ef698530..228c5b4928b 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStreamFactory.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStreamFactory.java
@@ -21,6 +21,7 @@
 import org.apache.flink.core.fs.FSDataOutputStream;
 import org.apache.flink.core.fs.FileSystem;
 import org.apache.flink.core.fs.Path;
+import org.apache.flink.core.fs.WriteOptions;
 import org.apache.flink.runtime.state.CheckpointStreamFactory;
 import org.apache.flink.runtime.state.CheckpointedStateScope;
 import org.apache.flink.runtime.state.StreamStateHandle;
@@ -345,7 +346,11 @@ private void createStream() throws IOException {
 			for (int attempt = 0; attempt < 10; attempt++) {
 				try {
 					Path statePath = createStatePath();
-					FSDataOutputStream outStream = fs.create(statePath, FileSystem.WriteMode.NO_OVERWRITE);
+					FSDataOutputStream outStream = fs.create(
+							statePath,
+							new WriteOptions()
+									.setOverwrite(FileSystem.WriteMode.NO_OVERWRITE)
+									.setInjectEntropy(true));
 
 					// success, managed to open the stream
 					this.statePath = statePath;
diff --git a/flink-runtime/src/test/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStateOutputStreamTest.java b/flink-runtime/src/test/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStateOutputStreamTest.java
index 8bafdf729af..c9621463cc7 100644
--- a/flink-runtime/src/test/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStateOutputStreamTest.java
+++ b/flink-runtime/src/test/java/org/apache/flink/runtime/state/filesystem/FsCheckpointStateOutputStreamTest.java
@@ -22,6 +22,7 @@
 import org.apache.flink.core.fs.FSDataOutputStream;
 import org.apache.flink.core.fs.FileSystem;
 import org.apache.flink.core.fs.Path;
+import org.apache.flink.core.fs.WriteOptions;
 import org.apache.flink.runtime.state.CheckpointStreamFactory;
 import org.apache.flink.runtime.state.CheckpointStreamFactory.CheckpointStateOutputStream;
 import org.apache.flink.runtime.state.StreamStateHandle;
@@ -138,13 +139,13 @@ public void testGetPos() throws Exception {
 	 */
 	@Test
 	public void testCleanupWhenClosingStream() throws IOException {
-
 		final FileSystem fs = mock(FileSystem.class);
 		final FSDataOutputStream outputStream = mock(FSDataOutputStream.class);
 
 		final ArgumentCaptor<Path> pathCaptor = ArgumentCaptor.forClass(Path.class);
 
 		when(fs.create(pathCaptor.capture(), any(FileSystem.WriteMode.class))).thenReturn(outputStream);
+		when(fs.create(pathCaptor.capture(), any(WriteOptions.class))).thenReturn(outputStream);
 
 		CheckpointStreamFactory.CheckpointStateOutputStream stream = new FsCheckpointStreamFactory.FsCheckpointStateOutputStream(
 			Path.fromLocalFile(tempDir.newFolder()),
@@ -154,9 +155,6 @@ public void testCleanupWhenClosingStream() throws IOException {
 
 		// this should create the underlying file stream
 		stream.write(new byte[] {1, 2, 3, 4, 5});
-
-		verify(fs).create(any(Path.class), any(FileSystem.WriteMode.class));
-
 		stream.close();
 
 		verify(fs).delete(eq(pathCaptor.getValue()), anyBoolean());
@@ -170,9 +168,11 @@ public void testCleanupWhenFailingCloseAndGetHandle() throws IOException {
 		final FileSystem fs = mock(FileSystem.class);
 		final FSDataOutputStream outputStream = mock(FSDataOutputStream.class);
 
-		final ArgumentCaptor<Path>  pathCaptor = ArgumentCaptor.forClass(Path.class);
+		final ArgumentCaptor<Path> pathCaptor = ArgumentCaptor.forClass(Path.class);
 
 		when(fs.create(pathCaptor.capture(), any(FileSystem.WriteMode.class))).thenReturn(outputStream);
+		when(fs.create(pathCaptor.capture(), any(WriteOptions.class))).thenReturn(outputStream);
+
 		doThrow(new IOException("Test IOException.")).when(outputStream).close();
 
 		CheckpointStreamFactory.CheckpointStateOutputStream stream = new FsCheckpointStreamFactory.FsCheckpointStateOutputStream(
@@ -184,8 +184,6 @@ public void testCleanupWhenFailingCloseAndGetHandle() throws IOException {
 		// this should create the underlying file stream
 		stream.write(new byte[] {1, 2, 3, 4, 5});
 
-		verify(fs).create(any(Path.class), any(FileSystem.WriteMode.class));
-
 		try {
 			stream.closeAndGetHandle();
 			fail("Expected IOException");
diff --git a/flink-runtime/src/test/java/org/apache/flink/runtime/state/filesystem/FsStateBackendEntropyTest.java b/flink-runtime/src/test/java/org/apache/flink/runtime/state/filesystem/FsStateBackendEntropyTest.java
new file mode 100644
index 00000000000..d1aa11844dd
--- /dev/null
+++ b/flink-runtime/src/test/java/org/apache/flink/runtime/state/filesystem/FsStateBackendEntropyTest.java
@@ -0,0 +1,99 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.state.filesystem;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.core.fs.FileSystem;
+import org.apache.flink.core.fs.Path;
+import org.apache.flink.core.fs.WriteOptions;
+import org.apache.flink.core.fs.local.LocalFileSystem;
+import org.apache.flink.runtime.state.CheckpointMetadataOutputStream;
+import org.apache.flink.runtime.state.CheckpointStorageLocation;
+import org.apache.flink.runtime.state.CheckpointStreamFactory.CheckpointStateOutputStream;
+import org.apache.flink.runtime.state.CheckpointedStateScope;
+
+import org.junit.After;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.mockito.ArgumentCaptor;
+
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.reset;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Tests verifying that the FsStateBackend passes the entropy injection option
+ * to the FileSystem for state payload files, but not for metadata files.
+ */
+public class FsStateBackendEntropyTest {
+
+	@Rule
+	public final TemporaryFolder tmp = new TemporaryFolder();
+
+	@After
+	public void resetFileSystems() throws Exception {
+		FileSystem.initialize(new Configuration());
+	}
+
+	@Test
+	public void testInjection() throws Exception {
+		FileSystem fs = spy(LocalFileSystem.getSharedInstance());
+		ArgumentCaptor<WriteOptions> optionsCaptor = ArgumentCaptor.forClass(WriteOptions.class);
+
+		Path checkpointDir = Path.fromLocalFile(tmp.newFolder());
+
+		FsCheckpointStorage storage = new FsCheckpointStorage(
+				fs, checkpointDir, null, new JobID(), 1024);
+
+		CheckpointStorageLocation location = storage.initializeLocationForCheckpoint(96562);
+
+		// check entropy in task-owned state
+		try (CheckpointStateOutputStream stream = storage.createTaskOwnedStateStream()) {
+			stream.flush();
+		}
+
+		verify(fs, times(1)).create(any(Path.class), optionsCaptor.capture());
+		assertTrue(optionsCaptor.getValue().isInjectEntropy());
+		reset(fs);
+
+		// check entropy in the exclusive/shared state
+		try (CheckpointStateOutputStream stream =
+				location.createCheckpointStateOutputStream(CheckpointedStateScope.EXCLUSIVE)) {
+
+			stream.flush();
+		}
+
+		verify(fs, times(1)).create(any(Path.class), optionsCaptor.capture());
+		assertTrue(optionsCaptor.getValue().isInjectEntropy());
+		reset(fs);
+
+		// check that there is no entropy in the metadata
+		// check entropy in the exclusive/shared state
+		try (CheckpointMetadataOutputStream stream = location.createMetadataOutputStream()) {
+			stream.flush();
+		}
+
+		verify(fs, times(0)).create(any(Path.class), any(WriteOptions.class));
+	}
+}


 

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