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From ste...@apache.org
Subject [1/2] hadoop git commit: HADOOP-13972. ADLS to support per-store configuration. Contributed by Sharad Sonker.
Date Thu, 15 Feb 2018 16:27:41 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-3.1 96c047fbb -> 050f5287b
  refs/heads/trunk 9a013b255 -> 481d79fed


HADOOP-13972. ADLS to support per-store configuration.
Contributed by Sharad Sonker.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/050f5287
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/050f5287
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/050f5287

Branch: refs/heads/branch-3.1
Commit: 050f5287b79324b7f6231b879c0bfc608203b980
Parents: 96c047f
Author: Steve Loughran <stevel@apache.org>
Authored: Thu Feb 15 16:25:55 2018 +0000
Committer: Steve Loughran <stevel@apache.org>
Committed: Thu Feb 15 16:25:55 2018 +0000

----------------------------------------------------------------------
 .../org/apache/hadoop/fs/adl/AdlConfKeys.java   |   5 +
 .../org/apache/hadoop/fs/adl/AdlFileSystem.java |  81 +++++++++-
 .../src/site/markdown/index.md                  |  37 +++++
 .../fs/adl/TestValidateConfiguration.java       | 152 +++++++++++++++----
 .../hadoop/fs/adl/common/Parallelized.java      |   2 +-
 5 files changed, 239 insertions(+), 38 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/050f5287/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlConfKeys.java
----------------------------------------------------------------------
diff --git a/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlConfKeys.java
b/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlConfKeys.java
index 790902c..e3a4ad6 100644
--- a/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlConfKeys.java
+++ b/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlConfKeys.java
@@ -33,6 +33,11 @@ public final class AdlConfKeys {
   public static final String AZURE_AD_REFRESH_URL_KEY =
       "fs.adl.oauth2.refresh.url";
 
+  public static final String AZURE_AD_ACCOUNT_PREFIX =
+          "fs.adl.account.";
+  public static final String AZURE_AD_PREFIX =
+          "fs.adl.";
+
   // optional when provider type is refresh or client id.
   public static final String AZURE_AD_TOKEN_PROVIDER_CLASS_KEY =
       "fs.adl.oauth2.access.token.provider";

http://git-wip-us.apache.org/repos/asf/hadoop/blob/050f5287/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlFileSystem.java
----------------------------------------------------------------------
diff --git a/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlFileSystem.java
b/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlFileSystem.java
index a496595..9f54a36 100644
--- a/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlFileSystem.java
+++ b/hadoop-tools/hadoop-azure-datalake/src/main/java/org/apache/hadoop/fs/adl/AdlFileSystem.java
@@ -24,8 +24,10 @@ import java.net.URI;
 import java.util.ArrayList;
 import java.util.EnumSet;
 import java.util.List;
+import java.util.Map;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
 import com.microsoft.azure.datalake.store.ADLStoreClient;
 import com.microsoft.azure.datalake.store.ADLStoreOptions;
 import com.microsoft.azure.datalake.store.DirectoryEntry;
@@ -37,6 +39,8 @@ import com.microsoft.azure.datalake.store.oauth2.ClientCredsTokenProvider;
 import com.microsoft.azure.datalake.store.oauth2.DeviceCodeTokenProvider;
 import com.microsoft.azure.datalake.store.oauth2.MsiTokenProvider;
 import com.microsoft.azure.datalake.store.oauth2.RefreshTokenBasedTokenProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import org.apache.commons.lang.StringUtils;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -74,6 +78,8 @@ import static org.apache.hadoop.fs.adl.AdlConfKeys.*;
 @InterfaceAudience.Public
 @InterfaceStability.Evolving
 public class AdlFileSystem extends FileSystem {
+  private static final Logger LOG =
+      LoggerFactory.getLogger(AdlFileSystem.class);
   public static final String SCHEME = "adl";
   static final int DEFAULT_PORT = 443;
   private URI uri;
@@ -115,12 +121,19 @@ public class AdlFileSystem extends FileSystem {
   /**
    * Called after a new FileSystem instance is constructed.
    *
-   * @param storeUri a uri whose authority section names the host, port, etc.
-   *                 for this FileSystem
-   * @param conf     the configuration
+   * @param storeUri      a uri whose authority section names the host, port,
+   *                      etc. for this FileSystem
+   * @param originalConf  the configuration to use for the FS. The account-
+   *                      specific options are patched over the base ones
+   *                      before any use is made of the config.
    */
   @Override
-  public void initialize(URI storeUri, Configuration conf) throws IOException {
+  public void initialize(URI storeUri, Configuration originalConf)
+      throws IOException {
+    String hostname = storeUri.getHost();
+    String accountName = getAccountNameFromFQDN(hostname);
+    Configuration conf = propagateAccountOptions(originalConf, accountName);
+
     super.initialize(storeUri, conf);
     this.setConf(conf);
     this.uri = URI
@@ -144,7 +157,6 @@ public class AdlFileSystem extends FileSystem {
 
     String accountFQDN = null;
     String mountPoint = null;
-    String hostname = storeUri.getHost();
     if (!hostname.contains(".") && !hostname.equalsIgnoreCase(
         "localhost")) {  // this is a symbolic name. Resolve it.
       String hostNameProperty = "dfs.adls." + hostname + ".hostname";
@@ -985,4 +997,63 @@ public class AdlFileSystem extends FileSystem {
     oidOrUpn = enableUPN ? UserGroupRepresentation.UPN :
         UserGroupRepresentation.OID;
   }
+
+  /**
+   * Gets ADL account name from ADL FQDN.
+   * @param accountFQDN ADL account fqdn
+   * @return ADL account name
+   */
+  public static String getAccountNameFromFQDN(String accountFQDN) {
+    return accountFQDN.contains(".")
+            ? accountFQDN.substring(0, accountFQDN.indexOf("."))
+            : accountFQDN;
+  }
+
+  /**
+   * Propagates account-specific settings into generic ADL configuration keys.
+   * This is done by propagating the values of the form
+   * {@code fs.adl.account.${account_name}.key} to
+   * {@code fs.adl.key}, for all values of "key"
+   *
+   * The source of the updated property is set to the key name of the account
+   * property, to aid in diagnostics of where things came from.
+   *
+   * Returns a new configuration. Why the clone?
+   * You can use the same conf for different filesystems, and the original
+   * values are not updated.
+   *
+   *
+   * @param source Source Configuration object
+   * @param accountName account name. Must not be empty
+   * @return a (potentially) patched clone of the original
+   */
+  public static Configuration propagateAccountOptions(Configuration source,
+      String accountName) {
+
+    Preconditions.checkArgument(StringUtils.isNotEmpty(accountName),
+        "accountName");
+    final String accountPrefix = AZURE_AD_ACCOUNT_PREFIX + accountName +'.';
+    LOG.debug("Propagating entries under {}", accountPrefix);
+    final Configuration dest = new Configuration(source);
+    for (Map.Entry<String, String> entry : source) {
+      final String key = entry.getKey();
+      // get the (unexpanded) value.
+      final String value = entry.getValue();
+      if (!key.startsWith(accountPrefix) || accountPrefix.equals(key)) {
+        continue;
+      }
+      // there's a account prefix, so strip it
+      final String stripped = key.substring(accountPrefix.length());
+
+      // propagate the value, building a new origin field.
+      // to track overwrites, the generic key is overwritten even if
+      // already matches the new one.
+      String origin = "[" + StringUtils.join(
+              source.getPropertySources(key), ", ") +"]";
+      final String generic = AZURE_AD_PREFIX + stripped;
+      LOG.debug("Updating {} from {}", generic, origin);
+      dest.set(generic, value, key + " via " + origin);
+    }
+    return dest;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/050f5287/hadoop-tools/hadoop-azure-datalake/src/site/markdown/index.md
----------------------------------------------------------------------
diff --git a/hadoop-tools/hadoop-azure-datalake/src/site/markdown/index.md b/hadoop-tools/hadoop-azure-datalake/src/site/markdown/index.md
index d2b6edf..ad2a983 100644
--- a/hadoop-tools/hadoop-azure-datalake/src/site/markdown/index.md
+++ b/hadoop-tools/hadoop-azure-datalake/src/site/markdown/index.md
@@ -36,6 +36,7 @@ This support comes via the JAR file `azure-datalake-store.jar`.
 * Tested for scale.
 * API `setOwner()`, `setAcl`, `removeAclEntries()`, `modifyAclEntries()` accepts UPN or OID
   (Object ID) as user and group names.
+* Supports per-account configuration.
 
 ## Limitations
 
@@ -328,6 +329,42 @@ Add the following properties to `core-site.xml`
   </description>
 </property>
 ```
+## Configurations for different ADL accounts
+Different ADL accounts can be accessed with different ADL client configurations.
+This also allows for different login details.
+
+1. All `fs.adl` options can be set on a per account basis.
+1. The account specific option is set by replacing the `fs.adl.` prefix on an option
+with `fs.adl.account.ACCOUNTNAME.`, where `ACCOUNTNAME` is the name of the account.
+1. When connecting to an account, all options explicitly set will override
+the base `fs.adl.` values.
+
+As an example, a configuration could have a base configuration to use the public account
+`adl://<some-public-account>.azuredatalakestore.net/` and an account-specific configuration
+to use some private account `adl://myprivateaccount.azuredatalakestore.net/`
+
+```xml
+<property>
+  <name>fs.adl.oauth2.client.id</name>
+  <value>CLIENTID</value>
+</property>
+
+<property>
+  <name>fs.adl.oauth2.credential</name>
+  <value>CREDENTIAL</value>
+</property>
+
+<property>
+  <name>fs.adl.account.myprivateaccount.oauth2.client.id</name>
+  <value>CLIENTID1</value>
+</property>
+
+<property>
+  <name>fs.adl.account.myprivateaccount.oauth2.credential</name>
+  <value>CREDENTIAL1</value>
+</property>
+```
+
 ## Testing the azure-datalake-store Module
 The `hadoop-azure` module includes a full suite of unit tests.
 Most of the tests will run without additional configuration by running `mvn test`.

http://git-wip-us.apache.org/repos/asf/hadoop/blob/050f5287/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/TestValidateConfiguration.java
----------------------------------------------------------------------
diff --git a/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/TestValidateConfiguration.java
b/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/TestValidateConfiguration.java
index 3d51b42..0308a69 100644
--- a/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/TestValidateConfiguration.java
+++ b/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/TestValidateConfiguration.java
@@ -20,7 +20,6 @@ package org.apache.hadoop.fs.adl;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.test.GenericTestUtils;
-import org.junit.Assert;
 import org.junit.Test;
 
 import static org.apache.hadoop.fs.adl.AdlConfKeys.ADL_BLOCK_SIZE;
@@ -58,6 +57,8 @@ import static org.apache.hadoop.fs.adl.AdlConfKeys
     .TOKEN_PROVIDER_TYPE_REFRESH_TOKEN;
 import static org.apache.hadoop.fs.adl.AdlConfKeys.WRITE_BUFFER_SIZE_KEY;
 
+import static org.junit.Assert.assertEquals;
+
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -70,50 +71,48 @@ public class TestValidateConfiguration {
 
   @Test
   public void validateConfigurationKeys() {
-    Assert
-        .assertEquals("fs.adl.oauth2.refresh.url", AZURE_AD_REFRESH_URL_KEY);
-    Assert.assertEquals("fs.adl.oauth2.access.token.provider",
+    assertEquals("fs.adl.oauth2.refresh.url", AZURE_AD_REFRESH_URL_KEY);
+    assertEquals("fs.adl.oauth2.access.token.provider",
         AZURE_AD_TOKEN_PROVIDER_CLASS_KEY);
-    Assert.assertEquals("fs.adl.oauth2.client.id", AZURE_AD_CLIENT_ID_KEY);
-    Assert.assertEquals("fs.adl.oauth2.refresh.token",
+    assertEquals("fs.adl.oauth2.client.id", AZURE_AD_CLIENT_ID_KEY);
+    assertEquals("fs.adl.oauth2.refresh.token",
         AZURE_AD_REFRESH_TOKEN_KEY);
-    Assert
-        .assertEquals("fs.adl.oauth2.credential", AZURE_AD_CLIENT_SECRET_KEY);
-    Assert.assertEquals("adl.debug.override.localuserasfileowner",
+    assertEquals("fs.adl.oauth2.credential", AZURE_AD_CLIENT_SECRET_KEY);
+    assertEquals("adl.debug.override.localuserasfileowner",
         ADL_DEBUG_OVERRIDE_LOCAL_USER_AS_OWNER);
 
-    Assert.assertEquals("fs.adl.oauth2.access.token.provider.type",
+    assertEquals("fs.adl.oauth2.access.token.provider.type",
         AZURE_AD_TOKEN_PROVIDER_TYPE_KEY);
 
-    Assert.assertEquals("adl.feature.client.cache.readahead",
+    assertEquals("adl.feature.client.cache.readahead",
         READ_AHEAD_BUFFER_SIZE_KEY);
 
-    Assert.assertEquals("adl.feature.client.cache.drop.behind.writes",
+    assertEquals("adl.feature.client.cache.drop.behind.writes",
         WRITE_BUFFER_SIZE_KEY);
 
-    Assert.assertEquals("RefreshToken", TOKEN_PROVIDER_TYPE_REFRESH_TOKEN);
+    assertEquals("RefreshToken", TOKEN_PROVIDER_TYPE_REFRESH_TOKEN);
 
-    Assert.assertEquals("ClientCredential", TOKEN_PROVIDER_TYPE_CLIENT_CRED);
+    assertEquals("ClientCredential", TOKEN_PROVIDER_TYPE_CLIENT_CRED);
 
-    Assert.assertEquals("adl.enable.client.latency.tracker",
+    assertEquals("adl.enable.client.latency.tracker",
         LATENCY_TRACKER_KEY);
 
-    Assert.assertEquals(true, LATENCY_TRACKER_DEFAULT);
+    assertEquals(true, LATENCY_TRACKER_DEFAULT);
 
-    Assert.assertEquals(true, ADL_EXPERIMENT_POSITIONAL_READ_DEFAULT);
+    assertEquals(true, ADL_EXPERIMENT_POSITIONAL_READ_DEFAULT);
 
-    Assert.assertEquals("adl.feature.experiment.positional.read.enable",
+    assertEquals("adl.feature.experiment.positional.read.enable",
         ADL_EXPERIMENT_POSITIONAL_READ_KEY);
 
-    Assert.assertEquals(1, ADL_REPLICATION_FACTOR);
-    Assert.assertEquals(256 * 1024 * 1024, ADL_BLOCK_SIZE);
-    Assert.assertEquals(false, ADL_DEBUG_SET_LOCAL_USER_AS_OWNER_DEFAULT);
-    Assert.assertEquals(4 * 1024 * 1024, DEFAULT_READ_AHEAD_BUFFER_SIZE);
-    Assert.assertEquals(4 * 1024 * 1024, DEFAULT_WRITE_AHEAD_BUFFER_SIZE);
+    assertEquals(1, ADL_REPLICATION_FACTOR);
+    assertEquals(256 * 1024 * 1024, ADL_BLOCK_SIZE);
+    assertEquals(false, ADL_DEBUG_SET_LOCAL_USER_AS_OWNER_DEFAULT);
+    assertEquals(4 * 1024 * 1024, DEFAULT_READ_AHEAD_BUFFER_SIZE);
+    assertEquals(4 * 1024 * 1024, DEFAULT_WRITE_AHEAD_BUFFER_SIZE);
 
-    Assert.assertEquals("adl.feature.ownerandgroup.enableupn",
+    assertEquals("adl.feature.ownerandgroup.enableupn",
         ADL_ENABLEUPN_FOR_OWNERGROUP_KEY);
-    Assert.assertEquals(false,
+    assertEquals(false,
         ADL_ENABLEUPN_FOR_OWNERGROUP_DEFAULT);
   }
 
@@ -152,6 +151,95 @@ public class TestValidateConfiguration {
     assertDeprecatedKeys(conf);
   }
 
+  @Test
+  public void testGetAccountNameFromFQDN() {
+    assertEquals("dummy", AdlFileSystem.
+        getAccountNameFromFQDN("dummy.azuredatalakestore.net"));
+    assertEquals("localhost", AdlFileSystem.
+        getAccountNameFromFQDN("localhost"));
+  }
+
+  @Test
+  public void testPropagateAccountOptionsDefault() {
+    Configuration conf = new Configuration(false);
+    conf.set("fs.adl.oauth2.client.id", "defaultClientId");
+    conf.set("fs.adl.oauth2.credential", "defaultCredential");
+    conf.set("some.other.config", "someValue");
+    Configuration propagatedConf =
+        AdlFileSystem.propagateAccountOptions(conf, "dummy");
+    assertEquals("defaultClientId",
+        propagatedConf.get(AZURE_AD_CLIENT_ID_KEY));
+    assertEquals("defaultCredential",
+        propagatedConf.get(AZURE_AD_CLIENT_SECRET_KEY));
+    assertEquals("someValue",
+        propagatedConf.get("some.other.config"));
+  }
+
+  @Test
+  public void testPropagateAccountOptionsSpecified() {
+    Configuration conf = new Configuration(false);
+    conf.set("fs.adl.account.dummy.oauth2.client.id", "dummyClientId");
+    conf.set("fs.adl.account.dummy.oauth2.credential", "dummyCredential");
+    conf.set("some.other.config", "someValue");
+
+    Configuration propagatedConf =
+        AdlFileSystem.propagateAccountOptions(conf, "dummy");
+    assertEquals("dummyClientId",
+        propagatedConf.get(AZURE_AD_CLIENT_ID_KEY));
+    assertEquals("dummyCredential",
+        propagatedConf.get(AZURE_AD_CLIENT_SECRET_KEY));
+    assertEquals("someValue",
+        propagatedConf.get("some.other.config"));
+
+    propagatedConf =
+        AdlFileSystem.propagateAccountOptions(conf, "anotherDummy");
+    assertEquals(null,
+        propagatedConf.get(AZURE_AD_CLIENT_ID_KEY));
+    assertEquals(null,
+        propagatedConf.get(AZURE_AD_CLIENT_SECRET_KEY));
+    assertEquals("someValue",
+        propagatedConf.get("some.other.config"));
+  }
+
+  @Test
+  public void testPropagateAccountOptionsAll() {
+    Configuration conf = new Configuration(false);
+    conf.set("fs.adl.oauth2.client.id", "defaultClientId");
+    conf.set("fs.adl.oauth2.credential", "defaultCredential");
+    conf.set("some.other.config", "someValue");
+    conf.set("fs.adl.account.dummy1.oauth2.client.id", "dummyClientId1");
+    conf.set("fs.adl.account.dummy1.oauth2.credential", "dummyCredential1");
+    conf.set("fs.adl.account.dummy2.oauth2.client.id", "dummyClientId2");
+    conf.set("fs.adl.account.dummy2.oauth2.credential", "dummyCredential2");
+
+    Configuration propagatedConf =
+        AdlFileSystem.propagateAccountOptions(conf, "dummy1");
+    assertEquals("dummyClientId1",
+        propagatedConf.get(AZURE_AD_CLIENT_ID_KEY));
+    assertEquals("dummyCredential1",
+        propagatedConf.get(AZURE_AD_CLIENT_SECRET_KEY));
+    assertEquals("someValue",
+        propagatedConf.get("some.other.config"));
+
+    propagatedConf =
+        AdlFileSystem.propagateAccountOptions(conf, "dummy2");
+    assertEquals("dummyClientId2",
+        propagatedConf.get(AZURE_AD_CLIENT_ID_KEY));
+    assertEquals("dummyCredential2",
+        propagatedConf.get(AZURE_AD_CLIENT_SECRET_KEY));
+    assertEquals("someValue",
+        propagatedConf.get("some.other.config"));
+
+    propagatedConf =
+        AdlFileSystem.propagateAccountOptions(conf, "anotherDummy");
+    assertEquals("defaultClientId",
+        propagatedConf.get(AZURE_AD_CLIENT_ID_KEY));
+    assertEquals("defaultCredential",
+        propagatedConf.get(AZURE_AD_CLIENT_SECRET_KEY));
+    assertEquals("someValue",
+        propagatedConf.get("some.other.config"));
+  }
+
   private void setDeprecatedKeys(Configuration conf) {
     conf.set("dfs.adls.oauth2.access.token.provider.type", "dummyType");
     conf.set("dfs.adls.oauth2.client.id", "dummyClientId");
@@ -163,19 +251,19 @@ public class TestValidateConfiguration {
   }
 
   private void assertDeprecatedKeys(Configuration conf) {
-    Assert.assertEquals("dummyType",
+    assertEquals("dummyType",
         conf.get(AZURE_AD_TOKEN_PROVIDER_TYPE_KEY));
-    Assert.assertEquals("dummyClientId",
+    assertEquals("dummyClientId",
         conf.get(AZURE_AD_CLIENT_ID_KEY));
-    Assert.assertEquals("dummyRefreshToken",
+    assertEquals("dummyRefreshToken",
         conf.get(AZURE_AD_REFRESH_TOKEN_KEY));
-    Assert.assertEquals("dummyRefreshUrl",
+    assertEquals("dummyRefreshUrl",
         conf.get(AZURE_AD_REFRESH_URL_KEY));
-    Assert.assertEquals("dummyCredential",
+    assertEquals("dummyCredential",
         conf.get(AZURE_AD_CLIENT_SECRET_KEY));
-    Assert.assertEquals("dummyClass",
+    assertEquals("dummyClass",
         conf.get(AZURE_AD_TOKEN_PROVIDER_CLASS_KEY));
-    Assert.assertEquals("dummyTracker",
+    assertEquals("dummyTracker",
         conf.get(LATENCY_TRACKER_KEY));
   }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/050f5287/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/common/Parallelized.java
----------------------------------------------------------------------
diff --git a/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/common/Parallelized.java
b/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/common/Parallelized.java
index b08a892..7ac010c 100644
--- a/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/common/Parallelized.java
+++ b/hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/common/Parallelized.java
@@ -39,7 +39,7 @@ public class Parallelized extends Parameterized {
   private static class ThreadPoolScheduler implements RunnerScheduler {
     private ExecutorService executor;
 
-    public ThreadPoolScheduler() {
+    ThreadPoolScheduler() {
       int numThreads = 10;
       executor = Executors.newFixedThreadPool(numThreads);
     }


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