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From jiten...@apache.org
Subject hadoop git commit: HDFS-8855. Webhdfs client leaks active NameNode connections. Contributed by Xiaobing Zhou.
Date Tue, 13 Oct 2015 16:13:19 GMT
Repository: hadoop
Updated Branches:
  refs/heads/trunk 5b43db47a -> 84cbd72af


HDFS-8855. Webhdfs client leaks active NameNode connections. Contributed by Xiaobing Zhou.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/84cbd72a
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/84cbd72a
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/84cbd72a

Branch: refs/heads/trunk
Commit: 84cbd72afda6344e220526fac5c560f00f84e374
Parents: 5b43db4
Author: Jitendra Pandey <jitendra@apache.org>
Authored: Tue Oct 13 09:12:04 2015 -0700
Committer: Jitendra Pandey <jitendra@apache.org>
Committed: Tue Oct 13 09:12:04 2015 -0700

----------------------------------------------------------------------
 .../org/apache/hadoop/security/token/Token.java |  11 +-
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt     |   3 +
 .../org/apache/hadoop/hdfs/DFSConfigKeys.java   |   4 +
 .../web/webhdfs/DataNodeUGIProvider.java        | 106 +++++++--
 .../datanode/web/webhdfs/WebHdfsHandler.java    |   2 +-
 .../src/main/resources/hdfs-default.xml         |   8 +
 .../web/webhdfs/TestDataNodeUGIProvider.java    | 231 +++++++++++++++++++
 7 files changed, 346 insertions(+), 19 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/84cbd72a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
index 2420155..f189a96 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java
@@ -19,6 +19,8 @@
 package org.apache.hadoop.security.token;
 
 import com.google.common.collect.Maps;
+import com.google.common.primitives.Bytes;
+
 import org.apache.commons.codec.binary.Base64;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -29,9 +31,11 @@ import org.apache.hadoop.io.*;
 import org.apache.hadoop.util.ReflectionUtils;
 
 import java.io.*;
+import java.nio.ByteBuffer;
 import java.util.Arrays;
 import java.util.Map;
 import java.util.ServiceLoader;
+import java.util.UUID;
 
 /**
  * The client-side form of the token.
@@ -337,7 +341,12 @@ public class Token<T extends TokenIdentifier> implements Writable
{
     identifierToString(buffer);
     return buffer.toString();
   }
-  
+
+  public String buildCacheKey() {
+    return UUID.nameUUIDFromBytes(
+        Bytes.concat(kind.getBytes(), identifier, password)).toString();
+  }
+
   private static ServiceLoader<TokenRenewer> renewers =
       ServiceLoader.load(TokenRenewer.class);
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/84cbd72a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index d7b6bd3..9751a3a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -2033,6 +2033,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9160. [OIV-Doc] : Missing details of 'delimited' for processor options
     (nijel via vinayakumarb)
 
+    HDFS-8855. Webhdfs client leaks active NameNode connections.
+    (Xiaobing Zhou via jitendra) 
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

http://git-wip-us.apache.org/repos/asf/hadoop/blob/84cbd72a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
index 8510c9a..cb05fa9 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
@@ -70,6 +70,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String  DFS_WEBHDFS_NETTY_HIGH_WATERMARK =
       "dfs.webhdfs.netty.high.watermark";
   public static final int  DFS_WEBHDFS_NETTY_HIGH_WATERMARK_DEFAULT = 65535;
+  public static final String  DFS_WEBHDFS_UGI_EXPIRE_AFTER_ACCESS_KEY =
+      "dfs.webhdfs.ugi.expire.after.access";
+  public static final int     DFS_WEBHDFS_UGI_EXPIRE_AFTER_ACCESS_DEFAULT =
+      10*60*1000; //10 minutes
 
   // HA related configuration
   public static final String  DFS_DATANODE_RESTART_REPLICA_EXPIRY_KEY = "dfs.datanode.restart.replica.expiration";

http://git-wip-us.apache.org/repos/asf/hadoop/blob/84cbd72a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/DataNodeUGIProvider.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/DataNodeUGIProvider.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/DataNodeUGIProvider.java
index ea1c29f..064def8 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/DataNodeUGIProvider.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/DataNodeUGIProvider.java
@@ -13,14 +13,26 @@
  */
 package org.apache.hadoop.hdfs.server.datanode.web.webhdfs;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.apache.hadoop.hdfs.server.common.JspHelper;
+import org.apache.hadoop.io.WritableComparator;
+import org.apache.hadoop.ipc.Client;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+
 import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 import java.io.IOException;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
 
 /**
  * Create UGI from the request for the WebHDFS requests for the DNs. Note that
@@ -29,34 +41,75 @@ import java.io.IOException;
  */
 class DataNodeUGIProvider {
   private final ParameterParser params;
+  private static Cache<String, UserGroupInformation> ugiCache;
+  public static final Log LOG = LogFactory.getLog(Client.class);
 
-  DataNodeUGIProvider(ParameterParser params) {
+  DataNodeUGIProvider(ParameterParser params, Configuration conf) {
     this.params = params;
+    if (ugiCache == null) {
+      synchronized (DataNodeUGIProvider.class) {
+        if (ugiCache == null) {
+          ugiCache = CacheBuilder
+              .newBuilder()
+              .expireAfterAccess(
+                  conf.getInt(
+                      DFSConfigKeys.DFS_WEBHDFS_UGI_EXPIRE_AFTER_ACCESS_KEY,
+                      DFSConfigKeys.DFS_WEBHDFS_UGI_EXPIRE_AFTER_ACCESS_DEFAULT),
+                  TimeUnit.MILLISECONDS).build();
+        }
+      }
+    }
   }
 
   UserGroupInformation ugi() throws IOException {
-    if (UserGroupInformation.isSecurityEnabled()) {
-      return tokenUGI();
-    }
+    UserGroupInformation ugi;
 
-    final String usernameFromQuery = params.userName();
-    final String doAsUserFromQuery = params.doAsUser();
-    final String remoteUser = usernameFromQuery == null
-        ? JspHelper.getDefaultWebUserName(params.conf()) // not specified in
-        // request
-        : usernameFromQuery;
+    try {
+      if (UserGroupInformation.isSecurityEnabled()) {
+        final Token<DelegationTokenIdentifier> token = params.delegationToken();
 
-    UserGroupInformation ugi = UserGroupInformation.createRemoteUser(remoteUser);
-    JspHelper.checkUsername(ugi.getShortUserName(), usernameFromQuery);
-    if (doAsUserFromQuery != null) {
-      // create and attempt to authorize a proxy user
-      ugi = UserGroupInformation.createProxyUser(doAsUserFromQuery, ugi);
+        ugi = ugiCache.get(buildTokenCacheKey(token),
+            new Callable<UserGroupInformation>() {
+              @Override
+              public UserGroupInformation call() throws Exception {
+                return tokenUGI(token);
+              }
+            });
+      } else {
+        final String usernameFromQuery = params.userName();
+        final String doAsUserFromQuery = params.doAsUser();
+        final String remoteUser = usernameFromQuery == null ? JspHelper
+            .getDefaultWebUserName(params.conf()) // not specified in request
+            : usernameFromQuery;
+
+        ugi = ugiCache.get(
+            buildNonTokenCacheKey(doAsUserFromQuery, remoteUser),
+            new Callable<UserGroupInformation>() {
+              @Override
+              public UserGroupInformation call() throws Exception {
+                return nonTokenUGI(usernameFromQuery, doAsUserFromQuery,
+                    remoteUser);
+              }
+            });
+      }
+    } catch (ExecutionException e) {
+      Throwable cause = e.getCause();
+      if (cause instanceof IOException) {
+        throw (IOException) cause;
+      } else {
+        throw new IOException(cause);
+      }
     }
+
     return ugi;
   }
 
-  private UserGroupInformation tokenUGI() throws IOException {
-    Token<DelegationTokenIdentifier> token = params.delegationToken();
+  private String buildTokenCacheKey(Token<DelegationTokenIdentifier> token) {
+    return token.buildCacheKey();
+  }
+
+  private UserGroupInformation tokenUGI(Token<DelegationTokenIdentifier> token)
+      throws IOException {
     ByteArrayInputStream buf =
       new ByteArrayInputStream(token.getIdentifier());
     DataInputStream in = new DataInputStream(buf);
@@ -67,4 +120,23 @@ class DataNodeUGIProvider {
     return ugi;
   }
 
+  private String buildNonTokenCacheKey(String doAsUserFromQuery,
+      String remoteUser) throws IOException {
+    String key = doAsUserFromQuery == null ? String.format("{%s}", remoteUser)
+        : String.format("{%s}:{%s}", remoteUser, doAsUserFromQuery);
+    return key;
+  }
+
+  private UserGroupInformation nonTokenUGI(String usernameFromQuery,
+      String doAsUserFromQuery, String remoteUser) throws IOException {
+
+    UserGroupInformation ugi = UserGroupInformation
+        .createRemoteUser(remoteUser);
+    JspHelper.checkUsername(ugi.getShortUserName(), usernameFromQuery);
+    if (doAsUserFromQuery != null) {
+      // create and attempt to authorize a proxy user
+      ugi = UserGroupInformation.createProxyUser(doAsUserFromQuery, ugi);
+    }
+    return ugi;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/84cbd72a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/WebHdfsHandler.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/WebHdfsHandler.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/WebHdfsHandler.java
index dffe34d..f8ddce1 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/WebHdfsHandler.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/WebHdfsHandler.java
@@ -107,7 +107,7 @@ public class WebHdfsHandler extends SimpleChannelInboundHandler<HttpRequest>
{
     Preconditions.checkArgument(req.uri().startsWith(WEBHDFS_PREFIX));
     QueryStringDecoder queryString = new QueryStringDecoder(req.uri());
     params = new ParameterParser(queryString, conf);
-    DataNodeUGIProvider ugiProvider = new DataNodeUGIProvider(params);
+    DataNodeUGIProvider ugiProvider = new DataNodeUGIProvider(params, conf);
     ugi = ugiProvider.ugi();
     path = params.path();
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/84cbd72a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
index cc4f146..cd88e52 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
@@ -2406,6 +2406,14 @@
 </property>
 
 <property>
+    <name>dfs.webhdfs.ugi.expire.after.access</name>
+    <value>600000</value>
+    <description>How long in milliseconds after the last access
+      the cached UGI will expire. With 0, never expire.
+    </description>
+</property>
+
+<property>
   <name>dfs.namenode.blocks.per.postponedblocks.rescan</name>
   <value>10000</value>
   <description>Number of blocks to rescan for each iteration of

http://git-wip-us.apache.org/repos/asf/hadoop/blob/84cbd72a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/TestDataNodeUGIProvider.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/TestDataNodeUGIProvider.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/TestDataNodeUGIProvider.java
new file mode 100644
index 0000000..b87371e
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/TestDataNodeUGIProvider.java
@@ -0,0 +1,231 @@
+/**
+ * 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.hadoop.hdfs.server.datanode.web.webhdfs;
+
+import static org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod.KERBEROS;
+import static org.mockito.Mockito.mock;
+import io.netty.handler.codec.http.QueryStringDecoder;
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.List;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
+import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenSecretManager;
+import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
+import org.apache.hadoop.hdfs.web.WebHdfsConstants;
+import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
+import org.apache.hadoop.hdfs.web.WebHdfsTestUtil;
+import org.apache.hadoop.hdfs.web.resources.DelegationParam;
+import org.apache.hadoop.hdfs.web.resources.LengthParam;
+import org.apache.hadoop.hdfs.web.resources.NamenodeAddressParam;
+import org.apache.hadoop.hdfs.web.resources.OffsetParam;
+import org.apache.hadoop.hdfs.web.resources.Param;
+import org.apache.hadoop.hdfs.web.resources.UserParam;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.io.WritableComparator;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.security.SecurityUtil;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.token.Token;
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+
+public class TestDataNodeUGIProvider {
+  private final URI uri = URI.create(WebHdfsConstants.WEBHDFS_SCHEME + "://"
+      + "127.0.0.1:0");
+  private final String PATH = "/foo";
+  private final int OFFSET = 42;
+  private final int LENGTH = 512;
+  private final int EXPIRE_AFTER_ACCESS = 5*1000;
+
+  @Test
+  public void testUGICacheSecure() throws Exception {
+
+    final Configuration conf = WebHdfsTestUtil.createConf();
+    conf.setInt(DFSConfigKeys.DFS_WEBHDFS_UGI_EXPIRE_AFTER_ACCESS_KEY,
+        EXPIRE_AFTER_ACCESS);
+
+    // fake turning on security so api thinks it should use tokens
+    SecurityUtil.setAuthenticationMethod(KERBEROS, conf);
+    UserGroupInformation.setConfiguration(conf);
+
+    UserGroupInformation ugi = UserGroupInformation
+        .createRemoteUser("test-user");
+    ugi.setAuthenticationMethod(KERBEROS);
+    ugi = UserGroupInformation.createProxyUser("test-proxy-user", ugi);
+    UserGroupInformation.setLoginUser(ugi);
+
+    List<Token<DelegationTokenIdentifier>> tokens = Lists.newArrayList();
+    getWebHdfsFileSystem(ugi, conf, tokens);
+
+    String uri1 = WebHdfsFileSystem.PATH_PREFIX
+        + PATH
+        + "?op=OPEN"
+        + Param.toSortedString("&", new NamenodeAddressParam("127.0.0.1:1010"),
+            new OffsetParam((long) OFFSET), new LengthParam((long) LENGTH),
+            new DelegationParam(tokens.get(0).encodeToUrlString()));
+
+    String uri2 = WebHdfsFileSystem.PATH_PREFIX
+        + PATH
+        + "?op=OPEN"
+        + Param.toSortedString("&", new NamenodeAddressParam("127.0.0.1:1010"),
+            new OffsetParam((long) OFFSET), new LengthParam((long) LENGTH),
+            new DelegationParam(tokens.get(1).encodeToUrlString()));
+
+    DataNodeUGIProvider ugiProvider1 = new DataNodeUGIProvider(
+        new ParameterParser(new QueryStringDecoder(URI.create(uri1)), conf),
+        conf);
+    UserGroupInformation ugi11 = ugiProvider1.ugi();
+    UserGroupInformation ugi12 = ugiProvider1.ugi();
+
+    Assert.assertEquals(
+        "With UGI cache, two UGIs returned by the same token should be same",
+        ugi11, ugi12);
+
+    DataNodeUGIProvider ugiProvider2 = new DataNodeUGIProvider(
+        new ParameterParser(new QueryStringDecoder(URI.create(uri2)), conf),
+        conf);
+    UserGroupInformation url21 = ugiProvider2.ugi();
+    UserGroupInformation url22 = ugiProvider2.ugi();
+
+    Assert.assertEquals(
+        "With UGI cache, two UGIs returned by the same token should be same",
+        url21, url22);
+
+    Assert.assertNotEquals(
+        "With UGI cache, two UGIs for the different token should not be same",
+        ugi11, url22);
+
+    Thread.sleep(EXPIRE_AFTER_ACCESS);
+    ugi12 = ugiProvider1.ugi();
+    url22 = ugiProvider2.ugi();
+
+    Assert
+        .assertNotEquals(
+            "With cache eviction, two UGIs returned by the same token should not be same",
+            ugi11, ugi12);
+
+    Assert
+        .assertNotEquals(
+            "With cache eviction, two UGIs returned by the same token should not be same",
+            url21, url22);
+
+    Assert.assertNotEquals(
+        "With UGI cache, two UGIs for the different token should not be same",
+        ugi11, url22);
+  }
+
+  @Test
+  public void testUGICacheInSecure() throws Exception {
+
+    final Configuration conf = WebHdfsTestUtil.createConf();
+    conf.setInt(DFSConfigKeys.DFS_WEBHDFS_UGI_EXPIRE_AFTER_ACCESS_KEY,
+        EXPIRE_AFTER_ACCESS);
+
+    String uri1 = WebHdfsFileSystem.PATH_PREFIX
+        + PATH
+        + "?op=OPEN"
+        + Param.toSortedString("&", new OffsetParam((long) OFFSET),
+            new LengthParam((long) LENGTH), new UserParam("root"));
+
+    String uri2 = WebHdfsFileSystem.PATH_PREFIX
+        + PATH
+        + "?op=OPEN"
+        + Param.toSortedString("&", new OffsetParam((long) OFFSET),
+            new LengthParam((long) LENGTH), new UserParam("hdfs"));
+
+    DataNodeUGIProvider ugiProvider1 = new DataNodeUGIProvider(
+        new ParameterParser(new QueryStringDecoder(URI.create(uri1)), conf),
+        conf);
+    UserGroupInformation ugi11 = ugiProvider1.ugi();
+    UserGroupInformation ugi12 = ugiProvider1.ugi();
+
+    Assert.assertEquals(
+        "With UGI cache, two UGIs for the same user should be same", ugi11,
+        ugi12);
+
+    DataNodeUGIProvider ugiProvider2 = new DataNodeUGIProvider(
+        new ParameterParser(new QueryStringDecoder(URI.create(uri2)), conf),
+        conf);
+    UserGroupInformation url21 = ugiProvider2.ugi();
+    UserGroupInformation url22 = ugiProvider2.ugi();
+
+    Assert.assertEquals(
+        "With UGI cache, two UGIs for the same user should be same", url21,
+        url22);
+
+    Assert.assertNotEquals(
+        "With UGI cache, two UGIs for the different user should not be same",
+        ugi11, url22);
+
+    Thread.sleep(EXPIRE_AFTER_ACCESS);
+    ugi12 = ugiProvider1.ugi();
+    url22 = ugiProvider2.ugi();
+
+    Assert
+        .assertNotEquals(
+            "With cache eviction, two UGIs returned by the same user should not be same",
+            ugi11, ugi12);
+
+    Assert
+        .assertNotEquals(
+            "With cache eviction, two UGIs returned by the same user should not be same",
+            url21, url22);
+
+    Assert.assertNotEquals(
+        "With UGI cache, two UGIs for the different user should not be same",
+        ugi11, url22);
+  }
+
+  private WebHdfsFileSystem getWebHdfsFileSystem(UserGroupInformation ugi,
+      Configuration conf, List<Token<DelegationTokenIdentifier>> tokens)
+      throws IOException {
+    if (UserGroupInformation.isSecurityEnabled()) {
+      DelegationTokenIdentifier dtId = new DelegationTokenIdentifier(new Text(
+          ugi.getUserName()), null, null);
+      FSNamesystem namesystem = mock(FSNamesystem.class);
+      DelegationTokenSecretManager dtSecretManager = new DelegationTokenSecretManager(
+          86400000, 86400000, 86400000, 86400000, namesystem);
+      dtSecretManager.startThreads();
+      Token<DelegationTokenIdentifier> token1 = new Token<DelegationTokenIdentifier>(
+          dtId, dtSecretManager);
+      Token<DelegationTokenIdentifier> token2 = new Token<DelegationTokenIdentifier>(
+          dtId, dtSecretManager);
+      SecurityUtil.setTokenService(token1,
+          NetUtils.createSocketAddr(uri.getAuthority()));
+      SecurityUtil.setTokenService(token2,
+          NetUtils.createSocketAddr(uri.getAuthority()));
+      token1.setKind(WebHdfsConstants.WEBHDFS_TOKEN_KIND);
+      token2.setKind(WebHdfsConstants.WEBHDFS_TOKEN_KIND);
+
+      tokens.add(token1);
+      tokens.add(token2);
+
+      ugi.addToken(token1);
+      ugi.addToken(token2);
+    }
+    return (WebHdfsFileSystem) FileSystem.get(uri, conf);
+  }
+}


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