MAPREDUCE-5265. History server admin service to refresh user and superuser group mappings. Contributed by Ashwin Shankar

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504645 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/src/main/conf/log4j.properties

@@ -222,3 +222,13 @@ log4j.appender.RMSUMMARY.MaxFileSize=256MB
 log4j.appender.RMSUMMARY.MaxBackupIndex=20
 log4j.appender.RMSUMMARY.layout=org.apache.log4j.PatternLayout
 log4j.appender.RMSUMMARY.layout.ConversionPattern=%d{ISO8601} %p %c{2}: %m%n
+
+# HS audit log configs
+#mapreduce.hs.audit.logger=INFO,HSAUDIT
+#log4j.logger.org.apache.hadoop.mapreduce.v2.hs.HSAuditLogger=${mapreduce.hs.audit.logger}
+#log4j.additivity.org.apache.hadoop.mapreduce.v2.hs.HSAuditLogger=false
+#log4j.appender.HSAUDIT=org.apache.log4j.DailyRollingFileAppender
+#log4j.appender.HSAUDIT.File=${hadoop.log.dir}/hs-audit.log
+#log4j.appender.HSAUDIT.layout=org.apache.log4j.PatternLayout
+#log4j.appender.HSAUDIT.layout.ConversionPattern=%d{ISO8601} %p %c{2}: %m%n
+#log4j.appender.HSAUDIT.DatePattern=.yyyy-MM-dd

hadoop-mapreduce-project/CHANGES.txt

@@ -143,6 +143,9 @@ Release 2.3.0 - UNRELEASED
 
   NEW FEATURES
 
+    MAPREDUCE-5265. History server admin service to refresh user and superuser
+    group mappings (Ashwin Shankar via jlowe)
+
   IMPROVEMENTS
 
   OPTIMIZATIONS

hadoop-mapreduce-project/bin/mapred

@@ -38,6 +38,7 @@ function print_usage(){
   echo "  historyserver        run job history servers as a standalone daemon"
   echo "  distcp <srcurl> <desturl> copy file or directories recursively"
   echo "  archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive"
+  echo "  hsadmin              job history server admin interface"
   echo ""
   echo "Most commands print help when invoked w/o parameters."
 }
@@ -92,6 +93,9 @@ elif [ "$COMMAND" = "archive" ] ; then
   CLASS=org.apache.hadoop.tools.HadoopArchives
   CLASSPATH=${CLASSPATH}:${TOOL_PATH}
   HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
+elif [ "$COMMAND" = "hsadmin" ] ; then
+  CLASS=org.apache.hadoop.mapreduce.v2.hs.client.HSAdmin
+  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
 else
   echo $COMMAND - invalid command
   print_usage

hadoop-mapreduce-project/dev-support/findbugs-exclude.xml

@@ -457,6 +457,9 @@
    <Match>
     <Package name="org.apache.hadoop.yarn.proto" />
   </Match>
+  <Match>
+    <Package name="org.apache.hadoop.mapreduce.v2.hs.proto" />
+  </Match>
   <Match>
     <Class name="~org\.apache\.hadoop\.mapreduce\.v2\.proto.*" />
   </Match>

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/jobhistory/JHAdminConfig.java

@@ -37,6 +37,17 @@ public class JHAdminConfig {
   public static final String DEFAULT_MR_HISTORY_ADDRESS = "0.0.0.0:" +
       DEFAULT_MR_HISTORY_PORT;
   
+  /** The address of the History server admin interface. */
+  public static final String JHS_ADMIN_ADDRESS = MR_HISTORY_PREFIX
+      + "admin.address";
+  public static final int DEFAULT_JHS_ADMIN_PORT = 10033;
+  public static final String DEFAULT_JHS_ADMIN_ADDRESS = "0.0.0.0:"
+      + DEFAULT_JHS_ADMIN_PORT;
+
+  /** ACL of who can be admin of Job history server. */
+  public static final String JHS_ADMIN_ACL = MR_HISTORY_PREFIX + "admin.acl";
+  public static final String DEFAULT_JHS_ADMIN_ACL = "*";
+  
   /** If history cleaning should be enabled or not.*/
   public static final String MR_HISTORY_CLEANER_ENABLE = 
     MR_HISTORY_PREFIX + "cleaner.enable";

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml

@@ -1138,4 +1138,16 @@
   <description>Whether to use fixed ports with the minicluster</description>
 </property>
 
+<property>
+  <name>mapreduce.jobhistory.admin.address</name>
+  <value>0.0.0.0:10033</value>
+  <description>The address of the History server admin interface.</description>
+</property>
+
+<property>
+  <name>mapreduce.jobhistory.admin.acl</name>
+  <value>*</value>
+  <description>ACL of who can be admin of the History server.</description>
+</property>
+
 </configuration>

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/pom.xml

@@ -67,6 +67,34 @@
           </excludes>
         </configuration>
       </plugin>
+      <plugin>
+		<groupId>org.apache.hadoop</groupId>
+		<artifactId>hadoop-maven-plugins</artifactId>
+		<executions>
+			<execution>
+				<id>compile-protoc</id>
+				<phase>generate-sources</phase>
+				<goals>
+				<goal>protoc</goal>
+				</goals>
+				<configuration>
+				<imports>
+					<param>
+						${basedir}/../../../../hadoop-common-project/hadoop-common/src/main/proto
+					</param>
+					<param>${basedir}/src/main/proto</param>
+				</imports>
+				<source>
+					<directory>${basedir}/src/main/proto</directory>
+					<includes>
+						<include>HSAdminRefreshProtocol.proto</include>
+					</includes>
+				</source>
+				<output>${project.build.directory}/generated-sources/java</output>
+				</configuration>
+			</execution>
+		</executions>
+		</plugin>
     </plugins>
   </build>
 

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/HSAuditLogger.java

@@ -0,0 +1,152 @@
+/**
+ * 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.mapreduce.v2.hs;
+
+import java.net.InetAddress;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.ipc.Server;
+
+@Private
+public class HSAuditLogger {
+  private static final Log LOG = LogFactory.getLog(HSAuditLogger.class);
+
+  static enum Keys {
+    USER, OPERATION, TARGET, RESULT, IP, PERMISSIONS, DESCRIPTION
+  }
+
+  public static class AuditConstants {
+    static final String SUCCESS = "SUCCESS";
+    static final String FAILURE = "FAILURE";
+    static final String KEY_VAL_SEPARATOR = "=";
+    static final char PAIR_SEPARATOR = '\t';
+
+    // Some commonly used descriptions
+    public static final String UNAUTHORIZED_USER = "Unauthorized user";
+  }
+
+  /**
+   * Create a readable and parseable audit log string for a successful event.
+   * 
+   * @param user
+   *          User who made the service request.
+   * @param operation
+   *          Operation requested by the user.
+   * @param target
+   *          The target on which the operation is being performed.
+   * 
+   * <br>
+   * <br>
+   *          Note that the {@link HSAuditLogger} uses tabs ('\t') as a key-val
+   *          delimiter and hence the value fields should not contains tabs
+   *          ('\t').
+   */
+  public static void logSuccess(String user, String operation, String target) {
+    if (LOG.isInfoEnabled()) {
+      LOG.info(createSuccessLog(user, operation, target));
+    }
+  }
+
+  /**
+   * A helper api for creating an audit log for a successful event.
+   */
+  static String createSuccessLog(String user, String operation, String target) {
+    StringBuilder b = new StringBuilder();
+    start(Keys.USER, user, b);
+    addRemoteIP(b);
+    add(Keys.OPERATION, operation, b);
+    add(Keys.TARGET, target, b);
+    add(Keys.RESULT, AuditConstants.SUCCESS, b);
+    return b.toString();
+  }
+
+  /**
+   * A helper api to add remote IP address
+   */
+  static void addRemoteIP(StringBuilder b) {
+    InetAddress ip = Server.getRemoteIp();
+    // ip address can be null for testcases
+    if (ip != null) {
+      add(Keys.IP, ip.getHostAddress(), b);
+    }
+  }
+
+  /**
+   * Appends the key-val pair to the passed builder in the following format
+   * <pair-delim>key=value
+   */
+  static void add(Keys key, String value, StringBuilder b) {
+    b.append(AuditConstants.PAIR_SEPARATOR).append(key.name())
+        .append(AuditConstants.KEY_VAL_SEPARATOR).append(value);
+  }
+
+  /**
+   * Adds the first key-val pair to the passed builder in the following format
+   * key=value
+   */
+  static void start(Keys key, String value, StringBuilder b) {
+    b.append(key.name()).append(AuditConstants.KEY_VAL_SEPARATOR).append(value);
+  }
+
+  /**
+   * Create a readable and parseable audit log string for a failed event.
+   * 
+   * @param user
+   *          User who made the service request.
+   * @param operation
+   *          Operation requested by the user.
+   * @param perm
+   *          Target permissions.
+   * @param target
+   *          The target on which the operation is being performed.
+   * @param description
+   *          Some additional information as to why the operation failed.
+   * 
+   * <br>
+   * <br>
+   *          Note that the {@link HSAuditLogger} uses tabs ('\t') as a key-val
+   *          delimiter and hence the value fields should not contains tabs
+   *          ('\t').
+   */
+  public static void logFailure(String user, String operation, String perm,
+      String target, String description) {
+    if (LOG.isWarnEnabled()) {
+      LOG.warn(createFailureLog(user, operation, perm, target, description));
+    }
+  }
+
+  /**
+   * A helper api for creating an audit log for a failure event.
+   */
+  static String createFailureLog(String user, String operation, String perm,
+      String target, String description) {
+    StringBuilder b = new StringBuilder();
+    start(Keys.USER, user, b);
+    addRemoteIP(b);
+    add(Keys.OPERATION, operation, b);
+    add(Keys.TARGET, target, b);
+    add(Keys.RESULT, AuditConstants.FAILURE, b);
+    add(Keys.DESCRIPTION, description, b);
+    add(Keys.PERMISSIONS, perm, b);
+
+    return b.toString();
+  }
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/HSProxies.java

@@ -0,0 +1,101 @@
+/**
+ * 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.mapreduce.v2.hs;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.ipc.ProtobufRpcEngine;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.mapreduce.v2.hs.protocol.HSAdminRefreshProtocol;
+import org.apache.hadoop.mapreduce.v2.hs.protocolPB.HSAdminRefreshProtocolClientSideTranslatorPB;
+import org.apache.hadoop.mapreduce.v2.hs.protocolPB.HSAdminRefreshProtocolPB;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.security.RefreshUserMappingsProtocol;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.protocolPB.RefreshUserMappingsProtocolClientSideTranslatorPB;
+import org.apache.hadoop.security.protocolPB.RefreshUserMappingsProtocolPB;
+import org.apache.hadoop.tools.GetUserMappingsProtocol;
+import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolClientSideTranslatorPB;
+import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolPB;
+
+@Private
+public class HSProxies {
+
+  private static final Log LOG = LogFactory.getLog(HSProxies.class);
+
+  @SuppressWarnings("unchecked")
+  public static <T> T createProxy(Configuration conf, InetSocketAddress hsaddr,
+      Class<T> xface, UserGroupInformation ugi) throws IOException {
+
+    T proxy;
+    if (xface == RefreshUserMappingsProtocol.class) {
+      proxy = (T) createHSProxyWithRefreshUserMappingsProtocol(hsaddr, conf,
+          ugi);
+    } else if (xface == GetUserMappingsProtocol.class) {
+      proxy = (T) createHSProxyWithGetUserMappingsProtocol(hsaddr, conf, ugi);
+    } else if (xface == HSAdminRefreshProtocol.class) {
+      proxy = (T) createHSProxyWithHSAdminRefreshProtocol(hsaddr, conf, ugi);
+    } else {
+      String message = "Unsupported protocol found when creating the proxy "
+          + "connection to History server: "
+          + ((xface != null) ? xface.getClass().getName() : "null");
+      LOG.error(message);
+      throw new IllegalStateException(message);
+    }
+    return proxy;
+  }
+
+  private static RefreshUserMappingsProtocol createHSProxyWithRefreshUserMappingsProtocol(
+      InetSocketAddress address, Configuration conf, UserGroupInformation ugi)
+      throws IOException {
+    RefreshUserMappingsProtocolPB proxy = (RefreshUserMappingsProtocolPB) createHSProxy(
+        address, conf, ugi, RefreshUserMappingsProtocolPB.class, 0);
+    return new RefreshUserMappingsProtocolClientSideTranslatorPB(proxy);
+  }
+
+  private static GetUserMappingsProtocol createHSProxyWithGetUserMappingsProtocol(
+      InetSocketAddress address, Configuration conf, UserGroupInformation ugi)
+      throws IOException {
+    GetUserMappingsProtocolPB proxy = (GetUserMappingsProtocolPB) createHSProxy(
+        address, conf, ugi, GetUserMappingsProtocolPB.class, 0);
+    return new GetUserMappingsProtocolClientSideTranslatorPB(proxy);
+  }
+
+  private static HSAdminRefreshProtocol createHSProxyWithHSAdminRefreshProtocol(
+      InetSocketAddress hsaddr, Configuration conf, UserGroupInformation ugi)
+      throws IOException {
+    HSAdminRefreshProtocolPB proxy = (HSAdminRefreshProtocolPB) createHSProxy(
+        hsaddr, conf, ugi, HSAdminRefreshProtocolPB.class, 0);
+    return new HSAdminRefreshProtocolClientSideTranslatorPB(proxy);
+  }
+
+  private static Object createHSProxy(InetSocketAddress address,
+      Configuration conf, UserGroupInformation ugi, Class<?> xface,
+      int rpcTimeout) throws IOException {
+    RPC.setProtocolEngine(conf, xface, ProtobufRpcEngine.class);
+    Object proxy = RPC.getProxy(xface, RPC.getProtocolVersion(xface), address,
+        ugi, conf, NetUtils.getDefaultSocketFactory(conf), rpcTimeout);
+    return proxy;
+  }
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistoryServer.java

@@ -26,6 +26,7 @@ import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.mapred.JobConf;
 import org.apache.hadoop.mapreduce.MRConfig;
+import org.apache.hadoop.mapreduce.v2.hs.server.HSAdminServer;
 import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig;
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.metrics2.source.JvmMetrics;
@@ -59,6 +60,7 @@ public class JobHistoryServer extends CompositeService {
   private JobHistory jobHistoryService;
   private JHSDelegationTokenSecretManager jhsDTSecretManager;
   private AggregatedLogDeletionService aggLogDelService;
+  private HSAdminServer hsAdminServer;
 
   public JobHistoryServer() {
     super(JobHistoryServer.class.getName());
@@ -81,9 +83,11 @@ public class JobHistoryServer extends CompositeService {
     clientService = new HistoryClientService(historyContext, 
         this.jhsDTSecretManager);
     aggLogDelService = new AggregatedLogDeletionService();
+    hsAdminServer = new HSAdminServer();
     addService(jobHistoryService);
     addService(clientService);
     addService(aggLogDelService);
+    addService(hsAdminServer);
     super.serviceInit(config);
   }
 

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/client/HSAdmin.java

@@ -0,0 +1,249 @@
+/**
+ * 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.mapreduce.v2.hs.client;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.Arrays;
+
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.mapreduce.v2.hs.HSProxies;
+import org.apache.hadoop.mapreduce.v2.hs.protocol.HSAdminRefreshProtocol;
+import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig;
+import org.apache.hadoop.security.RefreshUserMappingsProtocol;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.tools.GetUserMappingsProtocol;
+import org.apache.hadoop.util.Tool;
+import org.apache.hadoop.util.ToolRunner;
+
+@Private
+public class HSAdmin extends Configured implements Tool {
+
+  public HSAdmin() {
+    super();
+  }
+
+  public HSAdmin(Configuration conf) {
+    super(conf);
+  }
+
+  /**
+   * Displays format of commands.
+   * 
+   * @param cmd
+   *          The command that is being executed.
+   */
+  private static void printUsage(String cmd) {
+    if ("-refreshUserToGroupsMappings".equals(cmd)) {
+      System.err
+          .println("Usage: mapred hsadmin [-refreshUserToGroupsMappings]");
+    } else if ("-refreshSuperUserGroupsConfiguration".equals(cmd)) {
+      System.err
+          .println("Usage: mapred hsadmin [-refreshSuperUserGroupsConfiguration]");
+    } else if ("-refreshAdminAcls".equals(cmd)) {
+      System.err.println("Usage: mapred hsadmin [-refreshAdminAcls]");
+    } else if ("-getGroups".equals(cmd)) {
+      System.err.println("Usage: mapred hsadmin" + " [-getGroups [username]]");
+    } else {
+      System.err.println("Usage: mapred hsadmin");
+      System.err.println("           [-refreshUserToGroupsMappings]");
+      System.err.println("           [-refreshSuperUserGroupsConfiguration]");
+      System.err.println("           [-refreshAdminAcls]");
+      System.err.println("           [-getGroups [username]]");
+      System.err.println("           [-help [cmd]]");
+      System.err.println();
+      ToolRunner.printGenericCommandUsage(System.err);
+    }
+  }
+
+  private static void printHelp(String cmd) {
+    String summary = "hsadmin is the command to execute Job History server administrative commands.\n"
+        + "The full syntax is: \n\n"
+        + "mapred hsadmin"
+        + " [-refreshUserToGroupsMappings]"
+        + " [-refreshSuperUserGroupsConfiguration]"
+        + " [-refreshAdminAcls]"
+        + " [-getGroups [username]]" + " [-help [cmd]]\n";
+
+    String refreshUserToGroupsMappings = "-refreshUserToGroupsMappings: Refresh user-to-groups mappings\n";
+
+    String refreshSuperUserGroupsConfiguration = "-refreshSuperUserGroupsConfiguration: Refresh superuser proxy groups mappings\n";
+
+    String refreshAdminAcls = "-refreshAdminAcls: Refresh acls for administration of Job history server\n";
+
+    String getGroups = "-getGroups [username]: Get the groups which given user belongs to\n";
+
+    String help = "-help [cmd]: \tDisplays help for the given command or all commands if none\n"
+        + "\t\tis specified.\n";
+
+    if ("refreshUserToGroupsMappings".equals(cmd)) {
+      System.out.println(refreshUserToGroupsMappings);
+    } else if ("help".equals(cmd)) {
+      System.out.println(help);
+    } else if ("refreshSuperUserGroupsConfiguration".equals(cmd)) {
+      System.out.println(refreshSuperUserGroupsConfiguration);
+    } else if ("refreshAdminAcls".equals(cmd)) {
+      System.out.println(refreshAdminAcls);
+    } else if ("getGroups".equals(cmd)) {
+      System.out.println(getGroups);
+    } else {
+      System.out.println(summary);
+      System.out.println(refreshUserToGroupsMappings);
+      System.out.println(refreshSuperUserGroupsConfiguration);
+      System.out.println(refreshAdminAcls);
+      System.out.println(getGroups);
+      System.out.println(help);
+      System.out.println();
+      ToolRunner.printGenericCommandUsage(System.out);
+    }
+  }
+
+  private int getGroups(String[] usernames) throws IOException {
+    // Get groups users belongs to
+    if (usernames.length == 0) {
+      usernames = new String[] { UserGroupInformation.getCurrentUser()
+          .getUserName() };
+    }
+
+    // Get the current configuration
+    Configuration conf = getConf();
+
+    InetSocketAddress address = conf.getSocketAddr(
+        JHAdminConfig.JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_PORT);
+
+    GetUserMappingsProtocol getUserMappingProtocol = HSProxies.createProxy(
+        conf, address, GetUserMappingsProtocol.class,
+        UserGroupInformation.getCurrentUser());
+    for (String username : usernames) {
+      StringBuilder sb = new StringBuilder();
+      sb.append(username + " :");
+      for (String group : getUserMappingProtocol.getGroupsForUser(username)) {
+        sb.append(" ");
+        sb.append(group);
+      }
+      System.out.println(sb);
+    }
+
+    return 0;
+  }
+
+  private int refreshUserToGroupsMappings() throws IOException {
+    // Get the current configuration
+    Configuration conf = getConf();
+
+    InetSocketAddress address = conf.getSocketAddr(
+        JHAdminConfig.JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_PORT);
+
+    RefreshUserMappingsProtocol refreshProtocol = HSProxies.createProxy(conf,
+        address, RefreshUserMappingsProtocol.class,
+        UserGroupInformation.getCurrentUser());
+    // Refresh the user-to-groups mappings
+    refreshProtocol.refreshUserToGroupsMappings();
+
+    return 0;
+  }
+
+  private int refreshSuperUserGroupsConfiguration() throws IOException {
+    // Refresh the super-user groups
+    Configuration conf = getConf();
+    InetSocketAddress address = conf.getSocketAddr(
+        JHAdminConfig.JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_PORT);
+
+    RefreshUserMappingsProtocol refreshProtocol = HSProxies.createProxy(conf,
+        address, RefreshUserMappingsProtocol.class,
+        UserGroupInformation.getCurrentUser());
+    // Refresh the super-user group mappings
+    refreshProtocol.refreshSuperUserGroupsConfiguration();
+
+    return 0;
+  }
+
+  private int refreshAdminAcls() throws IOException {
+    // Refresh the admin acls
+    Configuration conf = getConf();
+    InetSocketAddress address = conf.getSocketAddr(
+        JHAdminConfig.JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_PORT);
+
+    HSAdminRefreshProtocol refreshProtocol = HSProxies.createProxy(conf,
+        address, HSAdminRefreshProtocol.class,
+        UserGroupInformation.getCurrentUser());
+    // Refresh the user-to-groups mappings
+    refreshProtocol.refreshAdminAcls();
+    return 0;
+  }
+
+  @Override
+  public int run(String[] args) throws Exception {
+    if (args.length < 1) {
+      printUsage("");
+      return -1;
+    }
+
+    int exitCode = -1;
+    int i = 0;
+    String cmd = args[i++];
+
+    if ("-refreshUserToGroupsMappings".equals(cmd)
+        || "-refreshSuperUserGroupsConfiguration".equals(cmd)
+        || "-refreshAdminAcls".equals(cmd)) {
+      if (args.length != 1) {
+        printUsage(cmd);
+        return exitCode;
+      }
+    }
+
+    exitCode = 0;
+    if ("-refreshUserToGroupsMappings".equals(cmd)) {
+      exitCode = refreshUserToGroupsMappings();
+    } else if ("-refreshSuperUserGroupsConfiguration".equals(cmd)) {
+      exitCode = refreshSuperUserGroupsConfiguration();
+    } else if ("-refreshAdminAcls".equals(cmd)) {
+      exitCode = refreshAdminAcls();
+    } else if ("-getGroups".equals(cmd)) {
+      String[] usernames = Arrays.copyOfRange(args, i, args.length);
+      exitCode = getGroups(usernames);
+    } else if ("-help".equals(cmd)) {
+      if (i < args.length) {
+        printHelp(args[i]);
+      } else {
+        printHelp("");
+      }
+    } else {
+      exitCode = -1;
+      System.err.println(cmd.substring(1) + ": Unknown command");
+      printUsage("");
+    }
+    return exitCode;
+  }
+
+  public static void main(String[] args) throws Exception {
+    int result = ToolRunner.run(new HSAdmin(), args);
+    System.exit(result);
+  }
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/protocol/HSAdminProtocol.java

@@ -0,0 +1,38 @@
+/**
+ * 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.mapreduce.v2.hs.protocol;
+
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.CommonConfigurationKeys;
+import org.apache.hadoop.security.KerberosInfo;
+import org.apache.hadoop.security.RefreshUserMappingsProtocol;
+import org.apache.hadoop.tools.GetUserMappingsProtocol;
+
+/**
+ * Protocol use
+ * 
+ */
+@KerberosInfo(serverPrincipal = CommonConfigurationKeys.HADOOP_SECURITY_SERVICE_USER_NAME_KEY)
+@Private
+@InterfaceStability.Evolving
+public interface HSAdminProtocol extends GetUserMappingsProtocol,
+    RefreshUserMappingsProtocol, HSAdminRefreshProtocol {
+
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/protocol/HSAdminRefreshProtocol.java

@@ -0,0 +1,43 @@
+/**
+ * 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.mapreduce.v2.hs.protocol;
+
+import java.io.IOException;
+
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.CommonConfigurationKeys;
+import org.apache.hadoop.security.KerberosInfo;
+
+/**
+ * Protocol use
+ * 
+ */
+@KerberosInfo(serverPrincipal = CommonConfigurationKeys.HADOOP_SECURITY_SERVICE_USER_NAME_KEY)
+@Private
+@InterfaceStability.Evolving
+public interface HSAdminRefreshProtocol {
+  /**
+   * Refresh admin acls.
+   * 
+   * @throws IOException
+   */
+  public void refreshAdminAcls() throws IOException;
+
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/protocolPB/HSAdminRefreshProtocolClientSideTranslatorPB.java

@@ -0,0 +1,73 @@
+/**
+ * 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.mapreduce.v2.hs.protocolPB;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.ipc.ProtobufHelper;
+import org.apache.hadoop.ipc.ProtocolMetaInterface;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.ipc.RpcClientUtil;
+import org.apache.hadoop.mapreduce.v2.hs.proto.HSAdminRefreshProtocolProtos.RefreshAdminAclsRequestProto;
+import org.apache.hadoop.mapreduce.v2.hs.protocol.HSAdminRefreshProtocol;
+
+import com.google.protobuf.RpcController;
+import com.google.protobuf.ServiceException;
+
+@Private
+public class HSAdminRefreshProtocolClientSideTranslatorPB implements
+    ProtocolMetaInterface, HSAdminRefreshProtocol, Closeable {
+
+  /** RpcController is not used and hence is set to null */
+  private final static RpcController NULL_CONTROLLER = null;
+
+  private final HSAdminRefreshProtocolPB rpcProxy;
+
+  private final static RefreshAdminAclsRequestProto VOID_REFRESH_ADMIN_ACLS_REQUEST = RefreshAdminAclsRequestProto
+      .newBuilder().build();
+
+  public HSAdminRefreshProtocolClientSideTranslatorPB(
+      HSAdminRefreshProtocolPB rpcProxy) {
+    this.rpcProxy = rpcProxy;
+  }
+
+  @Override
+  public void close() throws IOException {
+    RPC.stopProxy(rpcProxy);
+  }
+
+  @Override
+  public void refreshAdminAcls() throws IOException {
+    try {
+      rpcProxy.refreshAdminAcls(NULL_CONTROLLER,
+          VOID_REFRESH_ADMIN_ACLS_REQUEST);
+    } catch (ServiceException se) {
+      throw ProtobufHelper.getRemoteException(se);
+    }
+  }
+
+  @Override
+  public boolean isMethodSupported(String methodName) throws IOException {
+    return RpcClientUtil.isMethodSupported(rpcProxy,
+        HSAdminRefreshProtocolPB.class, RPC.RpcKind.RPC_PROTOCOL_BUFFER,
+        RPC.getProtocolVersion(HSAdminRefreshProtocolPB.class), methodName);
+  }
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/protocolPB/HSAdminRefreshProtocolPB.java

@@ -0,0 +1,33 @@
+/**
+ * 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.mapreduce.v2.hs.protocolPB;
+
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.CommonConfigurationKeys;
+import org.apache.hadoop.ipc.ProtocolInfo;
+import org.apache.hadoop.mapreduce.v2.hs.proto.HSAdminRefreshProtocolProtos.HSAdminRefreshProtocolService;
+import org.apache.hadoop.security.KerberosInfo;
+
+@KerberosInfo(serverPrincipal = CommonConfigurationKeys.HADOOP_SECURITY_SERVICE_USER_NAME_KEY)
+@ProtocolInfo(protocolName = "org.apache.hadoop.mapreduce.v2.hs.protocol.HSAdminRefreshProtocol", protocolVersion = 1)
+@Private
+@InterfaceStability.Evolving
+public interface HSAdminRefreshProtocolPB extends
+    HSAdminRefreshProtocolService.BlockingInterface {
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/protocolPB/HSAdminRefreshProtocolServerSideTranslatorPB.java

@@ -0,0 +1,57 @@
+/**
+ * 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.mapreduce.v2.hs.protocolPB;
+
+import java.io.IOException;
+
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.mapreduce.v2.hs.proto.HSAdminRefreshProtocolProtos.RefreshAdminAclsResponseProto;
+import org.apache.hadoop.mapreduce.v2.hs.proto.HSAdminRefreshProtocolProtos.RefreshAdminAclsRequestProto;
+import org.apache.hadoop.mapreduce.v2.hs.protocol.HSAdminRefreshProtocol;
+
+import com.google.protobuf.RpcController;
+import com.google.protobuf.ServiceException;
+
+@Private
+public class HSAdminRefreshProtocolServerSideTranslatorPB implements
+    HSAdminRefreshProtocolPB {
+
+  private final HSAdminRefreshProtocol impl;
+
+  private final static RefreshAdminAclsResponseProto VOID_REFRESH_ADMIN_ACLS_RESPONSE = RefreshAdminAclsResponseProto
+      .newBuilder().build();
+
+  public HSAdminRefreshProtocolServerSideTranslatorPB(
+      HSAdminRefreshProtocol impl) {
+    this.impl = impl;
+  }
+
+  @Override
+  public RefreshAdminAclsResponseProto refreshAdminAcls(
+      RpcController controller, RefreshAdminAclsRequestProto request)
+      throws ServiceException {
+    try {
+      impl.refreshAdminAcls();
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return VOID_REFRESH_ADMIN_ACLS_RESPONSE;
+  }
+
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/server/HSAdminServer.java

@@ -0,0 +1,196 @@
+/**
+ * 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.mapreduce.v2.hs.server;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.ipc.ProtobufRpcEngine;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.ipc.WritableRpcEngine;
+import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig;
+import org.apache.hadoop.security.AccessControlException;
+import org.apache.hadoop.security.Groups;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authorize.AccessControlList;
+import org.apache.hadoop.security.authorize.ProxyUsers;
+import org.apache.hadoop.security.proto.RefreshUserMappingsProtocolProtos.RefreshUserMappingsProtocolService;
+import org.apache.hadoop.security.protocolPB.RefreshUserMappingsProtocolPB;
+import org.apache.hadoop.security.protocolPB.RefreshUserMappingsProtocolServerSideTranslatorPB;
+import org.apache.hadoop.service.AbstractService;
+import org.apache.hadoop.tools.proto.GetUserMappingsProtocolProtos.GetUserMappingsProtocolService;
+import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolPB;
+import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolServerSideTranslatorPB;
+import org.apache.hadoop.mapreduce.v2.hs.HSAuditLogger;
+import org.apache.hadoop.mapreduce.v2.hs.HSAuditLogger.AuditConstants;
+import org.apache.hadoop.mapreduce.v2.hs.proto.HSAdminRefreshProtocolProtos.HSAdminRefreshProtocolService;
+import org.apache.hadoop.mapreduce.v2.hs.protocol.HSAdminProtocol;
+import org.apache.hadoop.mapreduce.v2.hs.protocolPB.HSAdminRefreshProtocolPB;
+import org.apache.hadoop.mapreduce.v2.hs.protocolPB.HSAdminRefreshProtocolServerSideTranslatorPB;
+
+import com.google.protobuf.BlockingService;
+
+@Private
+public class HSAdminServer extends AbstractService implements HSAdminProtocol {
+
+  private static final Log LOG = LogFactory.getLog(HSAdminServer.class);
+  private AccessControlList adminAcl;
+
+  /** The RPC server that listens to requests from clients */
+  protected RPC.Server clientRpcServer;
+  protected InetSocketAddress clientRpcAddress;
+  private static final String HISTORY_ADMIN_SERVER = "HSAdminServer";
+
+  public HSAdminServer() {
+    super(HSAdminServer.class.getName());
+  }
+
+  @Override
+  public void serviceInit(Configuration conf) throws Exception {
+    RPC.setProtocolEngine(conf, RefreshUserMappingsProtocolPB.class,
+        ProtobufRpcEngine.class);
+
+    RefreshUserMappingsProtocolServerSideTranslatorPB refreshUserMappingXlator = new RefreshUserMappingsProtocolServerSideTranslatorPB(
+        this);
+    BlockingService refreshUserMappingService = RefreshUserMappingsProtocolService
+        .newReflectiveBlockingService(refreshUserMappingXlator);
+
+    GetUserMappingsProtocolServerSideTranslatorPB getUserMappingXlator = new GetUserMappingsProtocolServerSideTranslatorPB(
+        this);
+    BlockingService getUserMappingService = GetUserMappingsProtocolService
+        .newReflectiveBlockingService(getUserMappingXlator);
+
+    HSAdminRefreshProtocolServerSideTranslatorPB refreshHSAdminProtocolXlator = new HSAdminRefreshProtocolServerSideTranslatorPB(
+        this);
+    BlockingService refreshHSAdminProtocolService = HSAdminRefreshProtocolService
+        .newReflectiveBlockingService(refreshHSAdminProtocolXlator);
+
+    WritableRpcEngine.ensureInitialized();
+
+    clientRpcAddress = conf.getSocketAddr(JHAdminConfig.JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_ADDRESS,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_PORT);
+    clientRpcServer = new RPC.Builder(conf)
+        .setProtocol(RefreshUserMappingsProtocolPB.class)
+        .setInstance(refreshUserMappingService)
+        .setBindAddress(clientRpcAddress.getHostName())
+        .setPort(clientRpcAddress.getPort()).setVerbose(false).build();
+
+    addProtocol(conf, GetUserMappingsProtocolPB.class, getUserMappingService);
+    addProtocol(conf, HSAdminRefreshProtocolPB.class, refreshHSAdminProtocolService);
+
+    adminAcl = new AccessControlList(conf.get(JHAdminConfig.JHS_ADMIN_ACL,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_ACL));
+  }
+
+  @Override
+  protected void serviceStart() throws Exception {
+    clientRpcServer.start();
+  }
+
+  @Override
+  protected void serviceStop() throws Exception {
+    if (clientRpcServer != null) {
+      clientRpcServer.stop();
+    }
+  }
+
+  private void addProtocol(Configuration conf, Class<?> protocol,
+      BlockingService blockingService) throws IOException {
+    RPC.setProtocolEngine(conf, protocol, ProtobufRpcEngine.class);
+    clientRpcServer.addProtocol(RPC.RpcKind.RPC_PROTOCOL_BUFFER, protocol,
+        blockingService);
+  }
+
+  private UserGroupInformation checkAcls(String method) throws IOException {
+    UserGroupInformation user;
+    try {
+      user = UserGroupInformation.getCurrentUser();
+    } catch (IOException ioe) {
+      LOG.warn("Couldn't get current user", ioe);
+
+      HSAuditLogger.logFailure("UNKNOWN", method, adminAcl.toString(),
+          HISTORY_ADMIN_SERVER, "Couldn't get current user");
+
+      throw ioe;
+    }
+
+    if (!adminAcl.isUserAllowed(user)) {
+      LOG.warn("User " + user.getShortUserName() + " doesn't have permission"
+          + " to call '" + method + "'");
+
+      HSAuditLogger.logFailure(user.getShortUserName(), method,
+          adminAcl.toString(), HISTORY_ADMIN_SERVER,
+          AuditConstants.UNAUTHORIZED_USER);
+
+      throw new AccessControlException("User " + user.getShortUserName()
+          + " doesn't have permission" + " to call '" + method + "'");
+    }
+    LOG.info("HS Admin: " + method + " invoked by user "
+        + user.getShortUserName());
+
+    return user;
+  }
+
+  @Override
+  public String[] getGroupsForUser(String user) throws IOException {
+    return UserGroupInformation.createRemoteUser(user).getGroupNames();
+  }
+
+  @Override
+  public void refreshUserToGroupsMappings() throws IOException {
+
+    UserGroupInformation user = checkAcls("refreshUserToGroupsMappings");
+
+    Groups.getUserToGroupsMappingService().refresh();
+
+    HSAuditLogger.logSuccess(user.getShortUserName(),
+        "refreshUserToGroupsMappings", HISTORY_ADMIN_SERVER);
+  }
+
+  @Override
+  public void refreshSuperUserGroupsConfiguration() throws IOException {
+    UserGroupInformation user = checkAcls("refreshSuperUserGroupsConfiguration");
+
+    ProxyUsers.refreshSuperUserGroupsConfiguration(createConf());
+
+    HSAuditLogger.logSuccess(user.getShortUserName(),
+        "refreshSuperUserGroupsConfiguration", HISTORY_ADMIN_SERVER);
+  }
+
+  protected Configuration createConf() {
+    return new Configuration();
+  }
+
+  @Override
+  public void refreshAdminAcls() throws IOException {
+    UserGroupInformation user = checkAcls("refreshAdminAcls");
+
+    Configuration conf = createConf();
+    adminAcl = new AccessControlList(conf.get(JHAdminConfig.JHS_ADMIN_ACL,
+        JHAdminConfig.DEFAULT_JHS_ADMIN_ACL));
+    HSAuditLogger.logSuccess(user.getShortUserName(), "refreshAdminAcls",
+        HISTORY_ADMIN_SERVER);
+  }
+
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/proto/HSAdminRefreshProtocol.proto

@@ -0,0 +1,45 @@
+/**
+ * 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.
+ */
+
+option java_package = "org.apache.hadoop.mapreduce.v2.hs.proto";
+option java_outer_classname = "HSAdminRefreshProtocolProtos";
+option java_generic_services = true;
+option java_generate_equals_and_hash = true;
+
+/**
+ *  refresh admin acls request.
+ */
+message RefreshAdminAclsRequestProto {
+}
+
+/**
+ * Response for refresh admin acls.
+ */
+message RefreshAdminAclsResponseProto {
+}
+
+/**
+ * Refresh Protocols implemented by the History server
+ */
+service HSAdminRefreshProtocolService {
+  /**
+   * Refresh admin acls
+   */
+  rpc refreshAdminAcls(RefreshAdminAclsRequestProto)
+      returns(RefreshAdminAclsResponseProto);
+}

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestJobHistoryServer.java

@@ -75,7 +75,7 @@ public class TestJobHistoryServer {
     Configuration config = new Configuration();
     historyServer.init(config);
     assertEquals(STATE.INITED, historyServer.getServiceState());
-    assertEquals(3, historyServer.getServices().size());
+    assertEquals(4, historyServer.getServices().size());
     HistoryClientService historyService = historyServer.getClientService();
     assertNotNull(historyServer.getClientService());
     assertEquals(STATE.INITED, historyService.getServiceState());

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/server/TestHSAdminServer.java

@@ -0,0 +1,241 @@
+/**
+ * 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.mapreduce.v2.hs.server;
+
+import static org.junit.Assert.*;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.hadoop.HadoopIllegalArgumentException;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.ipc.RemoteException;
+import org.apache.hadoop.mapreduce.v2.hs.client.HSAdmin;
+import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig;
+import org.apache.hadoop.security.GroupMappingServiceProvider;
+import org.apache.hadoop.security.Groups;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authorize.ProxyUsers;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import org.apache.hadoop.security.authorize.AuthorizationException;
+
+public class TestHSAdminServer {
+  private HSAdminServer hsAdminServer = null;
+  private HSAdmin hsAdminClient = null;
+  Configuration conf = null;
+  private static long groupRefreshTimeoutSec = 1;
+
+  public static class MockUnixGroupsMapping implements
+      GroupMappingServiceProvider {
+    private int i = 0;
+
+    @Override
+    public List<String> getGroups(String user) throws IOException {
+      System.out.println("Getting groups in MockUnixGroupsMapping");
+      String g1 = user + (10 * i + 1);
+      String g2 = user + (10 * i + 2);
+      List<String> l = new ArrayList<String>(2);
+      l.add(g1);
+      l.add(g2);
+      i++;
+      return l;
+    }
+
+    @Override
+    public void cacheGroupsRefresh() throws IOException {
+      System.out.println("Refreshing groups in MockUnixGroupsMapping");
+    }
+
+    @Override
+    public void cacheGroupsAdd(List<String> groups) throws IOException {
+    }
+  }
+
+  @Before
+  public void init() throws HadoopIllegalArgumentException, IOException {
+    conf = new Configuration();
+    conf.set(JHAdminConfig.JHS_ADMIN_ADDRESS, "0.0.0.0:0");
+    conf.setClass("hadoop.security.group.mapping", MockUnixGroupsMapping.class,
+        GroupMappingServiceProvider.class);
+    conf.setLong("hadoop.security.groups.cache.secs", groupRefreshTimeoutSec);
+    Groups.getUserToGroupsMappingService(conf);
+    hsAdminServer = new HSAdminServer() {
+      @Override
+      protected Configuration createConf() {
+        return conf;
+      }
+    };
+    hsAdminServer.init(conf);
+    hsAdminServer.start();
+    conf.setSocketAddr(JHAdminConfig.JHS_ADMIN_ADDRESS,
+        hsAdminServer.clientRpcServer.getListenerAddress());
+    hsAdminClient = new HSAdmin(conf);
+  }
+
+  @Test
+  public void testGetGroups() throws Exception {
+    // Get the current user
+    String user = UserGroupInformation.getCurrentUser().getUserName();
+    String[] args = new String[2];
+    args[0] = "-getGroups";
+    args[1] = user;
+    // Run the getGroups command
+    int exitCode = hsAdminClient.run(args);
+    assertEquals("Exit code should be 0 but was: " + exitCode, 0, exitCode);
+  }
+
+  @Test
+  public void testRefreshUserToGroupsMappings() throws Exception {
+
+    String[] args = new String[] { "-refreshUserToGroupsMappings" };
+    Groups groups = Groups.getUserToGroupsMappingService(conf);
+    String user = UserGroupInformation.getCurrentUser().getUserName();
+    System.out.println("first attempt:");
+    List<String> g1 = groups.getGroups(user);
+    String[] str_groups = new String[g1.size()];
+    g1.toArray(str_groups);
+    System.out.println(Arrays.toString(str_groups));
+
+    // Now groups of this user has changed but getGroups returns from the
+    // cache,so we would see same groups as before
+    System.out.println("second attempt, should be same:");
+    List<String> g2 = groups.getGroups(user);
+    g2.toArray(str_groups);
+    System.out.println(Arrays.toString(str_groups));
+    for (int i = 0; i < g2.size(); i++) {
+      assertEquals("Should be same group ", g1.get(i), g2.get(i));
+    }
+    // run the command,which clears the cache
+    hsAdminClient.run(args);
+    System.out
+        .println("third attempt(after refresh command), should be different:");
+    // Now get groups should return new groups
+    List<String> g3 = groups.getGroups(user);
+    g3.toArray(str_groups);
+    System.out.println(Arrays.toString(str_groups));
+    for (int i = 0; i < g3.size(); i++) {
+      assertFalse(
+          "Should be different group: " + g1.get(i) + " and " + g3.get(i), g1
+              .get(i).equals(g3.get(i)));
+    }
+  }
+
+  @Test
+  public void testRefreshSuperUserGroups() throws Exception {
+
+    UserGroupInformation ugi = mock(UserGroupInformation.class);
+    UserGroupInformation superUser = mock(UserGroupInformation.class);
+
+    when(ugi.getRealUser()).thenReturn(superUser);
+    when(superUser.getShortUserName()).thenReturn("superuser");
+    when(superUser.getUserName()).thenReturn("superuser");
+    when(ugi.getGroupNames()).thenReturn(new String[] { "group3" });
+    when(ugi.getUserName()).thenReturn("regularUser");
+
+    // Set super user groups not to include groups of regularUser
+    conf.set("hadoop.proxyuser.superuser.groups", "group1,group2");
+    conf.set("hadoop.proxyuser.superuser.hosts", "127.0.0.1");
+    String[] args = new String[1];
+    args[0] = "-refreshSuperUserGroupsConfiguration";
+    hsAdminClient.run(args);
+
+    Throwable th = null;
+    try {
+      ProxyUsers.authorize(ugi, "127.0.0.1", conf);
+    } catch (Exception e) {
+      th = e;
+    }
+    // Exception should be thrown
+    assertTrue(th instanceof AuthorizationException);
+
+    // Now add regularUser group to superuser group but not execute
+    // refreshSuperUserGroupMapping
+    conf.set("hadoop.proxyuser.superuser.groups", "group1,group2,group3");
+
+    // Again,lets run ProxyUsers.authorize and see if regularUser can be
+    // impersonated
+    // resetting th
+    th = null;
+    try {
+      ProxyUsers.authorize(ugi, "127.0.0.1", conf);
+    } catch (Exception e) {
+      th = e;
+    }
+    // Exception should be thrown again since we didn't refresh the configs
+    assertTrue(th instanceof AuthorizationException);
+
+    // Lets refresh the config by running refreshSuperUserGroupsConfiguration
+    hsAdminClient.run(args);
+
+    th = null;
+
+    try {
+      ProxyUsers.authorize(ugi, "127.0.0.1", conf);
+    } catch (Exception e) {
+      th = e;
+    }
+    // No exception thrown since regularUser can be impersonated.
+    assertNull("Unexpected exception thrown: " + th, th);
+
+  }
+
+  @Test
+  public void testRefreshAdminAcls() throws Exception {
+    // Setting current user to admin acl
+    conf.set(JHAdminConfig.JHS_ADMIN_ACL, UserGroupInformation.getCurrentUser()
+        .getUserName());
+    String[] args = new String[1];
+    args[0] = "-refreshAdminAcls";
+    hsAdminClient.run(args);
+
+    // Now I should be able to run any hsadmin command without any exception
+    // being thrown
+    args[0] = "-refreshSuperUserGroupsConfiguration";
+    hsAdminClient.run(args);
+
+    // Lets remove current user from admin acl
+    conf.set(JHAdminConfig.JHS_ADMIN_ACL, "notCurrentUser");
+    args[0] = "-refreshAdminAcls";
+    hsAdminClient.run(args);
+
+    // Now I should get an exception if i run any hsadmin command
+    Throwable th = null;
+    args[0] = "-refreshSuperUserGroupsConfiguration";
+    try {
+      hsAdminClient.run(args);
+    } catch (Exception e) {
+      th = e;
+    }
+    assertTrue(th instanceof RemoteException);
+  }
+
+  @After
+  public void cleanUp() {
+    if (hsAdminServer != null)
+      hsAdminServer.stop();
+  }
+
+}