YARN-5709. Cleanup leader election configs and pluggability. Contribtued by Karthik Kambatla

(cherry picked from commit b817c565c8be1d4a682d119bfac6f43ee09e87f0)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java

@@ -29,6 +29,7 @@
 import org.apache.hadoop.classification.InterfaceStability.Evolving;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.ha.ActiveStandbyElector;
 import org.apache.hadoop.http.HttpConfig;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.util.StringUtils;
@@ -655,9 +656,20 @@ public static boolean isAclEnabled(Configuration conf) {
   public static final String RM_HA_FC_ELECTOR_ZK_RETRIES_KEY = RM_HA_PREFIX
       + "failover-controller.active-standby-elector.zk.retries";
 
-  @Private
+
+  /**
+   * Whether to use curator-based elector for leader election.
+   *
+   * @deprecated Eventually, we want to default to the curator-based
+   * implementation and remove the {@link ActiveStandbyElector} based
+   * implementation. We should remove this config then.
+   */
+  @Unstable
+  @Deprecated
   public static final String CURATOR_LEADER_ELECTOR =
       RM_HA_PREFIX + "curator-leader-elector.enabled";
+  @Private
+  @Unstable
   public static final boolean DEFAULT_CURATOR_LEADER_ELECTOR_ENABLED = false;
 
   ////////////////////////////////

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.java

@@ -43,12 +43,16 @@
 import java.util.Timer;
 import java.util.TimerTask;
 
+/**
+ * Leader election implementation that uses {@link ActiveStandbyElector}.
+ */
 @InterfaceAudience.Private
 @InterfaceStability.Unstable
-public class EmbeddedElectorService extends AbstractService
+public class ActiveStandbyElectorBasedElectorService extends AbstractService
-    implements ActiveStandbyElector.ActiveStandbyElectorCallback {
+    implements EmbeddedElector,
-  private static final Log LOG =
+    ActiveStandbyElector.ActiveStandbyElectorCallback {
-      LogFactory.getLog(EmbeddedElectorService.class.getName());
+  private static final Log LOG = LogFactory.getLog(
+      ActiveStandbyElectorBasedElectorService.class.getName());
   private static final HAServiceProtocol.StateChangeRequestInfo req =
       new HAServiceProtocol.StateChangeRequestInfo(
           HAServiceProtocol.RequestSource.REQUEST_BY_ZKFC);
@@ -62,15 +66,17 @@ public class EmbeddedElectorService extends AbstractService
   @VisibleForTesting
   final Object zkDisconnectLock = new Object();
 
-  EmbeddedElectorService(RMContext rmContext) {
+  ActiveStandbyElectorBasedElectorService(RMContext rmContext) {
-    super(EmbeddedElectorService.class.getName());
+    super(ActiveStandbyElectorBasedElectorService.class.getName());
     this.rmContext = rmContext;
   }
 
   @Override
   protected void serviceInit(Configuration conf)
       throws Exception {
-    conf = conf instanceof YarnConfiguration ? conf : new YarnConfiguration(conf);
+    conf = conf instanceof YarnConfiguration
+        ? conf
+        : new YarnConfiguration(conf);
 
     String zkQuorum = conf.get(YarnConfiguration.RM_ZK_ADDRESS);
     if (zkQuorum == null) {
@@ -199,7 +205,8 @@ public void run() {
   @Override
   public void notifyFatalError(String errorMessage) {
     rmContext.getDispatcher().getEventHandler().handle(
-        new RMFatalEvent(RMFatalEventType.EMBEDDED_ELECTOR_FAILED, errorMessage));
+        new RMFatalEvent(RMFatalEventType.EMBEDDED_ELECTOR_FAILED,
+            errorMessage));
   }
 
   @Override
@@ -249,12 +256,16 @@ private boolean isParentZnodeSafe(String clusterId)
     return true;
   }
 
-  public void resetLeaderElection() {
+  // EmbeddedElector methods
+
+  @Override
+  public void rejoinElection() {
     elector.quitElection(false);
     elector.joinElection(localActiveNodeInfo);
   }
 
-  public String getHAZookeeperConnectionState() {
+  @Override
+  public String getZookeeperConnectionState() {
     return elector.getHAZookeeperConnectionState();
   }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/AdminService.java

@@ -29,7 +29,6 @@
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.ha.HAServiceProtocol;
@@ -108,8 +107,6 @@ public class AdminService extends CompositeService implements
   private String rmId;
 
   private boolean autoFailoverEnabled;
-  private boolean curatorEnabled;
-  private EmbeddedElectorService embeddedElector;
 
   private Server server;
 
@@ -134,18 +131,8 @@ public AdminService(ResourceManager rm, RMContext rmContext) {
 
   @Override
   public void serviceInit(Configuration conf) throws Exception {
-    if (rmContext.isHAEnabled()) {
+    autoFailoverEnabled =
-      curatorEnabled = conf.getBoolean(YarnConfiguration.CURATOR_LEADER_ELECTOR,
+        rmContext.isHAEnabled() && HAUtil.isAutomaticFailoverEnabled(conf);
-          YarnConfiguration.DEFAULT_CURATOR_LEADER_ELECTOR_ENABLED);
-      autoFailoverEnabled = HAUtil.isAutomaticFailoverEnabled(conf);
-      if (autoFailoverEnabled && !curatorEnabled) {
-        if (HAUtil.isAutomaticFailoverEmbedded(conf)) {
-          embeddedElector = createEmbeddedElectorService();
-          addIfService(embeddedElector);
-        }
-      }
-
-    }
 
     masterServiceBindAddress = conf.getSocketAddr(
         YarnConfiguration.RM_BIND_HOST,
@@ -228,17 +215,6 @@ protected void stopServer() throws Exception {
     }
   }
 
-  protected EmbeddedElectorService createEmbeddedElectorService() {
-    return new EmbeddedElectorService(rmContext);
-  }
-
-  @InterfaceAudience.Private
-  void resetLeaderElection() {
-    if (embeddedElector != null) {
-      embeddedElector.resetLeaderElection();
-    }
-  }
-
   private UserGroupInformation checkAccess(String method) throws IOException {
     return RMServerUtils.verifyAdminAccess(authorizer, method, LOG);
   }
@@ -375,21 +351,16 @@ public synchronized void transitionToStandby(
     }
   }
 
+  /**
+   * Return the HA status of this RM. This includes the current state and
+   * whether the RM is ready to become active.
+   *
+   * @return {@link HAServiceStatus} of the current RM
+   * @throws IOException if the caller does not have permissions
+   */
   @Override
   public synchronized HAServiceStatus getServiceStatus() throws IOException {
     checkAccess("getServiceState");
-    if (curatorEnabled) {
-      HAServiceStatus state;
-      if (rmContext.getLeaderElectorService().hasLeaderShip()) {
-        state = new HAServiceStatus(HAServiceState.ACTIVE);
-      } else {
-        state = new HAServiceStatus(HAServiceState.STANDBY);
-      }
-      // set empty string to avoid NPE at
-      // HAServiceProtocolServerSideTranslatorPB#getServiceStatus
-      state.setNotReadyToBecomeActive("");
-      return state;
-    } else {
     HAServiceState haState = rmContext.getHAServiceState();
     HAServiceStatus ret = new HAServiceStatus(haState);
     if (isRMActive() || haState == HAServiceProtocol.HAServiceState.STANDBY) {
@@ -399,7 +370,6 @@ public synchronized HAServiceStatus getServiceStatus() throws IOException {
     }
     return ret;
   }
-  }
 
   @Override
   public RefreshQueuesResponse refreshQueues(RefreshQueuesRequest request)
@@ -926,19 +896,4 @@ private void refreshClusterMaxPriority() throws IOException, YarnException {
 
     rmContext.getScheduler().setClusterMaxPriority(conf);
   }
-
-  public String getHAZookeeperConnectionState() {
-    if (!rmContext.isHAEnabled()) {
-      return "ResourceManager HA is not enabled.";
-    } else if (!autoFailoverEnabled) {
-      return "Auto Failover is not enabled.";
-    }
-    if (curatorEnabled) {
-      return "Connected to zookeeper : " + rmContext
-          .getLeaderElectorService().getCuratorClient().getZookeeperClient()
-          .isConnected();
-    } else {
-      return this.embeddedElector.getHAZookeeperConnectionState();
-    }
-  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/CuratorBasedElectorService.java

@@ -24,6 +24,8 @@
 import org.apache.curator.framework.CuratorFramework;
 import org.apache.curator.framework.recipes.leader.LeaderLatch;
 import org.apache.curator.framework.recipes.leader.LeaderLatchListener;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ha.HAServiceProtocol;
 import org.apache.hadoop.service.AbstractService;
@@ -32,10 +34,15 @@
 
 import java.io.IOException;
 
-
+/**
-public class LeaderElectorService extends AbstractService implements
+ * Leader election implementation that uses Curator.
-    LeaderLatchListener {
+ */
-  public static final Log LOG = LogFactory.getLog(LeaderElectorService.class);
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+public class CuratorBasedElectorService extends AbstractService
+    implements EmbeddedElector, LeaderLatchListener {
+  public static final Log LOG =
+      LogFactory.getLog(CuratorBasedElectorService.class);
   private LeaderLatch leaderLatch;
   private CuratorFramework curator;
   private RMContext rmContext;
@@ -43,8 +50,8 @@ public class LeaderElectorService extends AbstractService implements
   private String rmId;
   private ResourceManager rm;
 
-  public LeaderElectorService(RMContext rmContext, ResourceManager rm) {
+  public CuratorBasedElectorService(RMContext rmContext, ResourceManager rm) {
-    super(LeaderElectorService.class.getName());
+    super(CuratorBasedElectorService.class.getName());
     this.rmContext = rmContext;
     this.rm = rm;
   }
@@ -74,10 +81,22 @@ protected void serviceStop() throws Exception {
     super.serviceStop();
   }
 
-  public boolean hasLeaderShip() {
+  @Override
-    return leaderLatch.hasLeadership();
+  public void rejoinElection() {
+    try {
+      closeLeaderLatch();
+      Thread.sleep(1000);
+      initAndStartLeaderLatch();
+    } catch (Exception e) {
+      LOG.info("Fail to re-join election.", e);
+    }
   }
 
+  @Override
+  public String getZookeeperConnectionState() {
+    return "Connected to zookeeper : " +
+        curator.getZookeeperClient().isConnected();
+  }
 
   @Override
   public void isLeader() {
@@ -90,17 +109,7 @@ public void isLeader() {
       LOG.info(rmId + " failed to transition to active, giving up leadership",
           e);
       notLeader();
-      reJoinElection();
+      rejoinElection();
-    }
-  }
-
-  public void reJoinElection() {
-    try {
-      closeLeaderLatch();
-      Thread.sleep(1000);
-      initAndStartLeaderLatch();
-    } catch (Exception e) {
-      LOG.info("Fail to re-join election.", e);
     }
   }
 
@@ -109,6 +118,7 @@ private void closeLeaderLatch() throws IOException {
       leaderLatch.close();
     }
   }
+
   @Override
   public void notLeader() {
     LOG.info(rmId + " relinquish leadership");

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.java

@@ -0,0 +1,41 @@
+/**
+ * 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.yarn.server.resourcemanager;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.service.Service;
+
+/**
+ * Interface that all embedded leader electors must implement.
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+public interface EmbeddedElector extends Service{
+  /**
+   * Leave and rejoin leader election.
+   */
+  void rejoinElection();
+
+  /**
+   * Get information about the elector's connection to Zookeeper.
+   *
+   * @return zookeeper connection state
+   */
+  String getZookeeperConnectionState();
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/RMContext.java

@@ -139,13 +139,15 @@ void setRMDelegatedNodeLabelsUpdater(
   
   void setQueuePlacementManager(PlacementManager placementMgr);
 
-  void setLeaderElectorService(LeaderElectorService elector);
+  void setLeaderElectorService(EmbeddedElector elector);
 
-  LeaderElectorService getLeaderElectorService();
+  EmbeddedElector getLeaderElectorService();
 
   QueueLimitCalculator getNodeManagerQueueLimitCalculator();
 
   void setRMAppLifetimeMonitor(RMAppLifetimeMonitor rmAppLifetimeMonitor);
 
   RMAppLifetimeMonitor getRMAppLifetimeMonitor();
+
+  String getHAZookeeperConnectionState();
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/RMContextImpl.java

@@ -75,7 +75,7 @@ public class RMContextImpl implements RMContext {
 
   private RMApplicationHistoryWriter rmApplicationHistoryWriter;
   private SystemMetricsPublisher systemMetricsPublisher;
-  private LeaderElectorService elector;
+  private EmbeddedElector elector;
 
   private QueueLimitCalculator queueLimitCalculator;
 
@@ -142,12 +142,12 @@ public Dispatcher getDispatcher() {
   }
 
   @Override
-  public void setLeaderElectorService(LeaderElectorService elector) {
+  public void setLeaderElectorService(EmbeddedElector elector) {
     this.elector = elector;
   }
 
   @Override
-  public LeaderElectorService getLeaderElectorService() {
+  public EmbeddedElector getLeaderElectorService() {
     return this.elector;
   }
 
@@ -500,4 +500,13 @@ public void setRMAppLifetimeMonitor(
   public RMAppLifetimeMonitor getRMAppLifetimeMonitor() {
     return this.activeServiceContext.getRMAppLifetimeMonitor();
   }
+
+  public String getHAZookeeperConnectionState() {
+    if (elector == null) {
+      return "Could not find leader elector. Verify both HA and automatic " +
+          "failover are enabled.";
+    } else {
+      return elector.getZookeeperConnectionState();
+    }
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ResourceManager.java

@@ -256,12 +256,13 @@ protected void serviceInit(Configuration conf) throws Exception {
     this.rmContext.setHAEnabled(HAUtil.isHAEnabled(this.conf));
     if (this.rmContext.isHAEnabled()) {
       HAUtil.verifyAndSetConfiguration(this.conf);
-      curatorEnabled = conf.getBoolean(YarnConfiguration.CURATOR_LEADER_ELECTOR,
+
-          YarnConfiguration.DEFAULT_CURATOR_LEADER_ELECTOR_ENABLED);
+      // If the RM is configured to use an embedded leader elector,
-      if (curatorEnabled) {
+      // initialize the leader elector.
-        this.curator = createAndStartCurator(conf);
+      if (HAUtil.isAutomaticFailoverEnabled(conf) &&
-        LeaderElectorService elector = new LeaderElectorService(rmContext, this);
+          HAUtil.isAutomaticFailoverEmbedded(conf)) {
-        addService(elector);
+        EmbeddedElector elector = createEmbeddedElector();
+        addIfService(elector);
         rmContext.setLeaderElectorService(elector);
       }
     }
@@ -305,6 +306,20 @@ protected void serviceInit(Configuration conf) throws Exception {
     super.serviceInit(this.conf);
   }
 
+  protected EmbeddedElector createEmbeddedElector() throws IOException {
+    EmbeddedElector elector;
+    curatorEnabled =
+        conf.getBoolean(YarnConfiguration.CURATOR_LEADER_ELECTOR,
+            YarnConfiguration.DEFAULT_CURATOR_LEADER_ELECTOR_ENABLED);
+    if (curatorEnabled) {
+      this.curator = createAndStartCurator(conf);
+      elector = new CuratorBasedElectorService(rmContext, this);
+    } else {
+      elector = new ActiveStandbyElectorBasedElectorService(rmContext);
+    }
+    return elector;
+  }
+
   public CuratorFramework createAndStartCurator(Configuration conf)
       throws IOException {
     String zkHostPort = conf.get(YarnConfiguration.RM_ZK_ADDRESS);
@@ -754,14 +769,12 @@ public void handleTransitionToStandBy() {
         // Transition to standby and reinit active services
         LOG.info("Transitioning RM to Standby mode");
         transitionToStandby(true);
-        if (curatorEnabled) {
+        EmbeddedElector elector = rmContext.getLeaderElectorService();
-          rmContext.getLeaderElectorService().reJoinElection();
+        if (elector != null) {
-        } else {
+          elector.rejoinElection();
-          adminService.resetLeaderElection();
         }
-        return;
       } catch (Exception e) {
-        LOG.fatal("Failed to transition RM to Standby mode.");
+        LOG.fatal("Failed to transition RM to Standby mode.", e);
         ExitUtil.terminate(1, e);
       }
     }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebApp.java

@@ -121,8 +121,7 @@ private String buildRedirectPath() {
   }
 
   public String getHAZookeeperConnectionState() {
-    return rm.getRMContext().getRMAdminService()
+    return getRMContext().getHAZookeeperConnectionState();
-      .getHAZookeeperConnectionState();
   }
 
   public RMContext getRMContext() {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/ClusterInfo.java

@@ -64,7 +64,7 @@ public ClusterInfo(ResourceManager rm) {
     this.hadoopBuildVersion = VersionInfo.getBuildVersion();
     this.hadoopVersionBuiltOn = VersionInfo.getDate();
     this.haZooKeeperConnectionState =
-        rm.getRMContext().getRMAdminService().getHAZookeeperConnectionState();
+        rm.getRMContext().getHAZookeeperConnectionState();
   }
 
   public String getState() {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/MockRM.java

@@ -109,6 +109,7 @@
 import org.apache.log4j.Logger;
 import org.junit.Assert;
 
+
 @SuppressWarnings("unchecked")
 public class MockRM extends ResourceManager {
 
@@ -123,6 +124,8 @@ public class MockRM extends ResourceManager {
   private final boolean useNullRMNodeLabelsManager;
   private boolean disableDrainEventsImplicitly;
 
+  private boolean useRealElector = false;
+
   public MockRM() {
     this(new YarnConfiguration());
   }
@@ -132,13 +135,23 @@ public MockRM(Configuration conf) {
   }
   
   public MockRM(Configuration conf, RMStateStore store) {
-    this(conf, store, true);
+    this(conf, store, true, false);
+  }
+
+  public MockRM(Configuration conf, boolean useRealElector) {
+    this(conf, null, true, useRealElector);
   }
 
   public MockRM(Configuration conf, RMStateStore store,
-      boolean useNullRMNodeLabelsManager) {
+      boolean useRealElector) {
+    this(conf, store, true, useRealElector);
+  }
+
+  public MockRM(Configuration conf, RMStateStore store,
+      boolean useNullRMNodeLabelsManager, boolean useRealElector) {
     super();
     this.useNullRMNodeLabelsManager = useNullRMNodeLabelsManager;
+    this.useRealElector = useRealElector;
     init(conf instanceof YarnConfiguration ? conf : new YarnConfiguration(conf));
     if (store != null) {
       setRMStateStore(store);
@@ -192,6 +205,15 @@ protected Dispatcher createDispatcher() {
     return new DrainDispatcher();
   }
 
+  @Override
+  protected EmbeddedElector createEmbeddedElector() throws IOException {
+    if (useRealElector) {
+      return super.createEmbeddedElector();
+    } else {
+      return null;
+    }
+  }
+
   @Override
   protected EventHandler<SchedulerEvent> createSchedulerEventDispatcher() {
     return new EventHandler<SchedulerEvent>() {
@@ -984,11 +1006,6 @@ protected void startServer() {
       protected void stopServer() {
         // don't do anything
       }
-
-      @Override
-      protected EmbeddedElectorService createEmbeddedElectorService() {
-        return null;
-      }
     };
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/RMHATestBase.java

@@ -108,13 +108,13 @@ protected MockAM launchAM(RMApp app, MockRM rm, MockNM nm)
   }
 
   protected void startRMs() throws IOException {
-    rm1 = new MockRM(confForRM1, null, false){
+    rm1 = new MockRM(confForRM1, null, false, false){
       @Override
       protected Dispatcher createDispatcher() {
         return new DrainDispatcher();
       }
     };
-    rm2 = new MockRM(confForRM2, null, false){
+    rm2 = new MockRM(confForRM2, null, false, false){
       @Override
       protected Dispatcher createDispatcher() {
         return new DrainDispatcher();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestLeaderElectorService.java

@@ -63,7 +63,6 @@ public void setUp() throws Exception {
     conf = new Configuration();
     conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
     conf.setBoolean(YarnConfiguration.CURATOR_LEADER_ELECTOR, true);
-    conf.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, true);
 
     conf.set(YarnConfiguration.RM_CLUSTER_ID, "cluster1");
     conf.set(YarnConfiguration.RM_HA_IDS, RM1_NODE_ID + "," + RM2_NODE_ID);
@@ -121,7 +120,7 @@ public synchronized void storeApplicationStateInternal(ApplicationId
       }
     };
     memStore.init(conf);
-    rm1 = new MockRM(conf, memStore);
+    rm1 = new MockRM(conf, memStore, true);
     rm1.init(conf);
     rm1.start();
 
@@ -167,7 +166,8 @@ public void testExpireCurrentZKSession() throws Exception{
 
     rm1 = startRM("rm1", HAServiceState.ACTIVE);
 
-    LeaderElectorService service = rm1.getRMContext().getLeaderElectorService();
+    CuratorBasedElectorService service = (CuratorBasedElectorService)
+        rm1.getRMContext().getLeaderElectorService();
     CuratorZookeeperClient client =
         service.getCuratorClient().getZookeeperClient();
     // this will expire current curator client session. curator will re-establish
@@ -187,7 +187,7 @@ public void testRMFailToTransitionToActive() throws Exception{
     Thread launchRM = new Thread() {
       @Override
       public void run() {
-        rm1 = new MockRM(conf) {
+        rm1 = new MockRM(conf, true) {
           @Override
           synchronized void transitionToActive() throws Exception {
             if (throwException.get()) {
@@ -217,9 +217,12 @@ public void testKillZKInstance() throws Exception {
     rm1 = startRM("rm1", HAServiceState.ACTIVE);
     rm2 = startRM("rm2", HAServiceState.STANDBY);
 
+    CuratorBasedElectorService service = (CuratorBasedElectorService)
+        rm1.getRMContext().getLeaderElectorService();
+
     ZooKeeper zkClient =
-        rm1.getRMContext().getLeaderElectorService().getCuratorClient()
+        service.getCuratorClient().getZookeeperClient().getZooKeeper();
-            .getZookeeperClient().getZooKeeper();
+
     InstanceSpec connectionInstance = zkCluster.findConnectionInstance(zkClient);
     zkCluster.killServer(connectionInstance);
 
@@ -245,7 +248,7 @@ public void testKillZKInstance() throws Exception {
   private MockRM startRM(String rmId, HAServiceState state) throws Exception{
     YarnConfiguration yarnConf = new YarnConfiguration(conf);
     yarnConf.set(YarnConfiguration.RM_HA_ID, rmId);
-    MockRM rm = new MockRM(yarnConf);
+    MockRM rm = new MockRM(yarnConf, true);
     rm.init(yarnConf);
     rm.start();
     waitFor(rm, state);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMEmbeddedElector.java

@@ -128,7 +128,8 @@ private void testCallbackSynchronization(SyncTestType type)
     myConf.setInt(YarnConfiguration.RM_ZK_TIMEOUT_MS, 50);
     when(rc.getRMAdminService()).thenReturn(as);
 
-    EmbeddedElectorService ees = new EmbeddedElectorService(rc);
+    ActiveStandbyElectorBasedElectorService
+        ees = new ActiveStandbyElectorBasedElectorService(rc);
     ees.init(myConf);
 
     ees.enterNeutralMode();
@@ -165,7 +166,8 @@ private void testCallbackSynchronization(SyncTestType type)
    * @throws InterruptedException if interrupted
    */
   private void testCallbackSynchronizationActive(AdminService as,
-      EmbeddedElectorService ees) throws IOException, InterruptedException {
+      ActiveStandbyElectorBasedElectorService ees)
+      throws IOException, InterruptedException {
     ees.becomeActive();
 
     Thread.sleep(100);
@@ -184,7 +186,8 @@ private void testCallbackSynchronizationActive(AdminService as,
    * @throws InterruptedException if interrupted
    */
   private void testCallbackSynchronizationStandby(AdminService as,
-      EmbeddedElectorService ees) throws IOException, InterruptedException {
+      ActiveStandbyElectorBasedElectorService ees)
+      throws IOException, InterruptedException {
     ees.becomeStandby();
 
     Thread.sleep(100);
@@ -202,7 +205,8 @@ private void testCallbackSynchronizationStandby(AdminService as,
    * @throws InterruptedException if interrupted
    */
   private void testCallbackSynchronizationNeutral(AdminService as,
-      EmbeddedElectorService ees) throws IOException, InterruptedException {
+      ActiveStandbyElectorBasedElectorService ees)
+      throws IOException, InterruptedException {
     ees.enterNeutralMode();
 
     Thread.sleep(100);
@@ -221,7 +225,8 @@ private void testCallbackSynchronizationNeutral(AdminService as,
    * @throws InterruptedException if interrupted
    */
   private void testCallbackSynchronizationTimingActive(AdminService as,
-      EmbeddedElectorService ees) throws IOException, InterruptedException {
+      ActiveStandbyElectorBasedElectorService ees)
+      throws IOException, InterruptedException {
     synchronized (ees.zkDisconnectLock) {
       // Sleep while holding the lock so that the timer thread can't do
       // anything when it runs.  Sleep until we're pretty sure the timer thread
@@ -251,7 +256,8 @@ private void testCallbackSynchronizationTimingActive(AdminService as,
    * @throws InterruptedException if interrupted
    */
   private void testCallbackSynchronizationTimingStandby(AdminService as,
-      EmbeddedElectorService ees) throws IOException, InterruptedException {
+      ActiveStandbyElectorBasedElectorService ees)
+      throws IOException, InterruptedException {
     synchronized (ees.zkDisconnectLock) {
       // Sleep while holding the lock so that the timer thread can't do
       // anything when it runs.  Sleep until we're pretty sure the timer thread
@@ -284,11 +290,8 @@ private class MockRMWithElector extends MockRM {
     }
 
     @Override
-    protected AdminService createAdminService() {
+    protected EmbeddedElector createEmbeddedElector() {
-      return new AdminService(MockRMWithElector.this, getRMContext()) {
+      return new ActiveStandbyElectorBasedElectorService(getRMContext()) {
-        @Override
-        protected EmbeddedElectorService createEmbeddedElectorService() {
-          return new EmbeddedElectorService(getRMContext()) {
         @Override
         public void becomeActive() throws
             ServiceFailedException {
@@ -304,7 +307,5 @@ public void becomeActive() throws
         }
       };
     }
-      };
-    }
   }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMHA.java

@@ -182,7 +182,7 @@ private void checkActiveRMWebServices() throws JSONException {
    * 6. Stop the RM: All services should stop and RM should not be ready to
    * become Active
    */
-  @Test (timeout = 30000)
+  @Test(timeout = 30000)
   public void testFailoverAndTransitions() throws Exception {
     configuration.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
     Configuration conf = new YarnConfiguration(configuration);
@@ -384,7 +384,8 @@ public void testHAIDLookup() {
     assertEquals(conf.get(YarnConfiguration.RM_HA_ID), RM1_NODE_ID);
 
     //test if RM_HA_ID can not be found
-    configuration.set(YarnConfiguration.RM_HA_IDS, RM1_NODE_ID+ "," + RM3_NODE_ID);
+    configuration
+        .set(YarnConfiguration.RM_HA_IDS, RM1_NODE_ID + "," + RM3_NODE_ID);
     configuration.unset(YarnConfiguration.RM_HA_ID);
     conf = new YarnConfiguration(configuration);
     try {
@@ -456,7 +457,7 @@ public synchronized void startInternal() throws Exception {
     checkActiveRMFunctionality();
   }
 
-  @Test(timeout = 90000)
+  @Test
   public void testTransitionedToStandbyShouldNotHang() throws Exception {
     configuration.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
     Configuration conf = new YarnConfiguration(configuration);