YARN-2588. Standby RM fails to transitionToActive if previous transitionToActive failed with ZK exception. Contributed by Rohith Sharmaks

hadoop-yarn-project/CHANGES.txt

@@ -677,6 +677,9 @@ Release 2.6.0 - UNRELEASED
     YARN-2566. DefaultContainerExecutor should pick a working directory randomly. 
     (Zhihai Xu via kasha)
 
+    YARN-2588. Standby RM fails to transitionToActive if previous
+    transitionToActive failed with ZK exception. (Rohith Sharmaks via jianhe)
+
 Release 2.5.1 - 2014-09-05
 
   INCOMPATIBLE CHANGES

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

@@ -1023,8 +1023,14 @@ synchronized void transitionToActive() throws Exception {
     this.rmLoginUGI.doAs(new PrivilegedExceptionAction<Void>() {
       @Override
       public Void run() throws Exception {
-        startActiveServices();
+        try {
-        return null;
+          startActiveServices();
+          return null;
+        } catch (Exception e) {
+          resetDispatcher();
+          createAndInitActiveServices();
+          throw e;
+        }
       }
     });
 

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

@@ -47,6 +47,7 @@
 import org.apache.hadoop.yarn.event.Dispatcher;
 import org.apache.hadoop.yarn.event.EventHandler;
 import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
+import org.apache.hadoop.yarn.server.resourcemanager.recovery.MemoryRMStateStore;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttempt;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptState;
@@ -398,6 +399,57 @@ public void testHAWithRMHostName() throws Exception {
     innerTestHAWithRMHostName(true);
   }
 
+  @Test(timeout = 30000)
+  public void testFailoverWhenTransitionToActiveThrowException()
+      throws Exception {
+    configuration.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
+    Configuration conf = new YarnConfiguration(configuration);
+
+    MemoryRMStateStore memStore = new MemoryRMStateStore() {
+      int count = 0;
+
+      @Override
+      public synchronized void startInternal() throws Exception {
+        // first time throw exception
+        if (count++ == 0) {
+          throw new Exception("Session Expired");
+        }
+      }
+    };
+    // start RM
+    memStore.init(conf);
+
+    rm = new MockRM(conf, memStore);
+    rm.init(conf);
+    StateChangeRequestInfo requestInfo =
+        new StateChangeRequestInfo(
+            HAServiceProtocol.RequestSource.REQUEST_BY_USER);
+
+    assertEquals(STATE_ERR, HAServiceState.INITIALIZING, rm.adminService
+        .getServiceStatus().getState());
+    assertFalse("RM is ready to become active before being started",
+        rm.adminService.getServiceStatus().isReadyToBecomeActive());
+    checkMonitorHealth();
+
+    rm.start();
+    checkMonitorHealth();
+    checkStandbyRMFunctionality();
+
+    // 2. Try Transition to active, throw exception
+    try {
+      rm.adminService.transitionToActive(requestInfo);
+      Assert.fail("Transitioned to Active should throw exception.");
+    } catch (Exception e) {
+      assertTrue("Error when transitioning to Active mode".contains(e
+          .getMessage()));
+    }
+
+    // 3. Transition to active, success
+    rm.adminService.transitionToActive(requestInfo);
+    checkMonitorHealth();
+    checkActiveRMFunctionality();
+  }
+
   public void innerTestHAWithRMHostName(boolean includeBindHost) {
     //this is run two times, with and without a bind host configured
     if (includeBindHost) {