YARN-1816. Fixed ResourceManager to get RMApp correctly handle ATTEMPT_FINISHED event at ACCEPTED state that can happen after RM restarts. Contributed by Jian He.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1576911 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -457,6 +457,10 @@ Release 2.4.0 - UNRELEASED
     and thus recover app itself synchronously and avoid races with resyncing
     NodeManagers. (Jian He via vinodkv)
 
+    YARN-1816. Fixed ResourceManager to get RMApp correctly handle
+    ATTEMPT_FINISHED event at ACCEPTED state that can happen after RM restarts.
+    (Jian He via vinodkv)
+
 Release 2.3.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -189,11 +189,14 @@ RMAppEventType.MOVE, new RMAppMoveTransition())
         RMAppEventType.ATTEMPT_REGISTERED)
     .addTransition(RMAppState.ACCEPTED,
         EnumSet.of(RMAppState.ACCEPTED, RMAppState.FINAL_SAVING),
-        // ACCEPTED state is possible to receive ATTEMPT_FAILED event because
+        // ACCEPTED state is possible to receive ATTEMPT_FAILED/ATTEMPT_FINISHED
-        // RMAppRecoveredTransition is returning ACCEPTED state directly and
+        // event because RMAppRecoveredTransition is returning ACCEPTED state
-        // waiting for the previous AM to exit.
+        // directly and waiting for the previous AM to exit.
         RMAppEventType.ATTEMPT_FAILED,
         new AttemptFailedTransition(RMAppState.ACCEPTED))
+    .addTransition(RMAppState.ACCEPTED, RMAppState.FINAL_SAVING,
+        RMAppEventType.ATTEMPT_FINISHED,
+        new FinalSavingTransition(FINISHED_TRANSITION, RMAppState.FINISHED))
     .addTransition(RMAppState.ACCEPTED, RMAppState.KILLING,
         RMAppEventType.KILL, new KillAttemptTransition())
     // ACCECPTED state can once again receive APP_ACCEPTED event, because on
@@ -725,11 +728,7 @@ private static final class RMAppRecoveredTransition implements
 
     @Override
     public RMAppState transition(RMAppImpl app, RMAppEvent event) {
-      /*
+
-       * If last attempt recovered final state is null .. it means attempt was
-       * started but AM container may or may not have started / finished.
-       * Therefore we should wait for it to finish.
-       */
       for (RMAppAttempt attempt : app.getAppAttempts().values()) {
         // synchronously recover attempt to ensure any incoming external events
         // to be processed after the attempt processes the recover event.
@@ -744,6 +743,17 @@ public RMAppState transition(RMAppImpl app, RMAppEvent event) {
         return app.recoveredFinalState;
       }
 
+      // Last attempt is in final state, do not add to scheduler and just return
+      // ACCEPTED waiting for last RMAppAttempt to send finished or failed event
+      // back.
+      if (app.currentAttempt != null
+          && (app.currentAttempt.getState() == RMAppAttemptState.KILLED
+              || app.currentAttempt.getState() == RMAppAttemptState.FINISHED
+              || (app.currentAttempt.getState() == RMAppAttemptState.FAILED
+                  && app.attempts.size() == app.maxAppAttempts))) {
+        return RMAppState.ACCEPTED;
+      }
+
       // Notify scheduler about the app on recovery
       new AddApplicationToSchedulerTransition().transition(app, event);
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptImpl.java

@@ -872,6 +872,11 @@ private static class AttemptRecoveredTransition
     @Override
     public RMAppAttemptState transition(RMAppAttemptImpl appAttempt,
         RMAppAttemptEvent event) {
+      /*
+       * If last attempt recovered final state is null .. it means attempt was
+       * started but AM container may or may not have started / finished.
+       * Therefore we should wait for it to finish.
+       */
       if (appAttempt.recoveredFinalState != null) {
         appAttempt.progress = 1.0f;
         RMApp rmApp =appAttempt.rmContext.getRMApps().get(

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

@@ -601,7 +601,63 @@ public void testRMRestartWaitForPreviousAMToFinish() throws Exception {
         RMAppAttemptState.SCHEDULED);
     Assert.assertEquals(RMAppAttemptState.SCHEDULED, app2
         .getCurrentAppAttempt().getAppAttemptState());
+  }
 
+  // Test RM restarts after previous attempt succeeded and was saved into state
+  // store but before the RMAppAttempt notifies RMApp that it has succeeded. On
+  // recovery, RMAppAttempt should send the AttemptFinished event to RMApp so
+  // that RMApp can recover its state.
+  @Test
+  public void testRMRestartWaitForPreviousSucceededAttempt() throws Exception {
+    conf.setInt(YarnConfiguration.RM_AM_MAX_ATTEMPTS, 2);
+    MemoryRMStateStore memStore = new MemoryRMStateStore() {
+      int count = 0;
+
+      @Override
+      public void updateApplicationStateInternal(ApplicationId appId,
+          ApplicationStateDataPBImpl appStateData) throws Exception {
+        if (count == 0) {
+          // do nothing; simulate app final state is not saved.
+          LOG.info(appId + " final state is not saved.");
+          count++;
+        } else {
+          super.updateApplicationStateInternal(appId, appStateData);
+        }
+      }
+    };
+    memStore.init(conf);
+    RMState rmState = memStore.getState();
+    Map<ApplicationId, ApplicationState> rmAppState =
+        rmState.getApplicationState();
+
+    // start RM
+    MockRM rm1 = new MockRM(conf, memStore);
+    rm1.start();
+    MockNM nm1 = rm1.registerNode("127.0.0.1:1234", 15120);
+    RMApp app0 = rm1.submitApp(200);
+    MockAM am0 = MockRM.launchAndRegisterAM(app0, rm1, nm1);
+
+    FinishApplicationMasterRequest req =
+        FinishApplicationMasterRequest.newInstance(
+          FinalApplicationStatus.SUCCEEDED, "", "");
+    am0.unregisterAppAttempt(req, true);
+    am0.waitForState(RMAppAttemptState.FINISHING);
+    // app final state is not saved. This guarantees that RMApp cannot be
+    // recovered via its own saved state, but only via the event notification
+    // from the RMAppAttempt on recovery.
+    Assert.assertNull(rmAppState.get(app0.getApplicationId()).getState());
+
+    // start RM
+    MockRM rm2 = new MockRM(conf, memStore);
+    nm1.setResourceTrackerService(rm2.getResourceTrackerService());
+    rm2.start();
+
+    rm2.waitForState(app0.getCurrentAppAttempt().getAppAttemptId(),
+      RMAppAttemptState.FINISHED);
+    rm2.waitForState(app0.getApplicationId(), RMAppState.FINISHED);
+    // app final state is saved via the finish event from attempt.
+    Assert.assertEquals(RMAppState.FINISHED,
+      rmAppState.get(app0.getApplicationId()).getState());
   }
 
   @Test