tezConf.setLong(TezConfiguration.TEZ_AM_CONTAINER_SESSION_DELAY_ALLOCATION_MILLIS, 10000l);

    RackResolver.init(tezConf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = TezDAGID.getInstance("0", 0, 0);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient =

        spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(

        mock(ContainerHeartbeatHandler.class),

        mock(TaskAttemptListener.class),

        new ContainerContextMatcher(), appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal =

        new TaskSchedulerEventHandlerForTest(

          appContext, eventHandler, rmClient,

          new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler =

        spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(tezConf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler =

      (TaskSchedulerWithDrainableAppCallback)

        ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

        .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback =

      taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource1 = Resource.newInstance(1024, 1);

    String [] emptyHosts = new String[0];

    String [] racks = { "default-rack" };

    Priority priority = Priority.newInstance(3);

    TezVertexID vertexID = TezVertexID.getInstance(dagID, 1);

    //Vertex 1, Task 1, Attempt 1, no locality information.

    TezTaskAttemptID taID11 = TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexID, 1), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    doReturn(vertexID).when(ta11).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent11 = createLaunchRequestEvent(

      taID11, ta11, resource1, emptyHosts, racks, priority);

    //Vertex1, Task2, Attempt 1,  no locality information.

    TezTaskAttemptID taID12 = TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexID, 2), 1);

    TaskAttempt ta12 = mock(TaskAttempt.class);

    doReturn(vertexID).when(ta12).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent12 = createLaunchRequestEvent(

      taID12, ta12, resource1, emptyHosts, racks, priority);

    // Send launch request for task 1 only, deterministic assignment to this task.

    taskSchedulerEventHandler.handleEvent(lrEvent11);

    Container container1 = createContainer(1, "randomHost", resource1, priority);

    // One container allocated.

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Collections.singletonList(container1));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta11), any(Object.class), eq(container1));

    // Send launch request for task2 (vertex2)

    taskSchedulerEventHandler.handleEvent(lrEvent12);

    // Task assigned to container completed successfully.

    // Container should not be immediately assigned to task 2

    // until delay expires.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta11, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta11), eq(true));

    verify(taskSchedulerEventHandler, times(0)).taskAllocated(

      eq(ta12), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    Thread.sleep(1000l);

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta12), any(Object.class), eq(container1));

    // TA12 completed.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta12, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(rmClient).releaseAssignedContainer(eq(container1.getId()));

    taskScheduler.close();

    taskSchedulerEventHandler.close();

  }

      TezConfiguration.TEZ_AM_CONTAINER_SESSION_DELAY_ALLOCATION_MILLIS, 3000l);

    RackResolver.init(tezConf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = TezDAGID.getInstance("0", 0, 0);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient =

      spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(

      mock(ContainerHeartbeatHandler.class),

      mock(TaskAttemptListener.class),

      new ContainerContextMatcher(), appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(true).when(appContext).isSession();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal =

      new TaskSchedulerEventHandlerForTest(appContext, eventHandler, rmClient,

        new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler =

      spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(tezConf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler =

      (TaskSchedulerWithDrainableAppCallback)

        ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

          .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback = taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource1 = Resource.newInstance(1024, 1);

    String[] host1 = {"host1"};

    String []racks = {"/default-rack"};

    Priority priority1 = Priority.newInstance(3);

    Priority priority2 = Priority.newInstance(4);

    TezVertexID vertexID1 = TezVertexID.getInstance(dagID, 1);

    TezVertexID vertexID2 = TezVertexID.getInstance(dagID, 2);

    //Vertex 1, Task 1, Attempt 1, host1

    TezTaskAttemptID taID11 = TezTaskAttemptID.getInstance(

      TezTaskID.getInstance(vertexID1, 1), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    doReturn(vertexID1).when(ta11).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent11 = createLaunchRequestEvent(

      taID11, ta11, resource1, host1, racks, priority1);

    //Vertex2, Task1, Attempt 1, host1

    TezTaskAttemptID taID21 = TezTaskAttemptID.getInstance(

      TezTaskID.getInstance(vertexID2, 1), 1);

    TaskAttempt ta21 = mock(TaskAttempt.class);

    doReturn(vertexID2).when(ta21).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent21 = createLaunchRequestEvent(

      taID21, ta21, resource1, host1, racks, priority2);

    // Send launch request for task 1 onle, deterministic assignment to this task.

    taskSchedulerEventHandler.handleEvent(lrEvent11);

    Container container1 = createContainer(1, host1[0], resource1, priority1);

    // One container allocated.

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Collections.singletonList(container1));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta11), any(Object.class), eq(container1));

    // Send launch request for task2 (vertex2)

    taskSchedulerEventHandler.handleEvent(lrEvent21);

    // Task assigned to container completed successfully.

    // Container should  be assigned to task21.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta11, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta11), eq(true));

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta21), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    // Task 2 completes.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta21, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    Thread.sleep(5000l);

    verify(rmClient).releaseAssignedContainer(eq(container1.getId()));

    taskScheduler.close();

    taskSchedulerEventHandler.close();

  }

    tezConf.setLong(TezConfiguration.TEZ_AM_CONTAINER_SESSION_DELAY_ALLOCATION_MILLIS, -1);

    RackResolver.init(tezConf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID1 = TezDAGID.getInstance("0", 1, 0);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient = spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    ChangingDAGIDAnswer dagIDAnswer = new ChangingDAGIDAnswer(dagID1);

    AMContainerMap amContainerMap = new AMContainerMap(mock(ContainerHeartbeatHandler.class),

        mock(TaskAttemptListener.class), new ContainerContextMatcher(), appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(true).when(appContext).isSession();

    doAnswer(dagIDAnswer).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

   

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal = new TaskSchedulerEventHandlerForTest(appContext, eventHandler, rmClient, new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler = spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(tezConf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler = (TaskSchedulerWithDrainableAppCallback) ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

        .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback = taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource1 = Resource.newInstance(1024, 1);

    String[] host1 = {"host1"};

    String []racks = {"/default-rack"};

    Priority priority1 = Priority.newInstance(1);

    String rsrc1 = "rsrc1";

    String rsrc2 = "rsrc2";

    String rsrc3 = "rsrc3";

    LocalResource lr1 = mock(LocalResource.class);

    LocalResource lr2 = mock(LocalResource.class);

    LocalResource lr3 = mock(LocalResource.class);

   

    AMContainerEventAssignTA assignEvent = null;

   

    Map<String, LocalResource> dag1LRs = Maps.newHashMap();

    dag1LRs.put(rsrc1, lr1);

    TezVertexID vertexID11 = TezVertexID.getInstance(dagID1, 1);

   

    //Vertex 1, Task 1, Attempt 1, host1, lr1

    TezTaskAttemptID taID111 = TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexID11, 1), 1);

    TaskAttempt ta111 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent11 = createLaunchRequestEvent(taID111, ta111, resource1, host1, racks, priority1, dag1LRs);

    //Vertex 1, Task 2, Attempt 1, host1, lr1

    TezTaskAttemptID taID112 = TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexID11, 2), 1);

    TaskAttempt ta112 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent12 = createLaunchRequestEvent(taID112, ta112, resource1, host1, racks, priority1, dag1LRs);

    taskSchedulerEventHandler.handleEvent(lrEvent11);

    taskSchedulerEventHandler.handleEvent(lrEvent12);

    Container container1 = createContainer(1, "host1", resource1, priority1);

    // One container allocated.

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Collections.singletonList(container1));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta111), any(Object.class), eq(container1));

    assertEquals(1, assignEvent.getRemoteTaskLocalResources().size());

   

    // Task assigned to container completed successfully. Container should be re-used.

    taskSchedulerEventHandler.handleEvent(new AMSchedulerEventTAEnded(ta111, container1.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta111), eq(true));

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta112), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    assertEquals(1, assignEvent.getRemoteTaskLocalResources().size());

    // Task assigned to container completed successfully.

    // Verify reuse across hosts.

    taskSchedulerEventHandler.handleEvent(new AMSchedulerEventTAEnded(ta112, container1.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta112), eq(true));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    // Setup DAG2 with additional resources. Make sure the container, even without all resources, is reused.

    TezDAGID dagID2 = TezDAGID.getInstance("0", 2, 0);

    dagIDAnswer.setDAGID(dagID2);

   

    Map<String, LocalResource> dag2LRs = Maps.newHashMap();

    dag2LRs.put(rsrc2, lr2);

    dag2LRs.put(rsrc3, lr3);

   

    TezVertexID vertexID21 = TezVertexID.getInstance(dagID2, 1);

   

    //Vertex 2, Task 1, Attempt 1, host1, lr2

    TezTaskAttemptID taID211 = TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexID21, 1), 1);

    TaskAttempt ta211 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent21 = createLaunchRequestEvent(taID211, ta211, resource1, host1, racks, priority1, dag2LRs);

    //Vertex 2, Task 2, Attempt 1, host1, lr2

    TezTaskAttemptID taID212 = TezTaskAttemptID.getInstance(TezTaskID.getInstance(vertexID21, 2), 1);

    TaskAttempt ta212 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent22 = createLaunchRequestEvent(taID212, ta212, resource1, host1, racks, priority1, dag2LRs);

    taskSchedulerEventHandler.handleEvent(lrEvent21);

    taskSchedulerEventHandler.handleEvent(lrEvent22);

    drainableAppCallback.drain();

    // TODO This is terrible, need a better way to ensure the scheduling loop has run

    Thread.sleep(3000l);

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta211), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    assertEquals(2, assignEvent.getRemoteTaskLocalResources().size());

    taskSchedulerEventHandler.handleEvent(new AMSchedulerEventTAEnded(ta211, container1.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta211), eq(true));

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta212), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    assertEquals(2, assignEvent.getRemoteTaskLocalResources().size());

    taskScheduler.close();

    taskSchedulerEventHandler.close();

  }

      TezConfiguration.TEZ_AM_CONTAINER_REUSE_LOCALITY_DELAY_ALLOCATION_MILLIS, 3000l);

    RackResolver.init(conf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = new TezDAGID("0", 0, 0);

    TezVertexID vertexID = new TezVertexID(dagID, 1);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient =

      spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(

      mock(ContainerHeartbeatHandler.class),

      mock(TaskAttemptListener.class),

      appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal =

        new TaskSchedulerEventHandlerForTest(

          appContext, eventHandler, rmClient,

          new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler =

        spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(conf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler =

      (TaskSchedulerWithDrainableAppCallback)

        ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

        .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback =

      taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource = Resource.newInstance(1024, 1);

    Priority priority = Priority.newInstance(5);

    String [] host1 = {"host1"};

    String [] host2 = {"host2"};

    String [] defaultRack = {"/default-rack"};

    TezTaskAttemptID taID11 = new TezTaskAttemptID(

      new TezTaskID(vertexID, 1), 1);

    TezTaskAttemptID taID21 = new TezTaskAttemptID(

      new TezTaskID(vertexID, 2), 1);

    TezTaskAttemptID taID31 = new TezTaskAttemptID(

      new TezTaskID(vertexID, 3), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    TaskAttempt ta21 = mock(TaskAttempt.class);

    TaskAttempt ta31 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrTa11 =

      createLaunchRequestEvent(taID11, ta11, resource, host1,

        defaultRack, priority);

    AMSchedulerEventTALaunchRequest lrTa21 =

      createLaunchRequestEvent(taID21, ta21, resource, host2,

        defaultRack, priority);

    AMSchedulerEventTALaunchRequest lrTa31 =

      createLaunchRequestEvent(taID31, ta31, resource, host1,

        defaultRack, priority);

    taskSchedulerEventHandler.handleEvent(lrTa11);

    taskSchedulerEventHandler.handleEvent(lrTa21);

    Container containerHost1 = createContainer(1, host1[0], resource, priority);

    Container containerHost2 = createContainer(2, host2[0], resource, priority);

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(

      Lists.newArrayList(containerHost1, containerHost2));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta11), any(Object.class), eq(containerHost1));

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta21), any(Object.class), eq(containerHost2));

    // Adding the event later so that task1 assigned to containerHost1

    // is deterministic.

    taskSchedulerEventHandler.handleEvent(lrTa31);

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(

        ta11, containerHost1.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta11), eq(true));

    verify(taskSchedulerEventHandler, times(1)).taskAllocated(

      eq(ta31), any(Object.class), eq(containerHost1));

    verify(rmClient, times(0)).releaseAssignedContainer(

      eq(containerHost1.getId()));

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta21, containerHost2.getId(),

        TaskAttemptState.SUCCEEDED));

    conf.setLong(TezConfiguration.TEZ_AM_CONTAINER_REUSE_LOCALITY_DELAY_ALLOCATION_MILLIS, 1000l);

    RackResolver.init(conf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = new TezDAGID("0", 0, 0);

    TezVertexID vertexID = new TezVertexID(dagID, 1);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient =

      spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(

      mock(ContainerHeartbeatHandler.class),

      mock(TaskAttemptListener.class),

      appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal =

      new TaskSchedulerEventHandlerForTest(appContext, eventHandler, rmClient,

        new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler =

      spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(conf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler =

      (TaskSchedulerWithDrainableAppCallback)

        ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

          .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback =

      taskScheduler.getDrainableAppCallback();

   

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource = Resource.newInstance(1024, 1);

    Priority priority = Priority.newInstance(5);

    String [] host1 = {"host1"};

    String [] host2 = {"host2"};

    String [] defaultRack = {"/default-rack"};

    TezTaskAttemptID taID11 = new TezTaskAttemptID(new TezTaskID(vertexID, 1), 1);

    TezTaskAttemptID taID21 = new TezTaskAttemptID(new TezTaskID(vertexID, 2), 1);

    TezTaskAttemptID taID31 = new TezTaskAttemptID(new TezTaskID(vertexID, 3), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    TaskAttempt ta21 = mock(TaskAttempt.class);

    TaskAttempt ta31 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrTa11 = createLaunchRequestEvent(

      taID11, ta11, resource, host1, defaultRack, priority);

    AMSchedulerEventTALaunchRequest lrTa21 = createLaunchRequestEvent(

      taID21, ta21, resource, host2, defaultRack, priority);

    AMSchedulerEventTALaunchRequest lrTa31 = createLaunchRequestEvent(

      taID31, ta31, resource, host1, defaultRack, priority);

    taskSchedulerEventHandler.handleEvent(lrTa11);

    taskSchedulerEventHandler.handleEvent(lrTa21);

    Container containerHost1 = createContainer(1, host1[0], resource, priority);

    Container containerHost2 = createContainer(2, host2[0], resource, priority);

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Lists.newArrayList(containerHost1, containerHost2));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta11), any(Object.class), eq(containerHost1));

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta21), any(Object.class), eq(containerHost2));

    // Adding the event later so that task1 assigned to containerHost1 is deterministic.

    taskSchedulerEventHandler.handleEvent(lrTa31);

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta21, containerHost2.getId(),

        TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta21), eq(true));

    verify(taskSchedulerEventHandler, times(0)).taskAllocated(

      eq(ta31), any(Object.class), eq(containerHost2));

    verify(rmClient, times(1)).releaseAssignedContainer(

      eq(containerHost2.getId()));

    taskScheduler.stop();

    taskScheduler.close();

    taskSchedulerEventHandler.close();

  }

    tezConf.setLong(TezConfiguration.TEZ_AM_CONTAINER_SESSION_DELAY_ALLOCATION_MILLIS, 0);

    RackResolver.init(tezConf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = new TezDAGID("0", 0, 0);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient = spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(mock(ContainerHeartbeatHandler.class), mock(TaskAttemptListener.class), appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal = new TaskSchedulerEventHandlerForTest(appContext, eventHandler, rmClient, new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler = spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(tezConf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler = (TaskSchedulerWithDrainableAppCallback) ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

        .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback = taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource1 = Resource.newInstance(1024, 1);

    String[] host1 = {"host1"};

    String[] host2 = {"host2"};

    String []racks = {"/default-rack"};

    Priority priority1 = Priority.newInstance(1);

    TezVertexID vertexID1 = new TezVertexID(dagID, 1);

    //Vertex 1, Task 1, Attempt 1, host1

    TezTaskAttemptID taID11 = new TezTaskAttemptID(new TezTaskID(vertexID1, 1), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent1 = createLaunchRequestEvent(taID11, ta11, resource1, host1, racks, priority1);

    //Vertex 1, Task 2, Attempt 1, host1

    TezTaskAttemptID taID12 = new TezTaskAttemptID(new TezTaskID(vertexID1, 2), 1);

    TaskAttempt ta12 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent2 = createLaunchRequestEvent(taID12, ta12, resource1, host1, racks, priority1);

    //Vertex 1, Task 3, Attempt 1, host2

    TezTaskAttemptID taID13 = new TezTaskAttemptID(new TezTaskID(vertexID1, 3), 1);

    TaskAttempt ta13 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent3 = createLaunchRequestEvent(taID13, ta13, resource1, host2, racks, priority1);

    //Vertex 1, Task 4, Attempt 1, host2

    TezTaskAttemptID taID14 = new TezTaskAttemptID(new TezTaskID(vertexID1, 4), 1);

    TaskAttempt ta14 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrEvent4 = createLaunchRequestEvent(taID14, ta14, resource1, host2, racks, priority1);

    taskSchedulerEventHandler.handleEvent(lrEvent1);

    taskSchedulerEventHandler.handleEvent(lrEvent2);

    taskSchedulerEventHandler.handleEvent(lrEvent3);

    taskSchedulerEventHandler.handleEvent(lrEvent4);

    Container container1 = createContainer(1, "host1", resource1, priority1);

    // One container allocated.

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Collections.singletonList(container1));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta11), any(Object.class), eq(container1));

    // Task assigned to container completed successfully. Container should be re-used.

    taskSchedulerEventHandler.handleEvent(new AMSchedulerEventTAEnded(ta11, container1.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta11), eq(true));

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta12), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    // Task assigned to container completed successfully.

    // Verify reuse across hosts.

    taskSchedulerEventHandler.handleEvent(new AMSchedulerEventTAEnded(ta12, container1.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta12), eq(true));

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta13), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    // Verify no re-use if a previous task fails.

    taskSchedulerEventHandler.handleEvent(new AMSchedulerEventTAEnded(ta13, container1.getId(), TaskAttemptState.FAILED));

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler, times(0)).taskAllocated(eq(ta14), any(Object.class), eq(container1));

    verify(taskScheduler).deallocateTask(eq(ta13), eq(false));

    verify(rmClient).releaseAssignedContainer(eq(container1.getId()));

    Container container2 = createContainer(2, "host2", resource1, priority1);

    // Second container allocated. Should be allocated to the last task.

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Collections.singletonList(container2));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(eq(ta14), any(Object.class), eq(container2));

    // Task assigned to container completed successfully. No pending requests. Container should be released.

    taskSchedulerEventHandler.handleEvent(new AMSchedulerEventTAEnded(ta14, container2.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta14), eq(true));

    verify(rmClient).releaseAssignedContainer(eq(container2.getId()));

    taskScheduler.close();

    taskSchedulerEventHandler.close();

  }

    tezConf.setLong(TezConfiguration.TEZ_AM_CONTAINER_SESSION_DELAY_ALLOCATION_MILLIS, 10000l);

    RackResolver.init(tezConf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = new TezDAGID("0", 0, 0);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient =

        spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(

        mock(ContainerHeartbeatHandler.class),

        mock(TaskAttemptListener.class), appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal =

        new TaskSchedulerEventHandlerForTest(

          appContext, eventHandler, rmClient,

          new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler =

        spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(tezConf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler =

      (TaskSchedulerWithDrainableAppCallback)

        ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

        .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback =

      taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource1 = Resource.newInstance(1024, 1);

    String [] emptyHosts = new String[0];

    String [] racks = { "default-rack" };

    Priority priority = Priority.newInstance(3);

    TezVertexID vertexID = new TezVertexID(dagID, 1);

    //Vertex 1, Task 1, Attempt 1, no locality information.

    TezTaskAttemptID taID11 = new TezTaskAttemptID(new TezTaskID(vertexID, 1), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    doReturn(vertexID).when(ta11).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent11 = createLaunchRequestEvent(

      taID11, ta11, resource1, emptyHosts, racks, priority);

    //Vertex1, Task2, Attempt 1,  no locality information.

    TezTaskAttemptID taID12 = new TezTaskAttemptID(new TezTaskID(vertexID, 2), 1);

    TaskAttempt ta12 = mock(TaskAttempt.class);

    doReturn(vertexID).when(ta12).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent12 = createLaunchRequestEvent(

      taID12, ta12, resource1, emptyHosts, racks, priority);

    // Send launch request for task 1 only, deterministic assignment to this task.

    taskSchedulerEventHandler.handleEvent(lrEvent11);

    Container container1 = createContainer(1, "randomHost", resource1, priority);

    // One container allocated.

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Collections.singletonList(container1));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta11), any(Object.class), eq(container1));

    // Send launch request for task2 (vertex2)

    taskSchedulerEventHandler.handleEvent(lrEvent12);

    // Task assigned to container completed successfully.

    // Container should not be immediately assigned to task 2

    // until delay expires.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta11, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta11), eq(true));

    verify(taskSchedulerEventHandler, times(0)).taskAllocated(

      eq(ta12), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    Thread.sleep(1000l);

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta12), any(Object.class), eq(container1));

    // TA12 completed.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta12, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(rmClient).releaseAssignedContainer(eq(container1.getId()));

    taskScheduler.close();

    taskSchedulerEventHandler.close();

  }

      TezConfiguration.TEZ_AM_CONTAINER_SESSION_DELAY_ALLOCATION_MILLIS, 3000l);

    RackResolver.init(tezConf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = new TezDAGID("0", 0, 0);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient =

      spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(

      mock(ContainerHeartbeatHandler.class),

      mock(TaskAttemptListener.class), appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(true).when(appContext).isSession();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal =

      new TaskSchedulerEventHandlerForTest(appContext, eventHandler, rmClient,

        new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler =

      spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(tezConf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler =

      (TaskSchedulerWithDrainableAppCallback)

        ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

          .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback = taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource1 = Resource.newInstance(1024, 1);

    String[] host1 = {"host1"};

    String []racks = {"/default-rack"};

    Priority priority1 = Priority.newInstance(3);

    Priority priority2 = Priority.newInstance(4);

    TezVertexID vertexID1 = new TezVertexID(dagID, 1);

    TezVertexID vertexID2 = new TezVertexID(dagID, 2);

    //Vertex 1, Task 1, Attempt 1, host1

    TezTaskAttemptID taID11 = new TezTaskAttemptID(

      new TezTaskID(vertexID1, 1), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    doReturn(vertexID1).when(ta11).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent11 = createLaunchRequestEvent(

      taID11, ta11, resource1, host1, racks, priority1);

    //Vertex2, Task1, Attempt 1, host1

    TezTaskAttemptID taID21 = new TezTaskAttemptID(

      new TezTaskID(vertexID2, 1), 1);

    TaskAttempt ta21 = mock(TaskAttempt.class);

    doReturn(vertexID2).when(ta21).getVertexID();

    AMSchedulerEventTALaunchRequest lrEvent21 = createLaunchRequestEvent(

      taID21, ta21, resource1, host1, racks, priority2);

    // Send launch request for task 1 onle, deterministic assignment to this task.

    taskSchedulerEventHandler.handleEvent(lrEvent11);

    Container container1 = createContainer(1, host1[0], resource1, priority1);

    // One container allocated.

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(Collections.singletonList(container1));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta11), any(Object.class), eq(container1));

    // Send launch request for task2 (vertex2)

    taskSchedulerEventHandler.handleEvent(lrEvent21);

    // Task assigned to container completed successfully.

    // Container should  be assigned to task21.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta11, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta11), eq(true));

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta21), any(Object.class), eq(container1));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    // Task 2 completes.

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(ta21, container1.getId(),

        TaskAttemptState.SUCCEEDED));

    verify(rmClient, times(0)).releaseAssignedContainer(eq(container1.getId()));

    Thread.sleep(5000l);

    verify(rmClient).releaseAssignedContainer(eq(container1.getId()));

    taskScheduler.close();

    taskSchedulerEventHandler.close();

  }

      TezConfiguration.TEZ_AM_CONTAINER_REUSE_LOCALITY_DELAY_ALLOCATION_MILLIS, 3000l);

    RackResolver.init(conf);

    TaskSchedulerAppCallback mockApp = mock(TaskSchedulerAppCallback.class);

    TezDAGID dagID = TezDAGID.getInstance("0", 0, 0);

    TezVertexID vertexID = TezVertexID.getInstance(dagID, 1);

    AMRMClient<CookieContainerRequest> rmClientCore = new AMRMClientForTest();

    TezAMRMClientAsync<CookieContainerRequest> rmClient =

      spy(new AMRMClientAsyncForTest(rmClientCore, 100));

    String appUrl = "url";

    String appMsg = "success";

    AppFinalStatus finalStatus =

        new AppFinalStatus(FinalApplicationStatus.SUCCEEDED, appMsg, appUrl);

    doReturn(finalStatus).when(mockApp).getFinalAppStatus();

    AppContext appContext = mock(AppContext.class);

    AMContainerMap amContainerMap = new AMContainerMap(

      mock(ContainerHeartbeatHandler.class),

      mock(TaskAttemptListener.class),

      new ContainerContextMatcher(), appContext);

    AMNodeMap amNodeMap = new AMNodeMap(eventHandler, appContext);

    doReturn(amContainerMap).when(appContext).getAllContainers();

    doReturn(DAGAppMasterState.RUNNING).when(appContext).getAMState();

    doReturn(amNodeMap).when(appContext).getAllNodes();

    doReturn(dagID).when(appContext).getCurrentDAGID();

    doReturn(mock(ClusterInfo.class)).when(appContext).getClusterInfo();

    TaskSchedulerEventHandler taskSchedulerEventHandlerReal =

        new TaskSchedulerEventHandlerForTest(

          appContext, eventHandler, rmClient,

          new AlwaysMatchesContainerMatcher());

    TaskSchedulerEventHandler taskSchedulerEventHandler =

        spy(taskSchedulerEventHandlerReal);

    taskSchedulerEventHandler.init(conf);

    taskSchedulerEventHandler.start();

    TaskSchedulerWithDrainableAppCallback taskScheduler =

      (TaskSchedulerWithDrainableAppCallback)

        ((TaskSchedulerEventHandlerForTest) taskSchedulerEventHandler)

        .getSpyTaskScheduler();

    TaskSchedulerAppCallbackDrainable drainableAppCallback =

      taskScheduler.getDrainableAppCallback();

    AtomicBoolean drainNotifier = new AtomicBoolean(false);

    taskScheduler.delayedContainerManager.drainedDelayedContainers = drainNotifier;

    Resource resource = Resource.newInstance(1024, 1);

    Priority priority = Priority.newInstance(5);

    String [] host1 = {"host1"};

    String [] host2 = {"host2"};

    String [] defaultRack = {"/default-rack"};

    TezTaskAttemptID taID11 = TezTaskAttemptID.getInstance(

      TezTaskID.getInstance(vertexID, 1), 1);

    TezTaskAttemptID taID21 = TezTaskAttemptID.getInstance(

      TezTaskID.getInstance(vertexID, 2), 1);

    TezTaskAttemptID taID31 = TezTaskAttemptID.getInstance(

      TezTaskID.getInstance(vertexID, 3), 1);

    TaskAttempt ta11 = mock(TaskAttempt.class);

    TaskAttempt ta21 = mock(TaskAttempt.class);

    TaskAttempt ta31 = mock(TaskAttempt.class);

    AMSchedulerEventTALaunchRequest lrTa11 =

      createLaunchRequestEvent(taID11, ta11, resource, host1,

        defaultRack, priority);

    AMSchedulerEventTALaunchRequest lrTa21 =

      createLaunchRequestEvent(taID21, ta21, resource, host2,

        defaultRack, priority);

    AMSchedulerEventTALaunchRequest lrTa31 =

      createLaunchRequestEvent(taID31, ta31, resource, host1,

        defaultRack, priority);

    taskSchedulerEventHandler.handleEvent(lrTa11);

    taskSchedulerEventHandler.handleEvent(lrTa21);

    Container containerHost1 = createContainer(1, host1[0], resource, priority);

    Container containerHost2 = createContainer(2, host2[0], resource, priority);

    drainNotifier.set(false);

    taskScheduler.onContainersAllocated(

      Lists.newArrayList(containerHost1, containerHost2));

    TestTaskSchedulerHelpers.waitForDelayedDrainNotify(drainNotifier);

    drainableAppCallback.drain();

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta11), any(Object.class), eq(containerHost1));

    verify(taskSchedulerEventHandler).taskAllocated(

      eq(ta21), any(Object.class), eq(containerHost2));

    // Adding the event later so that task1 assigned to containerHost1

    // is deterministic.

    taskSchedulerEventHandler.handleEvent(lrTa31);

    taskSchedulerEventHandler.handleEvent(

      new AMSchedulerEventTAEnded(

        ta11, containerHost1.getId(), TaskAttemptState.SUCCEEDED));

    drainableAppCallback.drain();

    verify(taskScheduler).deallocateTask(eq(ta11), eq(true));

    verify(taskSchedulerEventHandler, times(1)).taskAllocated(

      eq(ta31), any(Object.class), eq(containerHost1));

    verify(rmClient, times(0)).releaseAssignedContainer(

      eq(containerHost1.getId()));