/**
 * 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.junit.Before;
import static org.mockito.Matchers.argThat;
import static org.mockito.Mockito.doNothing;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.spy;

import java.util.ArrayList;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueMetrics;
import org.junit.After;
import org.junit.Assert;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.yarn.api.protocolrecords.AllocateResponse;
import org.apache.hadoop.yarn.api.protocolrecords.FinishApplicationMasterRequest;
import org.apache.hadoop.yarn.api.protocolrecords.GetApplicationReportRequest;
import org.apache.hadoop.yarn.api.protocolrecords.GetApplicationsRequest;
import org.apache.hadoop.yarn.api.protocolrecords.GetApplicationsResponse;
import org.apache.hadoop.yarn.api.protocolrecords.GetNewApplicationResponse;
import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationRequest;
import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.ApplicationReport;
import org.apache.hadoop.yarn.api.records.Container;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.ContainerState;
import org.apache.hadoop.yarn.api.records.FinalApplicationStatus;
import org.apache.hadoop.yarn.api.records.NMToken;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.ResourceRequest;
import org.apache.hadoop.yarn.api.records.Token;
import org.apache.hadoop.yarn.api.records.YarnApplicationState;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.event.AbstractEvent;
import org.apache.hadoop.yarn.event.AsyncDispatcher;
import org.apache.hadoop.yarn.event.Dispatcher;
import org.apache.hadoop.yarn.event.EventHandler;
import org.apache.hadoop.yarn.server.resourcemanager.TestRMRestart.TestSecurityMockRM;
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.RMAppEvent;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppEventType;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppState;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttempt;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptEvent;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptEventType;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptState;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
import org.apache.hadoop.yarn.server.resourcemanager.security.NMTokenSecretManagerInRM;
import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.junit.Test;
import org.mockito.ArgumentMatcher;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

@SuppressWarnings({"unchecked", "rawtypes"})
public class TestRM extends ParameterizedSchedulerTestBase {
  private static final Log LOG = LogFactory.getLog(TestRM.class);

  // Milliseconds to sleep for when waiting for something to happen
  private final static int WAIT_SLEEP_MS = 100;

  private YarnConfiguration conf;

  public TestRM(SchedulerType type) {
    super(type);
  }

  @Before
  public void setup() {
    conf = getConf();
  }

  @After
  public void tearDown() {
    ClusterMetrics.destroy();
    QueueMetrics.clearQueueMetrics();
    DefaultMetricsSystem.shutdown();
  }

  @Test
  public void testGetNewAppId() throws Exception {
    Logger rootLogger = LogManager.getRootLogger();
    rootLogger.setLevel(Level.DEBUG);
    MockRM rm = new MockRM(conf);
    rm.start();
    
    GetNewApplicationResponse resp = rm.getNewAppId();
    assert (resp.getApplicationId().getId() != 0);    
    assert (resp.getMaximumResourceCapability().getMemory() > 0);    
    rm.stop();
  }
  
  @Test (timeout = 30000)
  public void testAppWithNoContainers() throws Exception {
    Logger rootLogger = LogManager.getRootLogger();
    rootLogger.setLevel(Level.DEBUG);
    MockRM rm = new MockRM(conf);
    rm.start();
    MockNM nm1 = rm.registerNode("h1:1234", 5120);
    
    RMApp app = rm.submitApp(2000);

    //kick the scheduling
    nm1.nodeHeartbeat(true);

    RMAppAttempt attempt = app.getCurrentAppAttempt();
    MockAM am = rm.sendAMLaunched(attempt.getAppAttemptId());
    am.registerAppAttempt();
    am.unregisterAppAttempt();
    nm1.nodeHeartbeat(attempt.getAppAttemptId(), 1, ContainerState.COMPLETE);
    am.waitForState(RMAppAttemptState.FINISHED);
    rm.stop();
  }

  @Test (timeout = 30000)
  public void testAppOnMultiNode() throws Exception {
    Logger rootLogger = LogManager.getRootLogger();
    rootLogger.setLevel(Level.DEBUG);
    conf.set("yarn.scheduler.capacity.node-locality-delay", "-1");
    MockRM rm = new MockRM(conf);
    rm.start();
    MockNM nm1 = rm.registerNode("h1:1234", 5120);
    MockNM nm2 = rm.registerNode("h2:5678", 10240);
    
    RMApp app = rm.submitApp(2000);

    //kick the scheduling
    nm1.nodeHeartbeat(true);

    RMAppAttempt attempt = app.getCurrentAppAttempt();
    MockAM am = rm.sendAMLaunched(attempt.getAppAttemptId());
    am.registerAppAttempt();
    
    //request for containers
    int request = 13;
    am.allocate("h1" , 1000, request, new ArrayList<ContainerId>());
    
    //kick the scheduler
    List<Container> conts = am.allocate(new ArrayList<ResourceRequest>(),
        new ArrayList<ContainerId>()).getAllocatedContainers();
    int contReceived = conts.size();
    while (contReceived < 3) {//only 3 containers are available on node1
      nm1.nodeHeartbeat(true);
      conts.addAll(am.allocate(new ArrayList<ResourceRequest>(),
          new ArrayList<ContainerId>()).getAllocatedContainers());
      contReceived = conts.size();
      LOG.info("Got " + contReceived + " containers. Waiting to get " + 3);
      Thread.sleep(WAIT_SLEEP_MS);
    }
    Assert.assertEquals(3, conts.size());

    //send node2 heartbeat
    conts = am.allocate(new ArrayList<ResourceRequest>(),
        new ArrayList<ContainerId>()).getAllocatedContainers();
    contReceived = conts.size();
    while (contReceived < 10) {
      nm2.nodeHeartbeat(true);
      conts.addAll(am.allocate(new ArrayList<ResourceRequest>(),
          new ArrayList<ContainerId>()).getAllocatedContainers());
      contReceived = conts.size();
      LOG.info("Got " + contReceived + " containers. Waiting to get " + 10);
      Thread.sleep(WAIT_SLEEP_MS);
    }
    Assert.assertEquals(10, conts.size());

    am.unregisterAppAttempt();
    nm1.nodeHeartbeat(attempt.getAppAttemptId(), 1, ContainerState.COMPLETE);
    am.waitForState(RMAppAttemptState.FINISHED);

    rm.stop();
  }

  // Test even if AM container is allocated with containerId not equal to 1, the
  // following allocate requests from AM should be able to retrieve the
  // corresponding NM Token.
  @Test (timeout = 20000)
  public void testNMTokenSentForNormalContainer() throws Exception {
    conf.set(YarnConfiguration.RM_SCHEDULER,
        CapacityScheduler.class.getCanonicalName());
    MockRM rm = new MockRM(conf);
    rm.start();
    MockNM nm1 = rm.registerNode("h1:1234", 5120);
    RMApp app = rm.submitApp(2000);
    RMAppAttempt attempt = app.getCurrentAppAttempt();

    // Call getNewContainerId to increase container Id so that the AM container
    // Id doesn't equal to one.
    CapacityScheduler cs = (CapacityScheduler) rm.getResourceScheduler();
    cs.getApplicationAttempt(attempt.getAppAttemptId()).getNewContainerId();

    // kick the scheduling
    nm1.nodeHeartbeat(true);
    MockAM am = MockRM.launchAM(app, rm, nm1);
    // am container Id not equal to 1.
    Assert.assertTrue(
        attempt.getMasterContainer().getId().getContainerId() != 1);
    // NMSecretManager doesn't record the node on which the am is allocated.
    Assert.assertFalse(rm.getRMContext().getNMTokenSecretManager()
      .isApplicationAttemptNMTokenPresent(attempt.getAppAttemptId(),
        nm1.getNodeId()));
    am.registerAppAttempt();
    rm.waitForState(app.getApplicationId(), RMAppState.RUNNING);

    int NUM_CONTAINERS = 1;
    List<Container> containers = new ArrayList<Container>();
    // nmTokens keeps track of all the nmTokens issued in the allocate call.
    List<NMToken> expectedNMTokens = new ArrayList<NMToken>();

    // am1 allocate 1 container on nm1.
    while (true) {
      AllocateResponse response =
          am.allocate("127.0.0.1", 2000, NUM_CONTAINERS,
            new ArrayList<ContainerId>());
      nm1.nodeHeartbeat(true);
      containers.addAll(response.getAllocatedContainers());
      expectedNMTokens.addAll(response.getNMTokens());
      if (containers.size() == NUM_CONTAINERS) {
        break;
      }
      Thread.sleep(200);
      System.out.println("Waiting for container to be allocated.");
    }
    NodeId nodeId = expectedNMTokens.get(0).getNodeId();
    // NMToken is sent for the allocated container.
    Assert.assertEquals(nm1.getNodeId(), nodeId);
  }

  @Test (timeout = 40000)
  public void testNMToken() throws Exception {
    MockRM rm = new MockRM(conf);
    try {
      rm.start();
      MockNM nm1 = rm.registerNode("h1:1234", 10000);
      
      NMTokenSecretManagerInRM nmTokenSecretManager =
          rm.getRMContext().getNMTokenSecretManager();
      
      // submitting new application
      RMApp app = rm.submitApp(1000);
      
      // start scheduling.
      nm1.nodeHeartbeat(true);
      
      // Starting application attempt and launching
      // It should get registered with NMTokenSecretManager.
      RMAppAttempt attempt = app.getCurrentAppAttempt();

      MockAM am = rm.sendAMLaunched(attempt.getAppAttemptId());

      Assert.assertTrue(nmTokenSecretManager
          .isApplicationAttemptRegistered(attempt.getAppAttemptId()));
      
      // This will register application master.
      am.registerAppAttempt();
      
      ArrayList<Container> containersReceivedForNM1 =
          new ArrayList<Container>();
      List<ContainerId> releaseContainerList =
          new ArrayList<ContainerId>();
      HashMap<String, Token> nmTokens = new HashMap<String, Token>();

      // initially requesting 2 containers.
      AllocateResponse response =
          am.allocate("h1", 1000, 2, releaseContainerList);
      Assert.assertEquals(0, response.getAllocatedContainers().size());
      allocateContainersAndValidateNMTokens(am, containersReceivedForNM1, 2,
          nmTokens, nm1);
      Assert.assertEquals(1, nmTokens.size());

      
      // requesting 2 more containers.
      response = am.allocate("h1", 1000, 2, releaseContainerList);
      Assert.assertEquals(0, response.getAllocatedContainers().size());
      allocateContainersAndValidateNMTokens(am, containersReceivedForNM1, 4,
          nmTokens, nm1);
      Assert.assertEquals(1, nmTokens.size());
      
      
      // We will be simulating NM restart so restarting newly added h2:1234
      // NM 2 now registers.
      MockNM nm2 = rm.registerNode("h2:1234", 10000);
      nm2.nodeHeartbeat(true);
      ArrayList<Container> containersReceivedForNM2 =
          new ArrayList<Container>();
      
      response = am.allocate("h2", 1000, 2, releaseContainerList);
      Assert.assertEquals(0, response.getAllocatedContainers().size());
      allocateContainersAndValidateNMTokens(am, containersReceivedForNM2, 2,
          nmTokens, nm2);
      Assert.assertEquals(2, nmTokens.size());
      
      // Simulating NM-2 restart.
      nm2 = rm.registerNode("h2:1234", 10000);
      // Wait for reconnect to make it through the RM and create a new RMNode
      Map<NodeId, RMNode> nodes = rm.getRMContext().getRMNodes();
      while (nodes.get(nm2.getNodeId()).getLastNodeHeartBeatResponse()
          .getResponseId() > 0) {
        Thread.sleep(WAIT_SLEEP_MS);
      }

      int interval = 40;
      // Wait for nm Token to be cleared.
      while (nmTokenSecretManager
          .isApplicationAttemptNMTokenPresent(attempt.getAppAttemptId(),
              nm2.getNodeId()) && interval-- > 0) {
        LOG.info("waiting for nmToken to be cleared for : " + nm2.getNodeId());
        Thread.sleep(WAIT_SLEEP_MS);
      }
      Assert.assertTrue(nmTokenSecretManager
          .isApplicationAttemptRegistered(attempt.getAppAttemptId()));
      
      // removing NMToken for h2:1234
      nmTokens.remove(nm2.getNodeId().toString());
      Assert.assertEquals(1, nmTokens.size());
      
      // We should again receive the NMToken.
      response = am.allocate("h2", 1000, 2, releaseContainerList);
      Assert.assertEquals(0, response.getAllocatedContainers().size());
      allocateContainersAndValidateNMTokens(am, containersReceivedForNM2, 4,
          nmTokens, nm2);
      Assert.assertEquals(2, nmTokens.size());

      // Now rolling over NMToken masterKey. it should resend the NMToken in
      // next allocate call.
      Assert.assertTrue(nmTokenSecretManager
          .isApplicationAttemptNMTokenPresent(attempt.getAppAttemptId(),
              nm1.getNodeId()));
      Assert.assertTrue(nmTokenSecretManager
          .isApplicationAttemptNMTokenPresent(attempt.getAppAttemptId(),
              nm2.getNodeId()));
      
      nmTokenSecretManager.rollMasterKey();
      nmTokenSecretManager.activateNextMasterKey();
      
      Assert.assertFalse(nmTokenSecretManager
          .isApplicationAttemptNMTokenPresent(attempt.getAppAttemptId(),
              nm1.getNodeId()));
      Assert.assertFalse(nmTokenSecretManager
          .isApplicationAttemptNMTokenPresent(attempt.getAppAttemptId(),
              nm2.getNodeId()));
      // It should not remove application attempt entry.
      Assert.assertTrue(nmTokenSecretManager
          .isApplicationAttemptRegistered(attempt.getAppAttemptId()));

      nmTokens.clear();
      Assert.assertEquals(0, nmTokens.size());
      // We should again receive the NMToken.
      response = am.allocate("h2", 1000, 1, releaseContainerList);
      Assert.assertEquals(0, response.getAllocatedContainers().size());
      allocateContainersAndValidateNMTokens(am, containersReceivedForNM2, 5,
          nmTokens, nm2);
      Assert.assertEquals(1, nmTokens.size());
      Assert.assertTrue(nmTokenSecretManager
          .isApplicationAttemptNMTokenPresent(attempt.getAppAttemptId(),
              nm2.getNodeId()));
      
      
      // After AM is finished making sure that nmtoken entry for app
      Assert.assertTrue(nmTokenSecretManager
          .isApplicationAttemptRegistered(attempt.getAppAttemptId()));
      am.unregisterAppAttempt();
      // marking all the containers as finished.
      for (Container container : containersReceivedForNM1) {
        nm1.nodeHeartbeat(attempt.getAppAttemptId(),
            container.getId().getContainerId(),
            ContainerState.COMPLETE);
      }
      for (Container container : containersReceivedForNM2) {
        nm2.nodeHeartbeat(attempt.getAppAttemptId(),
            container.getId().getContainerId(),
            ContainerState.COMPLETE);
      }
      nm1.nodeHeartbeat(am.getApplicationAttemptId(), 1,
        ContainerState.COMPLETE);
      am.waitForState(RMAppAttemptState.FINISHED);
      Assert.assertFalse(nmTokenSecretManager
          .isApplicationAttemptRegistered(attempt.getAppAttemptId()));
    } finally {
      rm.stop();
    }
  }

  protected void allocateContainersAndValidateNMTokens(MockAM am,
      ArrayList<Container> containersReceived, int totalContainerRequested,
      HashMap<String, Token> nmTokens, MockNM nm) throws Exception,
      InterruptedException {
    ArrayList<ContainerId> releaseContainerList = new ArrayList<ContainerId>();
    AllocateResponse response;
    ArrayList<ResourceRequest> resourceRequest =
        new ArrayList<ResourceRequest>();      
    while (containersReceived.size() < totalContainerRequested) {
      nm.nodeHeartbeat(true);
      LOG.info("requesting containers..");
      response =
          am.allocate(resourceRequest, releaseContainerList);
      containersReceived.addAll(response.getAllocatedContainers());
      if (!response.getNMTokens().isEmpty()) {
        for (NMToken nmToken : response.getNMTokens()) {
          String nodeId = nmToken.getNodeId().toString();
          if (nmTokens.containsKey(nodeId)) {
            Assert.fail("Duplicate NMToken received for : " + nodeId);
          }
          nmTokens.put(nodeId, nmToken.getToken());
        }
      }
      LOG.info("Got " + containersReceived.size()
          + " containers. Waiting to get " + totalContainerRequested);
      Thread.sleep(WAIT_SLEEP_MS);
    }
  }

  @Test (timeout = 300000)
  public void testActivatingApplicationAfterAddingNM() throws Exception {
    MockRM rm1 = new MockRM(conf);

    // start like normal because state is empty
    rm1.start();

    // app that gets launched
    RMApp app1 = rm1.submitApp(200);

    // app that does not get launched
    RMApp app2 = rm1.submitApp(200);

    // app1 and app2 should be scheduled, but because no resource is available,
    // they are not activated.
    RMAppAttempt attempt1 = app1.getCurrentAppAttempt();
    ApplicationAttemptId attemptId1 = attempt1.getAppAttemptId();
    rm1.waitForState(attemptId1, RMAppAttemptState.SCHEDULED);
    RMAppAttempt attempt2 = app2.getCurrentAppAttempt();
    ApplicationAttemptId attemptId2 = attempt2.getAppAttemptId();
    rm1.waitForState(attemptId2, RMAppAttemptState.SCHEDULED);

    MockNM nm1 = new MockNM("h1:1234", 15120, rm1.getResourceTrackerService());
    MockNM nm2 = new MockNM("h2:5678", 15120, rm1.getResourceTrackerService());
    nm1.registerNode();
    nm2.registerNode();

    //kick the scheduling
    nm1.nodeHeartbeat(true);

    // app1 should be allocated now
    rm1.waitForState(attemptId1, RMAppAttemptState.ALLOCATED);
    rm1.waitForState(attemptId2, RMAppAttemptState.SCHEDULED);

    nm2.nodeHeartbeat(true);

    // app2 should be allocated now
    rm1.waitForState(attemptId1, RMAppAttemptState.ALLOCATED);
    rm1.waitForState(attemptId2, RMAppAttemptState.ALLOCATED);

    rm1.stop();
  }

  // This is to test AM Host and rpc port are invalidated after the am attempt
  // is killed or failed, so that client doesn't get the wrong information.
  @Test (timeout = 80000)
  public void testInvalidateAMHostPortWhenAMFailedOrKilled() throws Exception {
    conf.setInt(YarnConfiguration.RM_AM_MAX_ATTEMPTS, 1);
    MockRM rm1 = new MockRM(conf);
    rm1.start();

    // a succeeded app
    RMApp app1 = rm1.submitApp(200);
    MockNM nm1 =
        new MockNM("127.0.0.1:1234", 15120, rm1.getResourceTrackerService());
    nm1.registerNode();
    MockAM am1 = MockRM.launchAndRegisterAM(app1, rm1, nm1);
    MockRM.finishAMAndVerifyAppState(app1, rm1, nm1, am1);

    // a failed app
    RMApp app2 = rm1.submitApp(200);
    MockAM am2 = MockRM.launchAndRegisterAM(app2, rm1, nm1);
    nm1.nodeHeartbeat(am2.getApplicationAttemptId(), 1, ContainerState.COMPLETE);
    am2.waitForState(RMAppAttemptState.FAILED);
    rm1.waitForState(app2.getApplicationId(), RMAppState.FAILED);

    // a killed app
    RMApp app3 = rm1.submitApp(200);
    MockAM am3 = MockRM.launchAndRegisterAM(app3, rm1, nm1);
    rm1.killApp(app3.getApplicationId());
    rm1.waitForState(app3.getApplicationId(), RMAppState.KILLED);
    rm1.waitForState(am3.getApplicationAttemptId(), RMAppAttemptState.KILLED);

    GetApplicationsRequest request1 =
        GetApplicationsRequest.newInstance(EnumSet.of(
          YarnApplicationState.FINISHED, YarnApplicationState.KILLED,
          YarnApplicationState.FAILED));
    GetApplicationsResponse response1 =
        rm1.getClientRMService().getApplications(request1);
    List<ApplicationReport> appList1 = response1.getApplicationList();

    Assert.assertEquals(3, appList1.size());
    for (ApplicationReport report : appList1) {
      // killed/failed apps host and rpc port are invalidated.
      if (report.getApplicationId().equals(app2.getApplicationId())
          || report.getApplicationId().equals(app3.getApplicationId())) {
        Assert.assertEquals("N/A", report.getHost());
        Assert.assertEquals(-1, report.getRpcPort());
      }
      // succeeded app's host and rpc port is not invalidated
      if (report.getApplicationId().equals(app1.getApplicationId())) {
        Assert.assertFalse(report.getHost().equals("N/A"));
        Assert.assertTrue(report.getRpcPort() != -1);
      }
    }
  }

  @Test (timeout = 60000)
  public void testInvalidatedAMHostPortOnAMRestart() throws Exception {
    MockRM rm1 = new MockRM(conf);
    rm1.start();
    MockNM nm1 =
        new MockNM("127.0.0.1:1234", 15120, rm1.getResourceTrackerService());
    nm1.registerNode();

    // a failed app
    RMApp app2 = rm1.submitApp(200);
    MockAM am2 = MockRM.launchAndRegisterAM(app2, rm1, nm1);
    nm1
      .nodeHeartbeat(am2.getApplicationAttemptId(), 1, ContainerState.COMPLETE);
    am2.waitForState(RMAppAttemptState.FAILED);
    rm1.waitForState(app2.getApplicationId(), RMAppState.ACCEPTED);

    // before new attempt is launched, the app report returns the invalid AM
    // host and port.
    GetApplicationReportRequest request1 =
        GetApplicationReportRequest.newInstance(app2.getApplicationId());
    ApplicationReport report1 =
        rm1.getClientRMService().getApplicationReport(request1)
          .getApplicationReport();
    Assert.assertEquals("N/A", report1.getHost());
    Assert.assertEquals(-1, report1.getRpcPort());
  }

  /**
   * Validate killing an application when it is at accepted state.
   * @throws Exception exception
   */
  @Test (timeout = 60000)
  public void testApplicationKillAtAcceptedState() throws Exception {

    final Dispatcher dispatcher = new AsyncDispatcher() {
      @Override
      public EventHandler getEventHandler() {

        class EventArgMatcher extends ArgumentMatcher<AbstractEvent> {
          @Override
          public boolean matches(Object argument) {
            if (argument instanceof RMAppAttemptEvent) {
              if (((RMAppAttemptEvent) argument).getType().equals(
                RMAppAttemptEventType.KILL)) {
                return true;
              }
            }
            return false;
          }
        }

        EventHandler handler = spy(super.getEventHandler());
        doNothing().when(handler).handle(argThat(new EventArgMatcher()));
        return handler;
      }
    };

    MockRM rm = new MockRM(conf) {
      @Override
      protected Dispatcher createDispatcher() {
        return dispatcher;
      }
    };

    // test metrics
    QueueMetrics metrics = rm.getResourceScheduler().getRootQueueMetrics();
    int appsKilled = metrics.getAppsKilled();
    int appsSubmitted = metrics.getAppsSubmitted();

    rm.start();
    
    MockNM nm1 =
        new MockNM("127.0.0.1:1234", 15120, rm.getResourceTrackerService());
    nm1.registerNode();

    // a failed app
    RMApp application = rm.submitApp(200);
    MockAM am = MockRM.launchAM(application, rm, nm1);
    am.waitForState(RMAppAttemptState.LAUNCHED);
    nm1.nodeHeartbeat(am.getApplicationAttemptId(), 1, ContainerState.RUNNING);
    rm.waitForState(application.getApplicationId(), RMAppState.ACCEPTED);

    // Now kill the application before new attempt is launched, the app report
    // returns the invalid AM host and port.
    KillApplicationRequest request =
        KillApplicationRequest.newInstance(application.getApplicationId());
    rm.getClientRMService().forceKillApplication(request);

    // Specific test for YARN-1689 follows
    // Now let's say a race causes AM to register now. This should not crash RM.
    am.registerAppAttempt(false);

    // We explicitly intercepted the kill-event to RMAppAttempt, so app should
    // still be in KILLING state.
    rm.waitForState(application.getApplicationId(), RMAppState.KILLING);
    // AM should now be in running
    rm.waitForState(am.getApplicationAttemptId(), RMAppAttemptState.RUNNING);

    // Simulate that appAttempt is killed.
    rm.getRMContext().getDispatcher().getEventHandler().handle(
        new RMAppEvent(application.getApplicationId(),
          RMAppEventType.ATTEMPT_KILLED));
    rm.waitForState(application.getApplicationId(), RMAppState.KILLED);

    // test metrics
    metrics = rm.getResourceScheduler().getRootQueueMetrics();
    Assert.assertEquals(appsKilled + 1, metrics.getAppsKilled());
    Assert.assertEquals(appsSubmitted + 1, metrics.getAppsSubmitted());
  }

  // Test Kill an app while the app is finishing in the meanwhile.
  @Test (timeout = 30000)
  public void testKillFinishingApp() throws Exception{

    // this dispatcher ignores RMAppAttemptEventType.KILL event
    final Dispatcher dispatcher = new AsyncDispatcher() {
      @Override
      public EventHandler getEventHandler() {

        class EventArgMatcher extends ArgumentMatcher<AbstractEvent> {
          @Override
          public boolean matches(Object argument) {
            if (argument instanceof RMAppAttemptEvent) {
              if (((RMAppAttemptEvent) argument).getType().equals(
                RMAppAttemptEventType.KILL)) {
                return true;
              }
            }
            return false;
          }
        }

        EventHandler handler = spy(super.getEventHandler());
        doNothing().when(handler).handle(argThat(new EventArgMatcher()));
        return handler;
      }
    };

    MockRM rm1 = new MockRM(conf){
      @Override
      protected Dispatcher createDispatcher() {
        return dispatcher;
      }
    };
    rm1.start();
    MockNM nm1 =
        new MockNM("127.0.0.1:1234", 8192, rm1.getResourceTrackerService());
    nm1.registerNode();
    RMApp app1 = rm1.submitApp(200);
    MockAM am1 = MockRM.launchAndRegisterAM(app1, rm1, nm1);

    rm1.killApp(app1.getApplicationId());

    FinishApplicationMasterRequest req =
        FinishApplicationMasterRequest.newInstance(
          FinalApplicationStatus.SUCCEEDED, "", "");
    am1.unregisterAppAttempt(req,true);

    rm1.waitForState(am1.getApplicationAttemptId(), RMAppAttemptState.FINISHING);
    nm1.nodeHeartbeat(am1.getApplicationAttemptId(), 1, ContainerState.COMPLETE);
    rm1.waitForState(am1.getApplicationAttemptId(), RMAppAttemptState.FINISHED);
    rm1.waitForState(app1.getApplicationId(), RMAppState.FINISHED);
  }

  // Test Kill an app while the app is failing
  @Test (timeout = 30000)
  public void testKillFailingApp() throws Exception{

    // this dispatcher ignores RMAppAttemptEventType.KILL event
    final Dispatcher dispatcher = new AsyncDispatcher() {
      @Override
      public EventHandler getEventHandler() {

        class EventArgMatcher extends ArgumentMatcher<AbstractEvent> {
          @Override
          public boolean matches(Object argument) {
            if (argument instanceof RMAppAttemptEvent) {
              if (((RMAppAttemptEvent) argument).getType().equals(
                RMAppAttemptEventType.KILL)) {
                return true;
              }
            }
            return false;
          }
        }

        EventHandler handler = spy(super.getEventHandler());
        doNothing().when(handler).handle(argThat(new EventArgMatcher()));
        return handler;
      }
    };

    MockRM rm1 = new MockRM(conf){
      @Override
      protected Dispatcher createDispatcher() {
        return dispatcher;
      }
    };
    rm1.start();
    MockNM nm1 =
        new MockNM("127.0.0.1:1234", 8192, rm1.getResourceTrackerService());
    nm1.registerNode();
    RMApp app1 = rm1.submitApp(200);
    MockAM am1 = MockRM.launchAndRegisterAM(app1, rm1, nm1);

    rm1.killApp(app1.getApplicationId());

    // fail the app by sending container_finished event.
    nm1.nodeHeartbeat(am1.getApplicationAttemptId(), 1, ContainerState.COMPLETE);
    rm1.waitForState(am1.getApplicationAttemptId(), RMAppAttemptState.FAILED);
    // app is killed, not launching a new attempt
    rm1.waitForState(app1.getApplicationId(), RMAppState.KILLED);
  }
}
