diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 2ab883d5ce7..3ef3b570cca 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -231,6 +231,9 @@ Release 2.4.0 - UNRELEASED
     YARN-1704. Modified LICENSE and NOTICE files to reflect newly used levelDB
     related libraries. (Billie Rinaldi via vinodkv)
 
+    YARN-1765. Added test cases to verify that killApplication API works across
+    ResourceManager failover. (Xuan Gong via vinodkv) 
+
   OPTIMIZATIONS
 
   BUG FIXES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestKillApplicationWithRMHA.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestKillApplicationWithRMHA.java
new file mode 100644
index 00000000000..918de801581
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestKillApplicationWithRMHA.java
@@ -0,0 +1,416 @@
+/*
+ * 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 static org.junit.Assert.fail;
+
+import java.io.IOException;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.ha.ClientBaseWithFixes;
+import org.apache.hadoop.ha.HAServiceProtocol;
+import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
+import org.apache.hadoop.ha.HAServiceProtocol.StateChangeRequestInfo;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationRequest;
+import org.apache.hadoop.yarn.api.protocolrecords.KillApplicationResponse;
+import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
+import org.apache.hadoop.yarn.api.records.ApplicationId;
+import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
+import org.apache.hadoop.yarn.conf.HAUtil;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.exceptions.ApplicationNotFoundException;
+import org.apache.hadoop.yarn.exceptions.YarnException;
+import org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore;
+import org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.RMState;
+import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
+import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl;
+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.RMAppAttemptState;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.YarnScheduler;
+import org.apache.hadoop.yarn.server.resourcemanager.security.QueueACLsManager;
+import org.apache.hadoop.yarn.server.resourcemanager.security.RMDelegationTokenSecretManager;
+import org.apache.hadoop.yarn.server.security.ApplicationACLsManager;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+
+public class TestKillApplicationWithRMHA extends ClientBaseWithFixes{
+
+  public static final Log LOG = LogFactory
+      .getLog(TestKillApplicationWithRMHA.class);
+  private static final int ZK_TIMEOUT_MS = 5000;
+  private static StateChangeRequestInfo requestInfo =
+      new StateChangeRequestInfo(
+          HAServiceProtocol.RequestSource.REQUEST_BY_USER);
+  private Configuration configuration = new YarnConfiguration();
+  static MockRM rm1 = null;
+  static MockRM rm2 = null;
+  Configuration confForRM1;
+  Configuration confForRM2;
+
+  @Before
+  public void setup() throws Exception {
+    configuration.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+    configuration.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2");
+    configuration.setBoolean(YarnConfiguration.RECOVERY_ENABLED, true);
+    configuration.set(YarnConfiguration.RM_STORE,
+        ZKRMStateStore.class.getName());
+    configuration.set(YarnConfiguration.RM_ZK_ADDRESS, hostPort);
+    configuration.setInt(YarnConfiguration.RM_ZK_TIMEOUT_MS, ZK_TIMEOUT_MS);
+    configuration.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
+    configuration.set(YarnConfiguration.RM_CLUSTER_ID, "test-yarn-cluster");
+    int base = 100;
+    for (String confKey : YarnConfiguration
+        .getServiceAddressConfKeys(configuration)) {
+      configuration.set(HAUtil.addSuffix(confKey, "rm1"), "0.0.0.0:"
+          + (base + 20));
+      configuration.set(HAUtil.addSuffix(confKey, "rm2"), "0.0.0.0:"
+          + (base + 40));
+      base = base * 2;
+    }
+    confForRM1 = new Configuration(configuration);
+    confForRM1.set(YarnConfiguration.RM_HA_ID, "rm1");
+    confForRM2 = new Configuration(configuration);
+    confForRM2.set(YarnConfiguration.RM_HA_ID, "rm2");
+  }
+
+  @After
+  public void teardown() {
+    if (rm1 != null) {
+      rm1.stop();
+    }
+    if (rm2 != null) {
+      rm2.stop();
+    }
+  }
+
+  @Test (timeout = 20000)
+  public void testKillAppWhenFailoverHappensAtNewState()
+      throws Exception {
+    // create a customized RMAppManager
+    // During the process of Application submission,
+    // the RMAppState will always be NEW.
+    // The ApplicationState will not be saved in RMStateStore.
+    startRMsWithCustomizedRMAppManager();
+    MockNM nm1 =
+        new MockNM("127.0.0.1:1234", 15120, rm1.getResourceTrackerService());
+    nm1.registerNode();
+
+    // Submit the application
+    RMApp app0 =
+        rm1.submitApp(200, "", UserGroupInformation
+            .getCurrentUser().getShortUserName(), null, false, null,
+            configuration.getInt(YarnConfiguration.RM_AM_MAX_ATTEMPTS,
+                YarnConfiguration.DEFAULT_RM_AM_MAX_ATTEMPTS), null, null,
+            false, false);
+
+    // failover and kill application
+    // When FailOver happens, the state of this application is NEW,
+    // and ApplicationState is not saved in RMStateStore. The active RM
+    // can not load the ApplicationState of this application.
+    // Expected to get ApplicationNotFoundException
+    // when receives the KillApplicationRequest
+    try {
+      failOverAndKillApp(app0.getApplicationId(), RMAppState.NEW);
+      fail("Should get an exception here");
+    } catch (ApplicationNotFoundException ex) {
+      Assert.assertTrue(ex.getMessage().contains(
+          "Trying to kill an absent application " + app0.getApplicationId()));
+    }
+  }
+
+  @Test (timeout = 20000)
+  public void testKillAppWhenFailoverHappensAtRunningState()
+      throws Exception {
+    startRMs();
+    MockNM nm1 = new MockNM("127.0.0.1:1234", 15120,
+        rm1.getResourceTrackerService());
+    nm1.registerNode();
+
+    // create app and launch the AM
+    RMApp app0 = rm1.submitApp(200);
+    MockAM am0 = launchAM(app0, rm1, nm1);
+
+    // failover and kill application
+    // The application is at RUNNING State when failOver happens.
+    // Since RMStateStore has already saved ApplicationState, the active RM
+    // will load the ApplicationState. After that, the application will be at
+    // ACCEPTED State. Because the application is not at Final State,
+    // KillApplicationResponse.getIsKillCompleted is expected to return false.
+    failOverAndKillApp(app0.getApplicationId(),
+        am0.getApplicationAttemptId(), RMAppState.RUNNING,
+        RMAppAttemptState.RUNNING, RMAppState.ACCEPTED);
+  }
+
+  @Test (timeout = 20000)
+  public void testKillAppWhenFailoverHappensAtFinalState()
+      throws Exception {
+    startRMs();
+    MockNM nm1 = new MockNM("127.0.0.1:1234", 15120,
+        rm1.getResourceTrackerService());
+    nm1.registerNode();
+
+    // create app and launch the AM
+    RMApp app0 = rm1.submitApp(200);
+    MockAM am0 = launchAM(app0, rm1, nm1);
+
+    // kill the app.
+    rm1.killApp(app0.getApplicationId());
+    rm1.waitForState(app0.getApplicationId(), RMAppState.KILLED);
+    rm1.waitForState(am0.getApplicationAttemptId(), RMAppAttemptState.KILLED);
+
+    // failover and kill application
+    // The application is at Killed State and RMStateStore has already
+    // saved this applicationState. After failover happens, the current
+    // active RM will load the ApplicationState whose RMAppState is killed.
+    // Because this application is at Final State,
+    // KillApplicationResponse.getIsKillCompleted is expected to return true.
+    failOverAndKillApp(app0.getApplicationId(),
+        am0.getApplicationAttemptId(), RMAppState.KILLED,
+        RMAppAttemptState.KILLED, RMAppState.KILLED);
+  }
+
+  @Test (timeout = 20000)
+  public void testKillAppWhenFailOverHappensDuringApplicationKill()
+      throws Exception {
+    // create a customized ClientRMService
+    // When receives the killApplicationRequest, simply return the response
+    // and make sure the application will not be KILLED State
+    startRMsWithCustomizedClientRMService();
+    MockNM nm1 = new MockNM("127.0.0.1:1234", 15120,
+        rm1.getResourceTrackerService());
+    nm1.registerNode();
+
+    // create app and launch the AM
+    RMApp app0 = rm1.submitApp(200);
+    MockAM am0 = launchAM(app0, rm1, nm1);
+
+    // ensure that the app is in running state
+    Assert.assertEquals(app0.getState(), RMAppState.RUNNING);
+
+    // kill the app.
+    rm1.killApp(app0.getApplicationId());
+
+    // failover happens before this application goes to final state.
+    // The RMAppState that will be loaded by the active rm
+    // should be ACCEPTED.
+    failOverAndKillApp(app0.getApplicationId(),
+        am0.getApplicationAttemptId(), RMAppState.RUNNING,
+        RMAppAttemptState.RUNNING, RMAppState.ACCEPTED);
+
+  }
+
+  private MockAM launchAM(RMApp app, MockRM rm, MockNM nm)
+      throws Exception {
+    RMAppAttempt attempt = app.getCurrentAppAttempt();
+    nm.nodeHeartbeat(true);
+    MockAM am = rm.sendAMLaunched(attempt.getAppAttemptId());
+    am.registerAppAttempt();
+    rm.waitForState(app.getApplicationId(), RMAppState.RUNNING);
+    rm.waitForState(app.getCurrentAppAttempt().getAppAttemptId(),
+        RMAppAttemptState.RUNNING);
+    return am;
+  }
+
+  private void failOverAndKillApp(ApplicationId appId,
+      ApplicationAttemptId appAttemptId, RMAppState initialRMAppState,
+      RMAppAttemptState initialRMAppAttemptState,
+      RMAppState expectedAppStateBeforeKillApp) throws Exception {
+    Assert.assertEquals(initialRMAppState,
+        rm1.getRMContext().getRMApps().get(appId).getState());
+    Assert.assertEquals(initialRMAppAttemptState, rm1.getRMContext()
+        .getRMApps().get(appId).getAppAttempts().get(appAttemptId).getState());
+    explicitFailover();
+    Assert.assertEquals(expectedAppStateBeforeKillApp,
+        rm2.getRMContext().getRMApps().get(appId).getState());
+    killApplication(rm2, appId, appAttemptId, initialRMAppState);
+  }
+
+  private void failOverAndKillApp(ApplicationId appId,
+      RMAppState initialRMAppState) throws Exception {
+    Assert.assertEquals(initialRMAppState,
+        rm1.getRMContext().getRMApps().get(appId).getState());
+    explicitFailover();
+    Assert.assertTrue(rm2.getRMContext().getRMApps().get(appId) == null);
+    killApplication(rm2, appId, null, initialRMAppState);
+  }
+
+  private void startRMs() throws IOException {
+    rm1 = new MockRM(confForRM1);
+    rm2 = new MockRM(confForRM2);
+    startRMs(rm1, confForRM1, rm2, confForRM2);
+
+  }
+
+  private void startRMsWithCustomizedRMAppManager() throws IOException {
+    final Configuration conf1 = new Configuration(confForRM1);
+
+    rm1 = new MockRM(conf1) {
+      @Override
+      protected RMAppManager createRMAppManager() {
+        return new MyRMAppManager(this.rmContext, this.scheduler,
+            this.masterService, this.applicationACLsManager, conf1);
+      }
+    };
+
+    rm2 = new MockRM(confForRM2);
+
+    startRMs(rm1, conf1, rm2, confForRM2);
+  }
+
+  private void startRMsWithCustomizedClientRMService() throws IOException {
+    final Configuration conf1 = new Configuration(confForRM1);
+
+    rm1 = new MockRM(conf1) {
+      @Override
+      protected ClientRMService createClientRMService() {
+        return new MyClientRMService(this.rmContext, this.scheduler,
+            this.rmAppManager, this.applicationACLsManager,
+            this.queueACLsManager, getRMDTSecretManager());
+      }
+    };
+
+    rm2 = new MockRM(confForRM2);
+
+    startRMs(rm1, conf1, rm2, confForRM2);
+  }
+
+  private static class MyRMAppManager extends RMAppManager {
+
+    private Configuration conf;
+    private RMContext rmContext;
+
+    public MyRMAppManager(RMContext context, YarnScheduler scheduler,
+        ApplicationMasterService masterService,
+        ApplicationACLsManager applicationACLsManager, Configuration conf) {
+      super(context, scheduler, masterService, applicationACLsManager, conf);
+      this.conf = conf;
+      this.rmContext = context;
+    }
+
+    @Override
+    protected void submitApplication(
+        ApplicationSubmissionContext submissionContext, long submitTime,
+        String user, boolean isRecovered, RMState state) throws YarnException {
+      //Do nothing, just add the application to RMContext
+      RMAppImpl application =
+          new RMAppImpl(submissionContext.getApplicationId(), this.rmContext,
+              this.conf, submissionContext.getApplicationName(), user,
+              submissionContext.getQueue(), submissionContext,
+              this.rmContext.getScheduler(),
+              this.rmContext.getApplicationMasterService(),
+              submitTime, submissionContext.getApplicationType(),
+              submissionContext.getApplicationTags());
+      this.rmContext.getRMApps().put(submissionContext.getApplicationId(),
+          application);
+      //Do not send RMAppEventType.START event
+      //so the state of Application will not reach to NEW_SAVING state.
+    }
+  }
+
+  private static class MyClientRMService extends ClientRMService {
+
+    private RMContext rmContext;
+
+    public MyClientRMService(RMContext rmContext, YarnScheduler scheduler,
+        RMAppManager rmAppManager,
+        ApplicationACLsManager applicationACLsManager,
+        QueueACLsManager queueACLsManager,
+        RMDelegationTokenSecretManager rmDTSecretManager) {
+      super(rmContext, scheduler, rmAppManager, applicationACLsManager,
+          queueACLsManager, rmDTSecretManager);
+      this.rmContext = rmContext;
+    }
+
+    @Override
+    protected void serviceStart() {
+      // override to not start rpc handler
+    }
+
+    @Override
+    protected void serviceStop() {
+      // don't do anything
+    }
+
+    @Override
+    public KillApplicationResponse forceKillApplication(
+        KillApplicationRequest request) throws YarnException {
+      ApplicationId applicationId = request.getApplicationId();
+      RMApp application = this.rmContext.getRMApps().get(applicationId);
+      if (application.isAppSafeToTerminate()) {
+        return KillApplicationResponse.newInstance(true);
+      } else {
+        return KillApplicationResponse.newInstance(false);
+      }
+    }
+  }
+
+  private boolean isFinalState(RMAppState state) {
+    return state.equals(RMAppState.FINISHING)
+    || state.equals(RMAppState.FINISHED) || state.equals(RMAppState.FAILED)
+    || state.equals(RMAppState.KILLED);
+  }
+
+  private void explicitFailover() throws IOException {
+    rm1.adminService.transitionToStandby(requestInfo);
+    rm2.adminService.transitionToActive(requestInfo);
+    Assert.assertTrue(rm1.getRMContext().getHAServiceState()
+        == HAServiceState.STANDBY);
+    Assert.assertTrue(rm2.getRMContext().getHAServiceState()
+        == HAServiceState.ACTIVE);
+  }
+
+  private void killApplication(MockRM rm, ApplicationId appId,
+      ApplicationAttemptId appAttemptId, RMAppState rmAppState)
+      throws Exception {
+    KillApplicationResponse response = rm.killApp(appId);
+    Assert
+        .assertTrue(response.getIsKillCompleted() == isFinalState(rmAppState));
+    RMApp loadedApp0 =
+        rm.getRMContext().getRMApps().get(appId);
+    rm.waitForState(appId, RMAppState.KILLED);
+    if (appAttemptId != null) {
+      rm.waitForState(appAttemptId, RMAppAttemptState.KILLED);
+    }
+    // no new attempt is created.
+    Assert.assertEquals(1, loadedApp0.getAppAttempts().size());
+  }
+
+  private void startRMs(MockRM rm1, Configuration confForRM1, MockRM rm2,
+      Configuration confForRM2) throws IOException {
+    rm1.init(confForRM1);
+    rm1.start();
+    Assert.assertTrue(rm1.getRMContext().getHAServiceState()
+        == HAServiceState.STANDBY);
+
+    rm2.init(confForRM2);
+    rm2.start();
+    Assert.assertTrue(rm2.getRMContext().getHAServiceState()
+        == HAServiceState.STANDBY);
+
+    rm1.adminService.transitionToActive(requestInfo);
+    Assert.assertTrue(rm1.getRMContext().getHAServiceState()
+        == HAServiceState.ACTIVE);
+  }
+}