YARN-5519. Add SubClusterId in AddApplicationHomeSubClusterResponse for Router Failover. (Ellen Hui via Subru)

(cherry picked from commit e4f928cf9cb2a0d57131e4b7960f47a8dac7940c)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/FederationApplicationHomeSubClusterStore.java

@@ -51,15 +51,20 @@ public interface FederationApplicationHomeSubClusterStore {
   /**
    * Register the home {@code SubClusterId} of the newly submitted
    * {@code ApplicationId}. Currently response is empty if the operation was
-   * successful, if not an exception reporting reason for a failure.
+   * successful, if not an exception reporting reason for a failure. If a
+   * mapping for the application already existed, the {@code SubClusterId} in
+   * this response will return the existing mapping which might be different
+   * from that in the {@code AddApplicationHomeSubClusterRequest}.
    *
    * @param request the request to register a new application with its home
    *          sub-cluster
-   * @return empty on successful registration of the application in the
+   * @return upon successful registration of the application in the StateStore,
-   *         StateStore, if not an exception reporting reason for a failure
+   *         {@code AddApplicationHomeSubClusterRequest} containing the home
+   *         sub-cluster of the application. Otherwise, an exception reporting
+   *         reason for a failure
    * @throws YarnException if the request is invalid/fails
    */
-  AddApplicationHomeSubClusterResponse addApplicationHomeSubClusterMap(
+  AddApplicationHomeSubClusterResponse addApplicationHomeSubCluster(
       AddApplicationHomeSubClusterRequest request) throws YarnException;
 
   /**
@@ -73,7 +78,7 @@ AddApplicationHomeSubClusterResponse addApplicationHomeSubClusterMap(
    *         not an exception reporting reason for a failure
    * @throws YarnException if the request is invalid/fails
    */
-  UpdateApplicationHomeSubClusterResponse updateApplicationHomeSubClusterMap(
+  UpdateApplicationHomeSubClusterResponse updateApplicationHomeSubCluster(
       UpdateApplicationHomeSubClusterRequest request) throws YarnException;
 
   /**
@@ -85,7 +90,7 @@ UpdateApplicationHomeSubClusterResponse updateApplicationHomeSubClusterMap(
    *         subcluster
    * @throws YarnException if the request is invalid/fails
    */
-  GetApplicationHomeSubClusterResponse getApplicationHomeSubClusterMap(
+  GetApplicationHomeSubClusterResponse getApplicationHomeSubCluster(
       GetApplicationHomeSubClusterRequest request) throws YarnException;
 
   /**
@@ -96,7 +101,7 @@ GetApplicationHomeSubClusterResponse getApplicationHomeSubClusterMap(
    * @return the mapping of all submitted application to it's home sub-cluster
    * @throws YarnException if the request is invalid/fails
    */
-  GetApplicationsHomeSubClusterResponse getApplicationsHomeSubClusterMap(
+  GetApplicationsHomeSubClusterResponse getApplicationsHomeSubCluster(
       GetApplicationsHomeSubClusterRequest request) throws YarnException;
 
   /**
@@ -110,7 +115,7 @@ GetApplicationsHomeSubClusterResponse getApplicationsHomeSubClusterMap(
    *         not an exception reporting reason for a failure
    * @throws YarnException if the request is invalid/fails
    */
-  DeleteApplicationHomeSubClusterResponse deleteApplicationHomeSubClusterMap(
+  DeleteApplicationHomeSubClusterResponse deleteApplicationHomeSubCluster(
       DeleteApplicationHomeSubClusterRequest request) throws YarnException;
 
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/MemoryFederationStateStore.java

@@ -89,7 +89,6 @@ public void close() {
   public SubClusterRegisterResponse registerSubCluster(
       SubClusterRegisterRequest request) throws YarnException {
     SubClusterInfo subClusterInfo = request.getSubClusterInfo();
-    subClusterInfo.setLastStartTime(clock.getTime());
     membership.put(subClusterInfo.getSubClusterId(), subClusterInfo);
     return SubClusterRegisterResponse.newInstance();
   }
@@ -156,21 +155,22 @@ public GetSubClustersInfoResponse getSubClusters(
   // FederationApplicationHomeSubClusterStore methods
 
   @Override
-  public AddApplicationHomeSubClusterResponse addApplicationHomeSubClusterMap(
+  public AddApplicationHomeSubClusterResponse addApplicationHomeSubCluster(
       AddApplicationHomeSubClusterRequest request) throws YarnException {
     ApplicationId appId =
         request.getApplicationHomeSubCluster().getApplicationId();
-    if (applications.containsKey(appId)) {
-      throw new YarnException("Application " + appId + " already exists");
-    }
 
+    if (!applications.containsKey(appId)) {
       applications.put(appId,
           request.getApplicationHomeSubCluster().getHomeSubCluster());
-    return AddApplicationHomeSubClusterResponse.newInstance();
+    }
+
+    return AddApplicationHomeSubClusterResponse
+        .newInstance(applications.get(appId));
   }
 
   @Override
-  public UpdateApplicationHomeSubClusterResponse updateApplicationHomeSubClusterMap(
+  public UpdateApplicationHomeSubClusterResponse updateApplicationHomeSubCluster(
       UpdateApplicationHomeSubClusterRequest request) throws YarnException {
     ApplicationId appId =
         request.getApplicationHomeSubCluster().getApplicationId();
@@ -184,7 +184,7 @@ public UpdateApplicationHomeSubClusterResponse updateApplicationHomeSubClusterMa
   }
 
   @Override
-  public GetApplicationHomeSubClusterResponse getApplicationHomeSubClusterMap(
+  public GetApplicationHomeSubClusterResponse getApplicationHomeSubCluster(
       GetApplicationHomeSubClusterRequest request) throws YarnException {
     ApplicationId appId = request.getApplicationId();
     if (!applications.containsKey(appId)) {
@@ -196,7 +196,7 @@ public GetApplicationHomeSubClusterResponse getApplicationHomeSubClusterMap(
   }
 
   @Override
-  public GetApplicationsHomeSubClusterResponse getApplicationsHomeSubClusterMap(
+  public GetApplicationsHomeSubClusterResponse getApplicationsHomeSubCluster(
       GetApplicationsHomeSubClusterRequest request) throws YarnException {
     List<ApplicationHomeSubCluster> result =
         new ArrayList<ApplicationHomeSubCluster>();
@@ -210,7 +210,7 @@ public GetApplicationsHomeSubClusterResponse getApplicationsHomeSubClusterMap(
   }
 
   @Override
-  public DeleteApplicationHomeSubClusterResponse deleteApplicationHomeSubClusterMap(
+  public DeleteApplicationHomeSubClusterResponse deleteApplicationHomeSubCluster(
       DeleteApplicationHomeSubClusterRequest request) throws YarnException {
     ApplicationId appId = request.getApplicationId();
     if (!applications.containsKey(appId)) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/records/AddApplicationHomeSubClusterResponse.java

@@ -24,10 +24,13 @@
 /**
  * AddApplicationHomeSubClusterResponse contains the answer from the
  * {@code FederationApplicationHomeSubClusterStore} to a request to insert a
- * newly generated applicationId and its owner. Currently response is empty if
+ * newly generated applicationId and its owner.
- * the operation was successful, if not an exception reporting reason for a
- * failure.
  *
+ * The response contains application's home sub-cluster as it is stored in the
+ * {@code FederationApplicationHomeSubClusterStore}. If a mapping for the
+ * application already existed, the {@code SubClusterId} in this response will
+ * return the existing mapping which might be different from that in the
+ * {@code AddApplicationHomeSubClusterRequest}.
  */
 @Private
 @Unstable
@@ -35,10 +38,28 @@ public abstract class AddApplicationHomeSubClusterResponse {
 
   @Private
   @Unstable
-  public static AddApplicationHomeSubClusterResponse newInstance() {
+  public static AddApplicationHomeSubClusterResponse newInstance(
+      SubClusterId homeSubCluster) {
     AddApplicationHomeSubClusterResponse response =
         Records.newRecord(AddApplicationHomeSubClusterResponse.class);
+    response.setHomeSubCluster(homeSubCluster);
     return response;
   }
 
+  /**
+   * Set the home sub-cluster that this application has been assigned to.
+   *
+   * @param homeSubCluster the {@link SubClusterId} of this application's home
+   *          sub-cluster
+   */
+  public abstract void setHomeSubCluster(SubClusterId homeSubCluster);
+
+  /**
+   * Get the home sub-cluster that this application has been assigned to. This
+   * may not match the {@link SubClusterId} in the corresponding response, if
+   * the mapping for the request's application already existed.
+   *
+   * @return the {@link SubClusterId} of this application's home sub-cluster
+   */
+  public abstract SubClusterId getHomeSubCluster();
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/records/impl/pb/AddApplicationHomeSubClusterResponsePBImpl.java

@@ -20,7 +20,10 @@
 import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.federation.proto.YarnServerFederationProtos.AddApplicationHomeSubClusterResponseProto;
+import org.apache.hadoop.yarn.federation.proto.YarnServerFederationProtos.AddApplicationHomeSubClusterResponseProtoOrBuilder;
+import org.apache.hadoop.yarn.federation.proto.YarnServerFederationProtos.SubClusterIdProto;
 import org.apache.hadoop.yarn.server.federation.store.records.AddApplicationHomeSubClusterResponse;
+import org.apache.hadoop.yarn.server.federation.store.records.SubClusterId;
 
 import com.google.protobuf.TextFormat;
 
@@ -48,12 +51,40 @@ public AddApplicationHomeSubClusterResponsePBImpl(
     viaProto = true;
   }
 
+  private void maybeInitBuilder() {
+    if (viaProto || builder == null) {
+      builder = AddApplicationHomeSubClusterResponseProto.newBuilder(proto);
+    }
+    viaProto = false;
+  }
+
   public AddApplicationHomeSubClusterResponseProto getProto() {
     proto = viaProto ? proto : builder.build();
     viaProto = true;
     return proto;
   }
 
+  @Override
+  public void setHomeSubCluster(SubClusterId homeSubCluster) {
+    maybeInitBuilder();
+    if (homeSubCluster == null) {
+      builder.clearHomeSubCluster();
+      return;
+    }
+    builder.setHomeSubCluster(convertToProtoFormat(homeSubCluster));
+  }
+
+  @Override
+  public SubClusterId getHomeSubCluster() {
+    AddApplicationHomeSubClusterResponseProtoOrBuilder p =
+        viaProto ? proto : builder;
+
+    if (!p.hasHomeSubCluster()) {
+      return null;
+    }
+    return convertFromProtoFormat(p.getHomeSubCluster());
+  }
+
   @Override
   public int hashCode() {
     return getProto().hashCode();
@@ -75,4 +106,12 @@ public String toString() {
     return TextFormat.shortDebugString(getProto());
   }
 
+  private SubClusterId convertFromProtoFormat(SubClusterIdProto sc) {
+    return new SubClusterIdPBImpl(sc);
+  }
+
+  private SubClusterIdProto convertToProtoFormat(SubClusterId sc) {
+    return ((SubClusterIdPBImpl) sc).getProto();
+  }
+
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/proto/yarn_server_federation_protos.proto

@@ -102,6 +102,7 @@ message AddApplicationHomeSubClusterRequestProto {
 }
 
 message AddApplicationHomeSubClusterResponseProto {
+  optional SubClusterIdProto home_sub_cluster = 1;
 }
 
 message UpdateApplicationHomeSubClusterRequestProto {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/FederationStateStoreBaseTest.java

@@ -94,7 +94,7 @@ public void testRegisterSubCluster() throws Exception {
   @Test
   public void testDeregisterSubCluster() throws Exception {
     SubClusterId subClusterId = SubClusterId.newInstance("SC");
-    registerSubCluster(subClusterId);
+    registerSubCluster(createSubClusterInfo(subClusterId));
 
     SubClusterDeregisterRequest deregisterRequest = SubClusterDeregisterRequest
         .newInstance(subClusterId, SubClusterState.SC_UNREGISTERED);
@@ -124,7 +124,7 @@ public void testGetSubClusterInfo() throws Exception {
 
     SubClusterId subClusterId = SubClusterId.newInstance("SC");
     SubClusterInfo subClusterInfo = createSubClusterInfo(subClusterId);
-    registerSubCluster(subClusterId);
+    registerSubCluster(subClusterInfo);
 
     GetSubClusterInfoRequest request =
         GetSubClusterInfoRequest.newInstance(subClusterId);
@@ -184,10 +184,10 @@ public void testGetAllSubClustersInfo() throws Exception {
   @Test
   public void testSubClusterHeartbeat() throws Exception {
     SubClusterId subClusterId = SubClusterId.newInstance("SC");
-    registerSubCluster(subClusterId);
+    registerSubCluster(createSubClusterInfo(subClusterId));
 
     SubClusterHeartbeatRequest heartbeatRequest = SubClusterHeartbeatRequest
-        .newInstance(subClusterId, SubClusterState.SC_RUNNING, "cabability");
+        .newInstance(subClusterId, SubClusterState.SC_RUNNING, "capability");
     stateStore.subClusterHeartbeat(heartbeatRequest);
 
     Assert.assertEquals(SubClusterState.SC_RUNNING,
@@ -199,7 +199,7 @@ public void testSubClusterHeartbeat() throws Exception {
   public void testSubClusterHeartbeatUnknownSubCluster() throws Exception {
     SubClusterId subClusterId = SubClusterId.newInstance("SC");
     SubClusterHeartbeatRequest heartbeatRequest = SubClusterHeartbeatRequest
-        .newInstance(subClusterId, SubClusterState.SC_RUNNING, "cabability");
+        .newInstance(subClusterId, SubClusterState.SC_RUNNING, "capability");
 
     try {
       stateStore.subClusterHeartbeat(heartbeatRequest);
@@ -213,7 +213,7 @@ public void testSubClusterHeartbeatUnknownSubCluster() throws Exception {
   // Test FederationApplicationHomeSubClusterStore
 
   @Test
-  public void testAddApplicationHomeSubClusterMap() throws Exception {
+  public void testAddApplicationHomeSubCluster() throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     SubClusterId subClusterId = SubClusterId.newInstance("SC");
     ApplicationHomeSubCluster ahsc =
@@ -222,15 +222,15 @@ public void testAddApplicationHomeSubClusterMap() throws Exception {
     AddApplicationHomeSubClusterRequest request =
         AddApplicationHomeSubClusterRequest.newInstance(ahsc);
     AddApplicationHomeSubClusterResponse response =
-        stateStore.addApplicationHomeSubClusterMap(request);
+        stateStore.addApplicationHomeSubCluster(request);
 
-    Assert.assertNotNull(response);
+    Assert.assertEquals(subClusterId, response.getHomeSubCluster());
     Assert.assertEquals(subClusterId, queryApplicationHomeSC(appId));
 
   }
 
   @Test
-  public void testAddApplicationHomeSubClusterMapAppAlreadyExists()
+  public void testAddApplicationHomeSubClusterAppAlreadyExists()
       throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     SubClusterId subClusterId1 = SubClusterId.newInstance("SC1");
@@ -240,21 +240,17 @@ public void testAddApplicationHomeSubClusterMapAppAlreadyExists()
     ApplicationHomeSubCluster ahsc2 =
         ApplicationHomeSubCluster.newInstance(appId, subClusterId2);
 
-    try {
+    AddApplicationHomeSubClusterResponse response =
-      stateStore.addApplicationHomeSubClusterMap(
+        stateStore.addApplicationHomeSubCluster(
             AddApplicationHomeSubClusterRequest.newInstance(ahsc2));
-      Assert.fail();
-    } catch (YarnException e) {
-      Assert.assertTrue(e.getMessage()
-          .startsWith("Application " + appId.toString() + " already exists"));
-    }
 
+    Assert.assertEquals(subClusterId1, response.getHomeSubCluster());
     Assert.assertEquals(subClusterId1, queryApplicationHomeSC(appId));
 
   }
 
   @Test
-  public void testDeleteApplicationHomeSubClusterMap() throws Exception {
+  public void testDeleteApplicationHomeSubCluster() throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     SubClusterId subClusterId = SubClusterId.newInstance("SC");
     addApplicationHomeSC(appId, subClusterId);
@@ -263,7 +259,7 @@ public void testDeleteApplicationHomeSubClusterMap() throws Exception {
         DeleteApplicationHomeSubClusterRequest.newInstance(appId);
 
     DeleteApplicationHomeSubClusterResponse response =
-        stateStore.deleteApplicationHomeSubClusterMap(delRequest);
+        stateStore.deleteApplicationHomeSubCluster(delRequest);
 
     Assert.assertNotNull(response);
     try {
@@ -277,14 +273,13 @@ public void testDeleteApplicationHomeSubClusterMap() throws Exception {
   }
 
   @Test
-  public void testDeleteApplicationHomeSubClusterMapUnknownApp()
+  public void testDeleteApplicationHomeSubClusterUnknownApp() throws Exception {
-      throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     DeleteApplicationHomeSubClusterRequest delRequest =
         DeleteApplicationHomeSubClusterRequest.newInstance(appId);
 
     try {
-      stateStore.deleteApplicationHomeSubClusterMap(delRequest);
+      stateStore.deleteApplicationHomeSubCluster(delRequest);
       Assert.fail();
     } catch (YarnException e) {
       Assert.assertTrue(e.getMessage()
@@ -293,7 +288,7 @@ public void testDeleteApplicationHomeSubClusterMapUnknownApp()
   }
 
   @Test
-  public void testGetApplicationHomeSubClusterMap() throws Exception {
+  public void testGetApplicationHomeSubCluster() throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     SubClusterId subClusterId = SubClusterId.newInstance("SC");
     addApplicationHomeSC(appId, subClusterId);
@@ -302,7 +297,7 @@ public void testGetApplicationHomeSubClusterMap() throws Exception {
         GetApplicationHomeSubClusterRequest.newInstance(appId);
 
     GetApplicationHomeSubClusterResponse result =
-        stateStore.getApplicationHomeSubClusterMap(getRequest);
+        stateStore.getApplicationHomeSubCluster(getRequest);
 
     Assert.assertEquals(appId,
         result.getApplicationHomeSubCluster().getApplicationId());
@@ -311,13 +306,13 @@ public void testGetApplicationHomeSubClusterMap() throws Exception {
   }
 
   @Test
-  public void testGetApplicationHomeSubClusterMapUnknownApp() throws Exception {
+  public void testGetApplicationHomeSubClusterUnknownApp() throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     GetApplicationHomeSubClusterRequest request =
         GetApplicationHomeSubClusterRequest.newInstance(appId);
 
     try {
-      stateStore.getApplicationHomeSubClusterMap(request);
+      stateStore.getApplicationHomeSubCluster(request);
       Assert.fail();
     } catch (YarnException e) {
       Assert.assertTrue(e.getMessage()
@@ -326,7 +321,7 @@ public void testGetApplicationHomeSubClusterMapUnknownApp() throws Exception {
   }
 
   @Test
-  public void testGetApplicationsHomeSubClusterMap() throws Exception {
+  public void testGetApplicationsHomeSubCluster() throws Exception {
     ApplicationId appId1 = ApplicationId.newInstance(1, 1);
     SubClusterId subClusterId1 = SubClusterId.newInstance("SC1");
     ApplicationHomeSubCluster ahsc1 =
@@ -344,7 +339,7 @@ public void testGetApplicationsHomeSubClusterMap() throws Exception {
         GetApplicationsHomeSubClusterRequest.newInstance();
 
     GetApplicationsHomeSubClusterResponse result =
-        stateStore.getApplicationsHomeSubClusterMap(getRequest);
+        stateStore.getApplicationsHomeSubCluster(getRequest);
 
     Assert.assertEquals(2, result.getAppsHomeSubClusters().size());
     Assert.assertTrue(result.getAppsHomeSubClusters().contains(ahsc1));
@@ -352,7 +347,7 @@ public void testGetApplicationsHomeSubClusterMap() throws Exception {
   }
 
   @Test
-  public void testUpdateApplicationHomeSubClusterMap() throws Exception {
+  public void testUpdateApplicationHomeSubCluster() throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     SubClusterId subClusterId1 = SubClusterId.newInstance("SC1");
     addApplicationHomeSC(appId, subClusterId1);
@@ -365,16 +360,14 @@ public void testUpdateApplicationHomeSubClusterMap() throws Exception {
         UpdateApplicationHomeSubClusterRequest.newInstance(ahscUpdate);
 
     UpdateApplicationHomeSubClusterResponse response =
-        stateStore.updateApplicationHomeSubClusterMap(updateRequest);
+        stateStore.updateApplicationHomeSubCluster(updateRequest);
 
     Assert.assertNotNull(response);
-
     Assert.assertEquals(subClusterId2, queryApplicationHomeSC(appId));
   }
 
   @Test
-  public void testUpdateApplicationHomeSubClusterMapUnknownApp()
+  public void testUpdateApplicationHomeSubClusterUnknownApp() throws Exception {
-      throws Exception {
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     SubClusterId subClusterId1 = SubClusterId.newInstance("SC1");
     ApplicationHomeSubCluster ahsc =
@@ -384,7 +377,7 @@ public void testUpdateApplicationHomeSubClusterMapUnknownApp()
         UpdateApplicationHomeSubClusterRequest.newInstance(ahsc);
 
     try {
-      stateStore.updateApplicationHomeSubClusterMap((updateRequest));
+      stateStore.updateApplicationHomeSubCluster((updateRequest));
       Assert.fail();
     } catch (YarnException e) {
       Assert.assertTrue(e.getMessage()
@@ -484,7 +477,7 @@ private SubClusterInfo createSubClusterInfo(SubClusterId subClusterId) {
 
     return SubClusterInfo.newInstance(subClusterId, amRMAddress,
         clientRMAddress, rmAdminAddress, webAppAddress, SubClusterState.SC_NEW,
-        CLOCK.getTime(), "cabability");
+        CLOCK.getTime(), "capability");
   }
 
   private SubClusterPolicyConfiguration createSCPolicyConf(String queueName,
@@ -499,7 +492,7 @@ private void addApplicationHomeSC(ApplicationId appId,
         ApplicationHomeSubCluster.newInstance(appId, subClusterId);
     AddApplicationHomeSubClusterRequest request =
         AddApplicationHomeSubClusterRequest.newInstance(ahsc);
-    stateStore.addApplicationHomeSubClusterMap(request);
+    stateStore.addApplicationHomeSubCluster(request);
   }
 
   private void setPolicyConf(String queue, String policyType)
@@ -510,10 +503,8 @@ private void setPolicyConf(String queue, String policyType)
     stateStore.setPolicyConfiguration(request);
   }
 
-  private void registerSubCluster(SubClusterId subClusterId)
+  private void registerSubCluster(SubClusterInfo subClusterInfo)
       throws YarnException {
-
-    SubClusterInfo subClusterInfo = createSubClusterInfo(subClusterId);
     stateStore.registerSubCluster(
         SubClusterRegisterRequest.newInstance(subClusterInfo));
   }
@@ -531,7 +522,7 @@ private SubClusterId queryApplicationHomeSC(ApplicationId appId)
         GetApplicationHomeSubClusterRequest.newInstance(appId);
 
     GetApplicationHomeSubClusterResponse response =
-        stateStore.getApplicationHomeSubClusterMap(request);
+        stateStore.getApplicationHomeSubCluster(request);
 
     return response.getApplicationHomeSubCluster().getHomeSubCluster();
   }