slfan1989 commented on code in PR #4904:
URL: https://github.com/apache/hadoop/pull/4904#discussion_r976351036


##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/test/java/org/apache/hadoop/yarn/server/router/clientrm/TestFederationClientInterceptor.java:
##########
@@ -582,9 +583,9 @@ public void testGetClusterMetricsRequest() throws Exception 
{
     ClientMethod remoteMethod = new ClientMethod("getClusterMetrics",
         new Class[] {GetClusterMetricsRequest.class},
         new Object[] {GetClusterMetricsRequest.newInstance()});
-    Map<SubClusterId, GetClusterMetricsResponse> clusterMetrics = interceptor.
-        invokeConcurrent(new ArrayList<>(), remoteMethod, 
GetClusterMetricsResponse.class);
-    Assert.assertTrue(clusterMetrics.isEmpty());
+    Collection<GetClusterMetricsResponse> clusterMetrics = interceptor.
+        invokeConcurrent(remoteMethod, GetClusterMetricsResponse.class);
+    Assert.assertTrue(!clusterMetrics.isEmpty());

Review Comment:
   I will fix it.



##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/utils/FederationStateStoreFacade.java:
##########
@@ -728,6 +729,18 @@ public FederationStateStore getStateStore() {
   }
 
   /**
+   * Get Active's SubClusterIds{@link SubClusterId}.
+   *
+   * @return SubClusterId Collection.
+   * @throws YarnException if the call to get active subClusterIds is 
unsuccessful
+   */
+  public Collection<SubClusterId> getActiveSubClusterIds() throws 
YarnException {
+    Map<SubClusterId, SubClusterInfo> activeSubClusters =

Review Comment:
   I will fix it.



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