slfan1989 commented on code in PR #4701:
URL: https://github.com/apache/hadoop/pull/4701#discussion_r941869799


##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/utils/FederationStateStoreFacade.java:
##########
@@ -513,6 +524,25 @@ public Map<String, SubClusterPolicyConfiguration> invoke(
     return cacheRequest;
   }
 
+  private Object buildGetApplicationHomeSubClusterRequest(ApplicationId 
applicationId) {
+    final String cacheKey = buildCacheKey(getClass().getSimpleName(),
+        GET_APPLICATION_HOME_SUBCLUSTER_CACHEID, applicationId.toString());
+    CacheRequest<String, SubClusterId> cacheRequest = new CacheRequest<>(
+        cacheKey,
+        input -> {
+            GetApplicationHomeSubClusterResponse response =
+                stateStore.getApplicationHomeSubCluster(
+                    
GetApplicationHomeSubClusterRequest.newInstance(applicationId));
+
+            ApplicationHomeSubCluster applicationHomeSubCluster =

Review Comment:
   I will fix it.



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