slfan1989 commented on code in PR #4701:
URL: https://github.com/apache/hadoop/pull/4701#discussion_r940824886
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/utils/FederationStateStoreFacade.java:
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@@ -376,10 +378,23 @@ public void updateApplicationHomeSubCluster(
*/
public SubClusterId getApplicationHomeSubCluster(ApplicationId appId)
throws YarnException {
- GetApplicationHomeSubClusterResponse response =
- stateStore.getApplicationHomeSubCluster(
+ try {
+ if (isCachingEnabled()) {
+ Object value =
+ cache.get(buildGetApplicationHomeSubClusterRequest(appId));
+ if (value instanceof SubClusterId) {
+ return (SubClusterId) value;
+ } else {
+ throw new YarnException("Cannot be converted to SubClusterId.");
Review Comment:
This part of the code does need cast, I simplified the code.
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