goiri commented on code in PR #4543:
URL: https://github.com/apache/hadoop/pull/4543#discussion_r918197490


##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/webapp/FederationInterceptorREST.java:
##########
@@ -1336,7 +1336,51 @@ public AppAttemptInfo getAppAttempt(HttpServletRequest 
req,
   @Override
   public ContainersInfo getContainers(HttpServletRequest req,
       HttpServletResponse res, String appId, String appAttemptId) {
-    throw new NotImplementedException("Code is not implemented");
+    ContainersInfo containersInfo = new ContainersInfo();
+
+    Map<SubClusterId, SubClusterInfo> subClustersActive = null;
+    try {
+      subClustersActive = federationFacade.getSubClusters(true);
+    } catch (YarnException e) {
+      LOG.error(e.getLocalizedMessage());

Review Comment:
   Are we OK just swallowing this?



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