slfan1989 commented on code in PR #6190:
URL: https://github.com/apache/hadoop/pull/6190#discussion_r1374746304
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/webapp/FederationInterceptorREST.java:
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@@ -827,7 +828,7 @@ public AppsInfo getApps(HttpServletRequest hsr, String
stateQuery,
});
if (apps.getApps().isEmpty()) {
- return null;
+ return new AppsInfo();
Review Comment:
After comparing the results from the ResourceManager (RM), if it doesn't
return any results, we should return an empty object instead of null.
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