imback82 commented on a change in pull request #28435:
URL: https://github.com/apache/spark/pull/28435#discussion_r419005627



##########
File path: 
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
##########
@@ -727,6 +729,10 @@ private[spark] class ApplicationMaster(
             mainMethod.invoke(null, userArgs.toArray)
             finish(FinalApplicationStatus.SUCCEEDED, 
ApplicationMaster.EXIT_SUCCESS)
             logDebug("Done running user class")
+            if (!unregistered) {
+              unregister(finalStatus, finalMsg)
+              cleanupStagingDir(defaultStagingDir)
+            }

Review comment:
       One question I have is the following comment:
   
https://github.com/apache/spark/blob/13dddee9a8490ead00ff00bd741db4a170dfd759/resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala#L236-L238
   
   This hook is responsible calling `unregister`. So, if the user code didn't 
explicitly stop the `SparkContext`, this change calls `unregister` before 
`SparkContext` is stopped. Will this be OK? (from my testing, I didn't find 
anything wrong so far, but I could be missing something.)




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