Jian He created YARN-2853:

             Summary: Killing app may hang while AM is unregistering
                 Key: YARN-2853
                 URL: https://issues.apache.org/jira/browse/YARN-2853
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Jian He
            Assignee: Jian He

When killing an app, app first moves to KILLING state, If RMAppAttempt receives 
the attempt_unregister event before attempt_kill event,  it'll ignore the later 
attempt_kill event.  Hence, RMApp won't be able to move to KILLED state and 
stays at KILLING state forever.

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