Jian He updated YARN-2853:
    Attachment:     (was: YARN-2853.1.patch)

> 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
>         Attachments: YARN-2853.1.patch, YARN-2853.1.patch
> 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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