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https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14208897#comment-14208897
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Jian He commented on YARN-2853:
-------------------------------

fixed the typo, re-kick jenkins

> 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, YARN-2853.2.patch, 
> YARN-2853.3.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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