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https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14210143#comment-14210143
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Arun C Murthy commented on YARN-2853:
-------------------------------------
I've merged this back into branch-2.6 for hadoop-2.6.0-rc1.
> 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
> Fix For: 2.6.0
>
> 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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