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https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14210101#comment-14210101
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Hudson commented on YARN-2853:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #6535 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/6535/])
YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev
d648e60ebab7f1942dba92e9cd2cb62b8d70419b)
* hadoop-yarn-project/CHANGES.txt
> 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: 2.7.0
>
> 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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