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https://issues.apache.org/jira/browse/YARN-2313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsuyoshi OZAWA updated YARN-2313:
---------------------------------

    Attachment: rm-stack-trace.txt

Attached stack trace when we faced the problem.

> Livelock can occur on FairScheduler when there are lots entry in queue
> ----------------------------------------------------------------------
>
>                 Key: YARN-2313
>                 URL: https://issues.apache.org/jira/browse/YARN-2313
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.4.1
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: YARN-2313.1.patch, rm-stack-trace.txt
>
>
> Observed livelock on FairScheduler when there are lots entry in queue. After 
> my investigating code, following case can occur:
> 1. {{update()}} called by UpdateThread takes longer times than 
> UPDATE_INTERVAL(500ms) if there are lots queue.
> 2. UpdateThread goes busy loop.
> 3. Other threads(AllocationFileReloader, 
> ResourceManager$SchedulerEventDispatcher) can wait forever.



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