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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-2313) Livelock can occur on FairScheduler when there are lots of running apps
Date Wed, 23 Jul 2014 04:52:38 GMT

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

Sandy Ryza updated YARN-2313:
-----------------------------

    Summary: Livelock can occur on FairScheduler when there are lots of running apps  (was:
Livelock can occur on FairScheduler when there are lots entry in queue)

> Livelock can occur on FairScheduler when there are lots of running apps
> -----------------------------------------------------------------------
>
>                 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, YARN-2313.2.patch, YARN-2313.3.patch, YARN-2313.4.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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