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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2313) Livelock can occur on FairScheduler when there are lots entry in queue
Date Thu, 17 Jul 2014 17:35:05 GMT
Tsuyoshi OZAWA created YARN-2313:
------------------------------------

             Summary: 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


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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