Tsuyoshi OZAWA created YARN-2313:
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             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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