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Posted to yarn-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2016/01/19 22:51:39 UTC

[jira] [Created] (YARN-4610) Reservations continue looking for one app causes other apps to starve

Jason Lowe created YARN-4610:
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             Summary: Reservations continue looking for one app causes other apps to starve
                 Key: YARN-4610
                 URL: https://issues.apache.org/jira/browse/YARN-4610
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
    Affects Versions: 2.7.1
            Reporter: Jason Lowe
            Assignee: Jason Lowe
            Priority: Blocker


CapacityScheduler's LeafQueue has "reservations continue looking" logic that allows an application to unreserve elsewhere to fulfil a container request on a node that has available space.  However in 2.7 that logic seems to break allocations for subsequent apps in the queue.  Once a user hits its user limit, subsequent apps in the queue for other users receive containers at a significantly reduced rate.



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