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https://issues.apache.org/jira/browse/YARN-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109327#comment-15109327
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Jason Lowe commented on YARN-4610:
----------------------------------

TestAbstractYarnScheduler is failing the same way occasionally on trunk without 
the patch applied.  Filed YARN-4615.

> 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
>         Attachments: YARN-4610.001.patch
>
>
> 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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