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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4610) Reservations continue looking for one app causes other apps to starve
Date Wed, 20 Jan 2016 15:19:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15108697#comment-15108697
] 

Thomas Graves commented on YARN-4610:
-------------------------------------

+1.  Thanks for fixing this. 

> 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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