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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4610) Reservations continue looking for one app causes other apps to starve
Date Thu, 21 Jan 2016 14:39:40 GMT

    [ https://issues.apache.org/jira/browse/YARN-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15110674#comment-15110674

Jason Lowe commented on YARN-4610:

Whitespace complaints are bogus, and test failures are unrelated.  The TestClientRMTokens
and TestAMAuthorization failures are the same as in trunk.  TestSystemMetricsPublisher is
failing on branch-2.7 without the patch, filed YARN-4623.

> 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-branch-2.7.002.patch, YARN-4610.001.patch, YARN-4610.branch-2.7.001.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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