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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4610) Reservations continue looking for one app causes other apps to starve
Date Tue, 19 Jan 2016 23:46:39 GMT

     [ https://issues.apache.org/jira/browse/YARN-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jason Lowe updated YARN-4610:
    Attachment: YARN-4610.001.patch

Patch that resets the amount needed to unreserve at the beginning of canAssignToUser.  That
way subsequent users in the loop will not accidentally inherit a previous user's amount.

A potential workaround until this appears in a release is to set yarn.scheduler.capacity.reservations-continue-look-all-nodes
to false in capacity-scheduler.xml.  Note that this property is refreshable via yarn rmadmin
-refreshQueues, so changing it does not require a restart.  After this fix the property should
be restored to true to avoid the original issue fixed in YARN-3434.

> 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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