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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3508) Preemption processing occuring on the main RM dispatcher
Date Wed, 01 Jul 2015 18:31:06 GMT

    [ https://issues.apache.org/jira/browse/YARN-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14610788#comment-14610788
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Wangda Tan commented on YARN-3508:
----------------------------------

Thanks for update, [~varun_saxena].

Checkstyle is fine to me, the patch generally looks good. [~jianhe]/[~jlowe], could you take
a look also?

> Preemption processing occuring on the main RM dispatcher
> --------------------------------------------------------
>
>                 Key: YARN-3508
>                 URL: https://issues.apache.org/jira/browse/YARN-3508
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, scheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>         Attachments: YARN-3508.002.patch, YARN-3508.01.patch, YARN-3508.03.patch, YARN-3508.04.patch,
YARN-3508.05.patch, YARN-3508.06.patch
>
>
> We recently saw the RM for a large cluster lag far behind on the AsyncDispacher event
queue.  The AsyncDispatcher thread was consistently blocked on the highly-contended CapacityScheduler
lock trying to dispatch preemption-related events for RMContainerPreemptEventDispatcher. 
Preemption processing should occur on the scheduler event dispatcher thread or a separate
thread to avoid delaying the processing of other events in the primary dispatcher queue.



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