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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3136) getTransferredContainers can be a bottleneck during AM registration
Date Thu, 05 Feb 2015 10:15:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-3136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306951#comment-14306951
] 

Varun Saxena commented on YARN-3136:
------------------------------------

[~sunilg], you had left it unassigned and not mentioned that you are looking to work on it.
That's why took it up. :)

> getTransferredContainers can be a bottleneck during AM registration
> -------------------------------------------------------------------
>
>                 Key: YARN-3136
>                 URL: https://issues.apache.org/jira/browse/YARN-3136
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Sunil G
>
> While examining RM stack traces on a busy cluster I noticed a pattern of AMs stuck waiting
for the scheduler lock trying to call getTransferredContainers.  The scheduler lock is highly
contended, especially on a large cluster with many nodes heartbeating, and it would be nice
if we could find a way to eliminate the need to grab this lock during this call.  We've already
done similar work during AM allocate calls to make sure they don't needlessly grab the scheduler
lock, and it would be good to do so here as well, if possible.



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