[jira] [Commented] (YARN-3136) getTransferredContainers can be a bottleneck during AM registration

["Wangda Tan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-3136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988110#comment-14988110 ] 

Wangda Tan commented on YARN-3136:
----------------------------------

Backport and commit to branch-2.7. Ran all tests of resourcemanager before pushing. Attaching patch which is committed to branch-2.7.

> 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
>              Labels: 2.7.2-candidate
>             Fix For: 2.8.0, 2.7.2
>
>         Attachments: 0001-YARN-3136.patch, 00010-YARN-3136.patch, 00011-YARN-3136.patch, 00012-YARN-3136.patch, 00013-YARN-3136.patch, 0002-YARN-3136.patch, 0003-YARN-3136.patch, 0004-YARN-3136.patch, 0005-YARN-3136.patch, 0006-YARN-3136.patch, 0007-YARN-3136.patch, 0008-YARN-3136.patch, 0009-YARN-3136.patch, YARN-3136.branch-2.7.patch
>
>
> 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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