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https://issues.apache.org/jira/browse/YARN-3136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308446#comment-16308446
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Jason Lowe commented on YARN-3136:
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bq. could you please tell me what is the jira about We've already done similar
work during AM allocate calls to make sure they don't needlessly grab the
scheduler lock ?
I was not referring to a specific JIRA but rather the existing structure of
the code where the scheduler drops off allocated containers for the AM to pick
up without needing to grab the scheduler lock. If you're seeing a lot of
blocked IPC threads for AM allocate calls then I think you should file a new
JIRA with the common stack trace(s) showing how it's blocked. We can then move
the discussion there.
> 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, 3.0.0-alpha1
>
> 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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