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https://issues.apache.org/jira/browse/YARN-2171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14044100#comment-14044100
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Vinod Kumar Vavilapalli commented on YARN-2171:
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+1, looks good. Checking this in..
> AMs block on the CapacityScheduler lock during allocate()
> ---------------------------------------------------------
>
> Key: YARN-2171
> URL: https://issues.apache.org/jira/browse/YARN-2171
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 0.23.10, 2.4.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Critical
> Attachments: YARN-2171.patch, YARN-2171v2.patch
>
>
> When AMs heartbeat into the RM via the allocate() call they are blocking on
> the CapacityScheduler lock when trying to get the number of nodes in the
> cluster via getNumClusterNodes.
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