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https://issues.apache.org/jira/browse/YARN-2171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14034060#comment-14034060
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Vinod Kumar Vavilapalli commented on YARN-2171:
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The code changes look fine enough to me.
The test is not so useful beyond validating this ticket, but that's okay. I see
that we don't have any test validating the number of nodes itself explicitly,
shall we add that here?
> 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
>
>
> 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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