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https://issues.apache.org/jira/browse/YARN-2171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves updated YARN-2171:
--------------------------------

    Priority: Critical  (was: Major)

> 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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