[jira] [Created] (YARN-2171) AMs block on the CapacityScheduler lock during allocate()

[Jason Lowe (JIRA)]

Jason Lowe created YARN-2171:
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             Summary: 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: 2.4.0, 0.23.10
            Reporter: Jason Lowe
            Assignee: Jason Lowe
            Priority: Critical


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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