Jason Lowe created YARN-3487:
--------------------------------

             Summary: CapacityScheduler.getQueueInfo grabs scheduler lock 
unnecessarily
                 Key: YARN-3487
                 URL: https://issues.apache.org/jira/browse/YARN-3487
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
    Affects Versions: 2.6.0
            Reporter: Jason Lowe
            Assignee: Jason Lowe
            Priority: Critical


Recently saw a significant slowdown of applications on a large cluster, and we 
noticed there were a large number of blocked threads on the RM.  Most of the 
blocked threads were waiting for the CapacityScheduler lock while calling 
getQueueInfo.



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