Jason Lowe created YARN-3137:

             Summary: CapacityScheduler.checkAccess unnecessarily grabs the 
scheduler lock
                 Key: YARN-3137
                 URL: https://issues.apache.org/jira/browse/YARN-3137
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.5.0
            Reporter: Jason Lowe

The queues are stored in a ConcurrentHashMap and the code already checks for a 
null queue.  At best we need to lock individual queues when processing the 
access check, but I don't see why we need to grab the highly-contested 
scheduler lock to lookup which queue to use for the hasAccess call.

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