Jason Lowe created YARN-3137:
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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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