Jason Lowe created YARN-4000:

             Summary: RM crashes with NPE if leaf queue becomes parent queue 
during restart
                 Key: YARN-4000
                 URL: https://issues.apache.org/jira/browse/YARN-4000
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler, resourcemanager
    Affects Versions: 2.6.0
            Reporter: Jason Lowe

This is a similar situation to YARN-2308.  If an application is active in queue 
A and then the RM restarts with a changed capacity scheduler configuration 
where queue A becomes a parent queue to other subqueues then the RM will crash 
with a NullPointerException.

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