Tao Yang created YARN-7003:

             Summary: DRAINING state of queues can't be recovered after RM 
                 Key: YARN-7003
                 URL: https://issues.apache.org/jira/browse/YARN-7003
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
    Affects Versions: 3.0.0-alpha3
            Reporter: Tao Yang

DRAINING state is a temporary state in RM memory, when queue state is set to be 
STOPPED but there are still some pending or active apps in it, the queue state 
will be changed to DRAINING instead of STOPPED after refreshing queues. We've 
encountered the problem that the state of this queue will aways be STOPPED 
after RM restarted, so that it can be removed at any time and leave some apps 
in a non-existing queue.
To fix this problem, we could recover DRAINING state in the recovery process of 
pending/active apps. I will upload a patch with test case later for review.

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