Rohith created YARN-2946:
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             Summary: Deadlock in ZKRMStateStore
                 Key: YARN-2946
                 URL: https://issues.apache.org/jira/browse/YARN-2946
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 2.6.0
            Reporter: Rohith
            Assignee: Rohith


Found one deadlock in ZKRMStateStore.
# Initial stage zkClient is null because of zk disconnected event.
# When ZKRMstatestore#runWithCheck()  wait(zkSessionTimeout) for zkClient to re 
establish zookeeper connection either via synconnected or expired event, it is 
highly possible that any other thred can obtain lock on {{ZKRMStateStore.this}} 
from state machine transition events. This cause Deadlock in ZKRMStateStore.



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