Jun Gong created YARN-3469:

             Summary: Do not set watch for most cases in ZKRMStateStore
                 Key: YARN-3469
                 URL: https://issues.apache.org/jira/browse/YARN-3469
             Project: Hadoop YARN
          Issue Type: Improvement
    Affects Versions: 2.6.0
            Reporter: Jun Gong
            Assignee: Jun Gong
            Priority: Minor

In ZKRMStateStore, most operations(e.g. getDataWithRetries, getDataWithRetries, 
getDataWithRetries) set watches on znode. Large watches will cause problem such 
as [ZOOKEEPER-706: large numbers of watches can cause session re-establishment 
to fail](https://issues.apache.org/jira/browse/ZOOKEEPER-706).  

Although there is a workaround that setting jute.maxbuffer to a larger value, 
we need to adjust this value once there are more app and attempts stored in ZK. 
And those watches are useless now. It might be better that do not set watches.

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