Jian He commented on YARN-2136:

bq. Hence dispatcher queue draining shouldn't matter as ZKClient is already 
After checking the code, I think we should flip the order "closeInternal()" and 
"dispatcher.stop();"  right?
  protected void serviceStop() throws Exception {

> RMStateStore can explicitly handle store/update events when fenced
> ------------------------------------------------------------------
>                 Key: YARN-2136
>                 URL: https://issues.apache.org/jira/browse/YARN-2136
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
> RMStateStore can choose to handle/ignore store/update events upfront instead 
> of invoking more ZK operations if state store is at fenced state. 

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