Jian He updated YARN-2721:
    Attachment: YARN-2721.1.patch

Trivial patch to ignore the potential Node_exist exception. Didn't include a 
unit test, because the test will be removed after YARN-2716. 

> Race condition: ZKRMStateStore retry logic may throw NodeExist exception 
> -------------------------------------------------------------------------
>                 Key: YARN-2721
>                 URL: https://issues.apache.org/jira/browse/YARN-2721
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Jian He
>             Fix For: 2.6.0
>         Attachments: YARN-2721.1.patch
> Blindly retrying operations in zookeeper will not work for non-idempotent 
> operations (like create znode). The reason is that the client can do a create 
> znode, but the response may not be returned because the server can die or 
> timeout. In case of retrying the create znode, it will throw a NODE_EXISTS 
> exception from the earlier create from the same session.  

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