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https://issues.apache.org/jira/browse/YARN-2721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14180011#comment-14180011
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Hudson commented on YARN-2721:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1934 (See 
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1934/])
YARN-2721. Suppress NodeExist exception thrown by ZKRMStateStore when it 
retries creating znode. Contributed by Jian He. (zjshen: rev 
7e3b5e6f5cb4945b4fab27e8a83d04280df50e17)
* hadoop-yarn-project/CHANGES.txt
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/ZKRMStateStore.java


> 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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