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https://issues.apache.org/jira/browse/YARN-2721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14179573#comment-14179573
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Hudson commented on YARN-2721:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #6309 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/6309/])
YARN-2721. Suppress NodeExist exception thrown by ZKRMStateStore when it
retries creating znode. Contributed by Jian He. (zjshen: rev
7e3b5e6f5cb4945b4fab27e8a83d04280df50e17)
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/ZKRMStateStore.java
* hadoop-yarn-project/CHANGES.txt
> 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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