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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2721) Race condition: ZKRMStateStore retry logic may throw NodeExist exception
Date Wed, 22 Oct 2014 12:14:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-2721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14179842#comment-14179842
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Tsuyoshi OZAWA commented on YARN-2721:
--------------------------------------

Good job, Jian. Created YARN-2725 for adding tests to cover these cases.

> 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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