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https://issues.apache.org/jira/browse/YARN-2962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615069#comment-14615069
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Varun Saxena commented on YARN-2962:
------------------------------------

[~kasha],
The thing we primarily need to decide is do we need to be concerned about 
configuration changes ? Or assume that state store will be formatted if this 
config is changed.
Code in patch will throw an exception if app node format is not as per 
configuration, so on recovery, exception will indicate state store has to be 
formatted.

> ZKRMStateStore: Limit the number of znodes under a znode
> --------------------------------------------------------
>
>                 Key: YARN-2962
>                 URL: https://issues.apache.org/jira/browse/YARN-2962
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Karthik Kambatla
>            Assignee: Varun Saxena
>            Priority: Critical
>         Attachments: YARN-2962.01.patch, YARN-2962.2.patch, YARN-2962.3.patch
>
>
> We ran into this issue where we were hitting the default ZK server message 
> size configs, primarily because the message had too many znodes even though 
> they individually they were all small.



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