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https://issues.apache.org/jira/browse/YARN-2962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14527299#comment-14527299
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Vinod Kumar Vavilapalli commented on YARN-2962:
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Thinking more, the new RM moving to a hierarchy is also a problem with
(rolling) downgrade. We may have to write a tool for admins to run when
downgrading from this new scheme to the old scheme.
> 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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