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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7262) Add a hierarchy into the ZKRMStateStore for delegation token znodes to prevent jute buffer overflow
Date Mon, 30 Oct 2017 18:39:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-7262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16225516#comment-16225516
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Daniel Templeton commented on YARN-7262:
----------------------------------------

For the record, +1

> Add a hierarchy into the ZKRMStateStore for delegation token znodes to prevent jute buffer
overflow
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7262
>                 URL: https://issues.apache.org/jira/browse/YARN-7262
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>             Fix For: 2.9.0, 3.0.0
>
>         Attachments: YARN-7262.001.patch, YARN-7262.002.patch, YARN-7262.003.patch, YARN-7262.003.patch
>
>
> We've seen users who are running into a problem where the RM is storing so many delegation
tokens in the {{ZKRMStateStore}} that the _listing_ of those znodes is higher than the jute
buffer. This is fine during operations, but becomes a problem on a fail over because the RM
will try to read in all of the token znodes (i.e. call {{getChildren}} on the parent znode).
 This is particularly bad because everything appears to be okay, but then if a failover occurs
you end up with no active RMs.
> There was a similar problem with the Yarn application data that was fixed in YARN-2962
by adding a (configurable) hierarchy of znodes so the RM could pull subchildren without overflowing
the jute buffer (though it's off by default).
> We should add a hierarchy similar to that of YARN-2962, but for the delegation token
znodes.



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