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https://issues.apache.org/jira/browse/YARN-7262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220963#comment-16220963
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Hadoop QA commented on YARN-7262:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 5s{color}
| {color:red} YARN-7262 does not apply to trunk. Rebase required? Wrong Branch?
See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | YARN-7262 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12892940/YARN-7262.003.patch |
| Console output |
https://builds.apache.org/job/PreCommit-YARN-Build/18157/console |
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This message was automatically generated.
> 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
> Attachments: YARN-7262.001.patch, YARN-7262.002.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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