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https://issues.apache.org/jira/browse/YARN-11112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18038194#comment-18038194
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ASF GitHub Bot commented on YARN-11112:
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github-actions[bot] closed pull request #4198: YARN-11112 Avoid renewing
delegation token when app is first submitte…
URL: https://github.com/apache/hadoop/pull/4198
> Avoid renewing delegation token when app is first submitted to RM
> -----------------------------------------------------------------
>
> Key: YARN-11112
> URL: https://issues.apache.org/jira/browse/YARN-11112
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Yuanbo Liu
> Assignee: Yuanbo Liu
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2022-04-19-10-34-59-573.png,
> image-2022-04-19-10-38-01-194.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When auth is enabled by NameNode, then delegation token is required if
> application needs to acess files/directoies. We find that when app is first
> submitted to RM, RM renewer will renew app token no matter whether token is
> expired or not. Renewing token is a bit heavy since it uses global write
> lock. Here is the result when delegation token is required in a very busy
> cluster.
> !image-2022-04-19-10-34-59-573.png|width=515,height=302!
> !image-2022-04-19-10-38-01-194.png|width=490,height=290!
>
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