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https://issues.apache.org/jira/browse/YARN-11588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17779534#comment-17779534
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ASF GitHub Bot commented on YARN-11588:
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slfan1989 opened a new pull request, #6222:
URL: https://github.com/apache/hadoop/pull/6222
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### Description of PR
JIRA: YARN-11588. [Federation] [Addendum] Fix uncleaned threads in yarn
router thread pool executor.
### How was this patch tested?
### For code changes:
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> Fix uncleaned threads in YARN Federation interceptor threadpool
> ---------------------------------------------------------------
>
> Key: YARN-11588
> URL: https://issues.apache.org/jira/browse/YARN-11588
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Jeffrey Chang
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> In YARN Federation a new interceptor is generated for each new user that
> calls YARN Router. This also generates a threadpool which is used to call
> YARN RM. However, when the call is finished the threadpool threads never
> exits, causing the interceptor object for the user to never be cleaned up.
> This causes an issue when the number of users is large in the YARN cluster,
> as the number of idle, uncleaned thread can reach # of users calling router
> times number of active core threads in thread pool. This causes performance
> issues in router due to too many idle threads.
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