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https://issues.apache.org/jira/browse/YARN-11398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17648851#comment-17648851
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Daniel Ma commented on YARN-11398:
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PR link:
github.com/apache/hadoop/pull/5233
> ResourceManager DelegationTokenRenewer timeout feature may cause high
> utilization of CPU and object leak.
> ---------------------------------------------------------------------------------------------------------
>
> Key: YARN-11398
> URL: https://issues.apache.org/jira/browse/YARN-11398
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 3.3.1, 3.3.2, 3.3.3, 3.3.4
> Reporter: Daniel Ma
> Priority: Major
> Labels: pull-request-available
>
> ResourceManager DelegationTokenRenewer timeout feature may cause high
> utilization of CPU and object leak.
> 1-If yarn cluster is in idle state, that is almost no token renewer event
> triggered, the DelegationTokenRenewerPoolTracker thread will do nothing but
> dead loop, it will cause high CPU utilization.
> 2-The renewer event is hold in a map named futures, will has no remove logic
> , that is the map will become increasingly great with time going by.
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