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https://issues.apache.org/jira/browse/YARN-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250116#comment-14250116
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Junping Du commented on YARN-2972:
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Nice catch, [~jlowe]!
+1. Patch looks good. Will commit it shortly.
> DelegationTokenRenewer thread pool never expands
> ------------------------------------------------
>
> Key: YARN-2972
> URL: https://issues.apache.org/jira/browse/YARN-2972
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.3.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Attachments: YARN-2972.001.patch
>
>
> DelegationTokenRenewer uses a thread pool to manage token renewals. The
> number of threads is configurable, but unfortunately the pool never expands
> beyond the hardcoded initial 5 threads because we are using an unbounded
> LinkedBlockingQueue. ThreadPoolExecutor only grows the thread pool beyond
> the core size when the specified queue is full.
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