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https://issues.apache.org/jira/browse/YARN-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14248839#comment-14248839
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Jason Lowe commented on YARN-2972:
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This is the same kind of situation as MAPREDUCE-4662, and I think the same type
of fix applies here. We are already specifying that core threads can exit when
sufficiently idle.
> 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
>
> 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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