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https://issues.apache.org/jira/browse/YARN-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250965#comment-14250965
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Junping Du commented on YARN-2972:
----------------------------------

I have commit it to trunk and branch-2. Thanks [~jlowe] for contributing a 
patch!

> 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
>             Fix For: 2.7.0
>
>         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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