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https://issues.apache.org/jira/browse/YARN-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14251767#comment-14251767
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Hudson commented on YARN-2972:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #46 (See 
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/46/])
YARN-2972. DelegationTokenRenewer thread pool never expands. Contributed by 
Jason Lowe (junping_du: rev 2b4b0e8847048850206f091c6870a02e08cfe836)
* hadoop-yarn-project/CHANGES.txt
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/security/DelegationTokenRenewer.java


> 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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