Jason Lowe created YARN-2972:

             Summary: 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: 2.5.0
            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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