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Date: Wed, 19 Sep 2012 03:06:07 +1100 (NCT)
From: "Thomas Graves (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
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Subject: [jira] [Created] (MAPREDUCE-4662) JobHistoryFilesManager thread
 pool never expands
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Thomas Graves created MAPREDUCE-4662:
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             Summary: JobHistoryFilesManager thread pool never expands
                 Key: MAPREDUCE-4662
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4662
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobhistoryserver
    Affects Versions: 1.0.2
            Reporter: Thomas Graves


The job history file manager creates a threadpool with core size 1 thread, max pool size 3.   It never goes beyond 1 thread though because its using a LinkedBlockingQueue which doesn't have a max size. 

    void start() {
      executor = new ThreadPoolExecutor(1, 3, 1,
          TimeUnit.HOURS, new LinkedBlockingQueue<Runnable>());
    }

According to the ThreadPoolExecutor java doc page it only increases the number of threads when the queue is full. Since the queue we are using has no max size it never fills up and we never get more then 1 thread. 

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