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https://issues.apache.org/jira/browse/MAPREDUCE-4662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13460512#comment-13460512
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Thomas Graves commented on MAPREDUCE-4662:
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+1. I'll commit this later today if no one else has comments.
> 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
> Assignee: Kihwal Lee
> Attachments: mapreduce-4662.branch-1.patch,
> mapreduce-4662.branch-1.patch
>
>
> 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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