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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4662) JobHistoryFilesManager thread pool never expands
Date Tue, 25 Sep 2012 14:40:08 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4662?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas Graves updated MAPREDUCE-4662:
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.2.0
           Status: Resolved  (was: Patch Available)

I committed this. Thanks Kihwal!
                
> 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
>             Fix For: 1.2.0
>
>         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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