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Date: Mon, 7 Nov 2011 07:57:51 +0000 (UTC)
From: "zhaoyunjiong (Updated) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Updated] (MAPREDUCE-3343) TaskTracker Out of Memory because
 of distributed cache
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

zhaoyunjiong updated MAPREDUCE-3343:
------------------------------------

    Attachment: bug-fix-avoid-memory-leak-in-TrackerDistributedCacheManager.patch

patch for avoid memory leak.
                
> TaskTracker Out of Memory because of distributed cache
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-3343
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3343
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv1
>    Affects Versions: 0.20.205.0
>            Reporter: Ahmed Radwan
>              Labels: mapreduce, patch
>         Attachments: bug-fix-avoid-memory-leak-in-TrackerDistributedCacheManager.patch
>
>
> This Out of Memory happens when you run large number of jobs (using the distributed cache) on a TaskTracker. 
> Seems the basic issue is with the distributedCacheManager (instance of TrackerDistributedCacheManager in TaskTracker.java), this gets created during TaskTracker.initialize(), and it keeps references to TaskDistributedCacheManager for every submitted job via the jobArchives Map, also references to CacheStatus via cachedArchives map. I am not seeing these cleaned up between jobs, so this can out of memory problems after really large number of jobs are submitted. We have seen this issue in a number of cases.

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