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From "Ahmed Radwan (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3343) TaskTracker Out of Memory because of distributed cache
Date Thu, 03 Nov 2011 23:43:34 GMT
TaskTracker Out of Memory because of distributed cache
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                 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


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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