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Posted to mapreduce-dev@hadoop.apache.org by "Ahmed Radwan (Created) (JIRA)" <ji...@apache.org> on 2011/11/04 00:43:34 UTC

[jira] [Created] (MAPREDUCE-3343) TaskTracker Out of Memory because of distributed cache

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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