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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