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Posted to mapreduce-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2013/09/03 23:51:52 UTC

[jira] [Created] (MAPREDUCE-5493) In-memory map outputs can be leaked after shuffle completes

Jason Lowe created MAPREDUCE-5493:
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             Summary: In-memory map outputs can be leaked after shuffle completes
                 Key: MAPREDUCE-5493
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5493
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.9, 2.1.0-beta
            Reporter: Jason Lowe


MergeManagerImpl#close adds the contents of inMemoryMergedMapOutputs and inMemoryMapOutputs to a list of map outputs that is subsequently processed, but it does not clear those sets.  This prevents some of the map outputs from being garbage collected and significantly reduces the memory available for the subsequent reduce phase.

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