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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2740

MultipleOutputs in new API creates needless TaskAttemptContexts

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.23.0
    • Fix Version/s: 0.23.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      MultipleOutputs.write creates a new TaskAttemptContext, which we've seen to take a significant amount of CPU. The TaskAttemptContext constructor creates a JobConf, gets current UGI, etc. I don't see any reason it needs to do this, instead of just creating a single TaskAttemptContext when the InputFormat is created (or lazily but cached as a member)

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        1. mr-2740.txt
          2 kB
          Todd Lipcon

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              • Assignee:
                tlipcon Todd Lipcon
                Reporter:
                tlipcon Todd Lipcon
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                • Created:
                  Updated:
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