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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2740

MultipleOutputs in new API creates needless TaskAttemptContexts

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.23.0
    • 0.23.0
    • None
    • None
    • 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)

      Attachments

        1. mr-2740.txt
          2 kB
          Todd Lipcon

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-1853 MultipleOutputs does not cache TaskAttemptContext

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              tlipcon Todd Lipcon
              tlipcon Todd Lipcon
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              Dates

                Created:
                Updated:
                Resolved: