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  1. Hadoop Common
  2. HADOOP-3443

map outputs should not be renamed between partitions

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Details

    • Bug
    • Status: Closed
    • Critical
    • Resolution: Fixed
    • 0.17.0
    • 0.18.0
    • None
    • None
    • Reviewed

    Description

      If a map finishes with out having to spill its data buffer, the map outputs are sorted and written to disk. However, no care is taken to make sure that the same partition is used to write it out before it is renamed. On nodes with multiple disks assigned to the task trackers, this will likely cause an addition read/write cycle to disk that is very expensive.

      Attachments

        1. hadoop-3443-1v17.patch
          4 kB
          Christopher Douglas
        2. hadoop-3443-1.patch
          4 kB
          Owen O'Malley

        Activity

          People

            omalley Owen O'Malley
            omalley Owen O'Malley
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            Dates

              Created:
              Updated:
              Resolved: