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  1. Hadoop Common
  2. HADOOP-3443

map outputs should not be renamed between partitions

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 0.17.0
    • Fix Version/s: 0.18.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      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-3443-1.patch
          4 kB
          Owen O'Malley
        2. hadoop-3443-1v17.patch
          4 kB
          Chris Douglas

          Activity

            People

            • Assignee:
              owen.omalley Owen O'Malley
              Reporter:
              owen.omalley Owen O'Malley
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              Dates

              • Created:
                Updated:
                Resolved: