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  1. Hadoop Map/Reduce
  2. MAPREDUCE-3952

In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns 0 split.

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.23.3, 2.0.0-alpha
    • Fix Version/s: 2.0.0-alpha, 0.23.7
    • Component/s: mrv2
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      Hive get unexpected result when using MR2(When using MR1, always get expected result).

      In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns 0 split.

      The calling code in Hive, in Hadoop23Shims.java:

      InputSplit[] splits = super.getSplits(job, numSplits);

      this get splits.length == 0.

      In MR1, everything goes fine, the calling code in Hive, in Hadoop20Shims.java:

      CombineFileSplit[] splits = (CombineFileSplit[]) super.getSplits(job, numSplits);

      this get splits.length == 1.

        Attachments

        1. MAPREDUCE-3952.patch
          3 kB
          Bhallamudi Venkata Siva Kamesh
        2. MAPREDUCE-3952-1.patch
          3 kB
          Bhallamudi Venkata Siva Kamesh

          Activity

            People

            • Assignee:
              kam_iitkgp Bhallamudi Venkata Siva Kamesh
              Reporter:
              zhenxiao Zhenxiao Luo
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              Dates

              • Created:
                Updated:
                Resolved: