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  1. Hadoop Common
  2. HADOOP-4668

Improve JavaDoc on JobConf.setCombinerClass to better document restrictions on combiners

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 0.20.0
    • documentation
    • None
    • Reviewed

    Description

      It is often not clear to developers that Combiners may be called 0, 1, or many times and that combiners input and output types must be the same and the combiner must not have side effects. Since there isn't a Combiner class, the best place to put this documentation is on JobConf.setCombinerClass.

      Attachments

        1. combiner-doc.patch
          1 kB
          Owen O'Malley
        2. combiner-doc.patch
          2 kB
          Owen O'Malley

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            omalley Owen O'Malley
            omalley Owen O'Malley
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            Dates

              Created:
              Updated:
              Resolved: