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  1. Hadoop Common
  2. HADOOP-4749

reducer should output input data size when shuffling is done

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.19.0
    • 0.20.0
    • None
    • None
    • Reviewed
    • Added a new counter REDUCE_INPUT_BYTES.

    Description

      Sometimes we see a single slow reducer because of the load balancing problem. This information will be very useful to understand how imbalanced the load is.

      Should be easy to fix I guess, since reducer should have all information needed at the end of the shuffling phase.

      Attachments

        1. 4749.patch
          2 kB
          He Yongqiang

        Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. HADOOP-4845 Shuffle counter issues

          • Major - Major loss of function.
          • Closed

          Activity

            People

              he yongqiang He Yongqiang
              zshao Zheng Shao
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              Dates

                Created:
                Updated:
                Resolved: