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  1. Hadoop Common
  2. HADOOP-4749

reducer should output input data size when shuffling is done

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.19.0
    • Fix Version/s: 0.20.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      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

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              • Assignee:
                he yongqiang He Yongqiang
                Reporter:
                zshao Zheng Shao
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                • Created:
                  Updated:
                  Resolved: