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  1. Hive
  2. HIVE-7292 Hive on Spark
  3. HIVE-8649

Increase level of parallelism in reduce phase [Spark Branch]

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Details

    • Sub-task
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 1.1.0
    • Spark
    • None

    Description

      We calculate the number of reducers based on the same code for MapReduce. However, reducers are vastly cheaper in Spark and it's generally recommended we have many more reducers than in MR.

      Sandy Ryza who works on Spark has some ideas about a heuristic.

      Attachments

        1. HIVE-8649.2-spark.patch
          6 kB
          Jimmy Xiang
        2. HIVE-8649.1-spark.patch
          5 kB
          Jimmy Xiang

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            jxiang Jimmy Xiang Assign to me
            brocknoland Brock Noland
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              Updated:
              Resolved:

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