Uploaded image for project: 'Spark'
  1. Spark
  2. SPARK-772

groupByKey should disable map side combine

    XMLWordPrintableJSON

Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 0.8.0
    • None
    • None

    Description

      Map side combine in group by key case does not reduce the amount of data shuffled. Instead, it forces a lot more objects to go into old gen, and leads to worse GC.

      Attachments

        Issue Links

          is related to

          Improvement - An improvement or enhancement to an existing feature or task. SPARK-774 cogroup should also disable map side combine by default

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. SPARK-31948 expose mapSideCombine in aggByKey/reduceByKey/foldByKey

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Activity

            People

              rxin Reynold Xin
              rxin Reynold Xin
              Votes:
              0 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: