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  1. Hive
  2. HIVE-3086

Skewed Join Optimization

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Details

    • New Feature
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 0.10.0
    • Query Processor
    • None

    Description

      During a join operation, if one of the columns has a skewed key, it can cause that particular reducer to become the bottleneck. The following feature will address it:
      https://cwiki.apache.org/confluence/display/Hive/Skewed+Join+Optimization

      Attachments

        1. hive.3086.1.patch
          251 kB
          Namit Jain
        2. hive.3086.2.patch
          252 kB
          Namit Jain
        3. hive.3086.3.patch
          338 kB
          Namit Jain
        4. hive.3086.4.patch
          338 kB
          Namit Jain
        5. hive.3086.5.patch
          354 kB
          Namit Jain
        6. hive.3086.6.patch
          355 kB
          Namit Jain

        Issue Links

          breaks

          Bug - A problem which impairs or prevents the functions of the product. HIVE-3507 Some of the tests are not deterministic

          • Major - Major loss of function.
          • Closed
          is depended upon by

          Bug - A problem which impairs or prevents the functions of the product. HIVE-3445 Skewed join optimization for different datatypes

          • Major - Major loss of function.
          • Open

          Activity

            People

              namit Namit Jain
              nadeemoidu Nadeem Moidu
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              Dates

                Created:
                Updated:
                Resolved: