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  1. Hive
  2. HIVE-964

handle skewed keys for a join in a separate job

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 0.6.0
    • Query Processor
    • None
    • Reviewed

    Description

      The skewed keys can be written to a temporary table or file, and a followup conditional task can be used to perform the join on those keys.
      As a first step, JDBM can be used for those keys

      Attachments

        1. hive-964-2009-12-17.txt
          59 kB
          He Yongqiang
        2. hive-964-2009-12-28-2.patch
          621 kB
          He Yongqiang
        3. hive-964-2009-12-29-4.patch
          639 kB
          He Yongqiang
        4. hive-964-2010-01-08.patch
          293 kB
          He Yongqiang
        5. hive-964-2010-01-13-2.patch
          221 kB
          He Yongqiang
        6. hive-964-2010-01-14-3.patch
          2.26 MB
          He Yongqiang
        7. hive-964-2010-01-15-4.patch
          2.24 MB
          He Yongqiang

        Issue Links

          is depended upon by

          Improvement - An improvement or enhancement to an existing feature or task. HIVE-562 join does not work well if there is a very large skew in keys

          • Major - Major loss of function.
          • Open
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. HIVE-10159 HashTableSinkDesc and MapJoinDesc keyTblDesc can be replaced by JoinDesc.keyTableDesc

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

          New Feature - A new feature of the product, which has yet to be developed. HIVE-20222 Enable Skew Join Optimization For Outer Joins

          • Major - Major loss of function.
          • Open

          Activity

            People

              he yongqiang He Yongqiang
              namit Namit Jain
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              Dates

                Created:
                Updated:
                Resolved: