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Posted to issues@spark.apache.org by "Yin Huai (JIRA)" <ji...@apache.org> on 2015/08/12 06:39:47 UTC

[jira] [Created] (SPARK-9862) Join: Handling data skew

Yin Huai created SPARK-9862:
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             Summary: Join: Handling data skew
                 Key: SPARK-9862
                 URL: https://issues.apache.org/jira/browse/SPARK-9862
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
            Reporter: Yin Huai
            Assignee: Yin Huai


For a two way shuffle join, if one or multiple groups are skewed in one table (say left table) but having a relative small number of rows in another table (say right table), we can use broadcast join for these skewed groups and use shuffle join for other groups.



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