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Posted to issues@spark.apache.org by "Tang Yan (JIRA)" <ji...@apache.org> on 2015/05/22 10:45:17 UTC

[jira] [Created] (SPARK-7825) Poor performance in Cross Product due to no combine operations for small files.

Tang Yan created SPARK-7825:
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             Summary: Poor performance in Cross Product due to no combine operations for small files.
                 Key: SPARK-7825
                 URL: https://issues.apache.org/jira/browse/SPARK-7825
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 1.3.1, 1.3.0, 1.2.2, 1.2.1, 1.2.0
            Reporter: Tang Yan


Dealing with  Cross Product, if one  table has many small files, spark sql has to handle so many tasks which will lead to poor performance, while Hive has a CombineHiveInputFormat which can combine small files to decrease the task  number.




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