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Posted to issues@spark.apache.org by "Josh Rosen (JIRA)" <ji...@apache.org> on 2015/08/26 23:38:45 UTC

[jira] [Created] (SPARK-10303) Spark SQL JSON Reader uses inefficient form of Union operation

Josh Rosen created SPARK-10303:
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             Summary: Spark SQL JSON Reader uses inefficient form of Union operation
                 Key: SPARK-10303
                 URL: https://issues.apache.org/jira/browse/SPARK-10303
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.5.0
            Reporter: Josh Rosen
         Attachments: screenshot-1.png

See attached screenshot.  For a job that uses SQLContext's JSON reader, the RDD DAG visualization shows that Spark is using an inefficient version of Union which chains together many UnionRDDs as opposed to the more-efficient form of UnionRDD that accepts a larger list of child RDDs.





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