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

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

     [ https://issues.apache.org/jira/browse/SPARK-10303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Rosen deleted SPARK-10303:
-------------------------------


> 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
>            Reporter: Josh Rosen
>
> 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.
> !screenshot-1.png!



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