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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] [Updated] (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 updated SPARK-10303:
-------------------------------
Attachment: screenshot-1.png
> 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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