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https://issues.apache.org/jira/browse/SPARK-4845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14246286#comment-14246286
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Apache Spark commented on SPARK-4845:
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User 'scwf' has created a pull request for this issue:
https://github.com/apache/spark/pull/3694
> Adding a parallelismRatio to control the partitions num of shuffledRDD
> ----------------------------------------------------------------------
>
> Key: SPARK-4845
> URL: https://issues.apache.org/jira/browse/SPARK-4845
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.1.0
> Reporter: wangfei
> Fix For: 1.3.0
>
>
> Adding parallelismRatio to control the partitions num of shuffledRDD, the
> rule is:
> Math.max(1, parallelismRatio * number of partitions of the largest upstream
> RDD)
> The ratio is 1.0 by default to make it compatible with the old version. When
> we have a good experience on it, we can change this.
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