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https://issues.apache.org/jira/browse/SPARK-12400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063534#comment-15063534
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Reynold Xin commented on SPARK-12400:
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Please go ahead.
> Avoid writing a shuffle file if a partition has no output (empty)
> -----------------------------------------------------------------
>
> Key: SPARK-12400
> URL: https://issues.apache.org/jira/browse/SPARK-12400
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Reporter: Reynold Xin
>
> A Spark user was asking for automatic setting of # reducers. When I pushed
> for more, it turned out the problem for them is that 200 creates too many
> files, when most partitions are empty.
> It seems like a simple thing we can do is to avoid creating shuffle files if
> a partition is empty.
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