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From "Reynold Xin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-12400) Avoid writing a shuffle file if a partition has no output (empty)
Date Fri, 18 Dec 2015 05:57:46 GMT

    [ https://issues.apache.org/jira/browse/SPARK-12400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063534#comment-15063534
] 

Reynold Xin commented on SPARK-12400:
-------------------------------------

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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