[jira] [Resolved] (SPARK-12400) Avoid writing a shuffle file if a partition has no output (empty)

["Josh Rosen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-12400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Rosen resolved SPARK-12400.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

Issue resolved by pull request 10376
[https://github.com/apache/spark/pull/10376]

> 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
>            Assignee: Saisai Shao
>             Fix For: 2.0.0
>
>
> 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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