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Posted to issues@spark.apache.org by "Saisai Shao (JIRA)" <ji...@apache.org> on 2015/12/18 04:39:46 UTC
[jira] [Commented] (SPARK-12400) Avoid writing a shuffle file if a
partition has no output (empty)
[ https://issues.apache.org/jira/browse/SPARK-12400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063359#comment-15063359 ]
Saisai Shao commented on SPARK-12400:
-------------------------------------
So from my understanding this will only be existed when bypassing to hash style shuffle path?
> 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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