[jira] [Commented] (SPARK-2503) Lower shuffle output buffer (spark.shuffle.file.buffer.kb)

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-2503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085857#comment-14085857 ] 

Apache Spark commented on SPARK-2503:
-------------------------------------

User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/1781

> Lower shuffle output buffer (spark.shuffle.file.buffer.kb)
> ----------------------------------------------------------
>
>                 Key: SPARK-2503
>                 URL: https://issues.apache.org/jira/browse/SPARK-2503
>             Project: Spark
>          Issue Type: Improvement
>          Components: Shuffle, Spark Core
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>              Labels: stability
>
> Each shuffle output stream uses a 100KB buffer. This is simply too large. For 10k reducers, 32 cores, that adds up to 32GB in buffer alone. 
> The change is simple, but we should make sure there isn't much performance regression when lowering the buffer size. 



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