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https://issues.apache.org/jira/browse/SPARK-21343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078912#comment-16078912
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Apache Spark commented on SPARK-21343:
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User 'jinxing64' has created a pull request for this issue:
https://github.com/apache/spark/pull/18566

> Refine the document for spark.reducer.maxReqSizeShuffleToMem
> ------------------------------------------------------------
>
>                 Key: SPARK-21343
>                 URL: https://issues.apache.org/jira/browse/SPARK-21343
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.1.1
>            Reporter: jin xing
>
> In current code, reducer can break the old shuffle service when 
> {{spark.reducer.maxReqSizeShuffleToMem}} is enabled. Let's refine document.



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