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https://issues.apache.org/jira/browse/SPARK-21343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-21343.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0
                   2.2.1

Issue resolved by pull request 18566
[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
>             Fix For: 2.2.1, 2.3.0
>
>
> In current code, reducer can break the old shuffle service when 
> {{spark.reducer.maxReqSizeShuffleToMem}} is enabled. Let's refine document.



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