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https://issues.apache.org/jira/browse/SPARK-2680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14074972#comment-14074972
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Apache Spark commented on SPARK-2680:
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User 'mateiz' has created a pull request for this issue:
https://github.com/apache/spark/pull/1593
> Lower spark.shuffle.memoryFraction to 0.2 by default
> ----------------------------------------------------
>
> Key: SPARK-2680
> URL: https://issues.apache.org/jira/browse/SPARK-2680
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Matei Zaharia
> Priority: Minor
> Fix For: 1.1.0
>
>
> Seems like it's good to be more conservative on this, in particular to try to
> fit all the data in the young gen. People can always increase it for
> performance.
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