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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/09/28 22:53:00 UTC

[jira] [Commented] (SPARK-22160) Allow changing sample points per partition in range shuffle exchange

    [ https://issues.apache.org/jira/browse/SPARK-22160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16185051#comment-16185051 ] 

Apache Spark commented on SPARK-22160:
--------------------------------------

User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/19387

> Allow changing sample points per partition in range shuffle exchange
> --------------------------------------------------------------------
>
>                 Key: SPARK-22160
>                 URL: https://issues.apache.org/jira/browse/SPARK-22160
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>
> Spark's RangePartitioner hard codes the number of sampling points per partition to be 20. This is sometimes too low. This ticket makes it configurable, via spark.sql.execution.rangeExchange.sampleSizePerPartition, and raises the default in Spark SQL to be 100.



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