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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/11/16 07:33:00 UTC
[jira] [Commented] (SPARK-22539) Add second order for
rangepartitioner since partition number may be small if the specified key
is skewed
[ https://issues.apache.org/jira/browse/SPARK-22539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254867#comment-16254867 ]
Apache Spark commented on SPARK-22539:
--------------------------------------
User 'caneGuy' has created a pull request for this issue:
https://github.com/apache/spark/pull/19764
> Add second order for rangepartitioner since partition number may be small if the specified key is skewed
> --------------------------------------------------------------------------------------------------------
>
> Key: SPARK-22539
> URL: https://issues.apache.org/jira/browse/SPARK-22539
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: zhoukang
>
> The rangepartitioner generated from shuffle exchange may cause partiton skew if sort key is skewed.
> We can add second order for rangepartitioner since partition number may be small if the specified key is skewed.
> This improvement comes from real case.
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