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https://issues.apache.org/jira/browse/SPARK-38410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501149#comment-17501149
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Apache Spark commented on SPARK-38410:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/35729
> Support specify initial partition number for rebalance
> ------------------------------------------------------
>
> Key: SPARK-38410
> URL: https://issues.apache.org/jira/browse/SPARK-38410
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: XiDuo You
> Priority: Major
>
> Rebalance partitions resolve the skew issue during shuffle dataset. It always
> returns an indeterminate partition number so at the beginning we do not pass
> partition as parameter.
>
> However, we find the initial partition number can affect the data compression
> ratio. So it would be better to make the partition number isolation.
>
> Note that, it only affects the initial partition number at map side during
> shuffle.
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