[jira] [Resolved] (SPARK-38410) Support specify initial partition number for rebalance

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-38410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-38410.
---------------------------------
    Fix Version/s: 3.3.0
       Resolution: Fixed

Issue resolved by pull request 35729
[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
>             Fix For: 3.3.0
>
>
> 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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