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https://issues.apache.org/jira/browse/SPARK-37357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-37357.
---------------------------------
Fix Version/s: 3.3.0
Resolution: Fixed
Issue resolved by pull request 34634
[https://github.com/apache/spark/pull/34634]
> Add small partition factor for rebalance partitions
> ---------------------------------------------------
>
> Key: SPARK-37357
> URL: https://issues.apache.org/jira/browse/SPARK-37357
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: XiDuo You
> Priority: Major
> Fix For: 3.3.0
>
>
> For example `Rebalance` provide a functionality that split the large reduce
> partition into smalls. However we have seen many SQL produce small files due
> to the last partition.
> Let's say we have one reduce partition and six map partitions and the blocks
> are:
> [10, 10, 10, 10, 10, 10]
> If the target size is 50, we will get two files with 50 and 10. And it will
> get worse if there are thousands of reduce partitions.
> It should be helpful if we can control the min partition size.
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