[jira] [Updated] (SPARK-37357) Add small partition factor for rebalance partitions

["XiDuo You (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-37357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

XiDuo You updated SPARK-37357:
------------------------------
    Summary: Add small partition factor for rebalance partitions  (was: Create skew partition specs should respect min partition size)

> 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
>
> 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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