[jira] [Commented] (SPARK-35725) Support repartition expand partitions in AQE

["Penglei Shi (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-35725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17682455#comment-17682455 ] 

Penglei Shi commented on SPARK-35725:
-------------------------------------

Hi [~ulysses]  , advisory partition size for shuffle will be used for splitting skew partitions at present, which is default 64MB. Usually we prefer a samll value such as 32/64mb for bertter performance for intermediate shuffle. But in last shuffle which is come with Rebalance, we prefer a large value such as 128/256mb so that the written files are in appropriate size. So i think we need another target size to split skew partitions in Rebalance, what's your suggestion?

> Support repartition expand partitions in AQE
> --------------------------------------------
>
>                 Key: SPARK-35725
>                 URL: https://issues.apache.org/jira/browse/SPARK-35725
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: XiDuo You
>            Assignee: XiDuo You
>            Priority: Major
>             Fix For: 3.2.0
>
>
> Currently, we don't support expand partition dynamically in AQE which is not friendly for some data skew job.
> Let's say if we have a simple query:
> {code:java}
> SELECT * FROM table DISTRIBUTE BY col
> {code}
> The column of `col` is skewed, then some shuffle partitions would handle too much data than others.
> If we haven't inroduced extra shuffle, we can optimize this case by expanding partitions in AQE.



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