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