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https://issues.apache.org/jira/browse/SPARK-53942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim resolved SPARK-53942.
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Fix Version/s: 4.1.0
Resolution: Fixed
Issue resolved by pull request 52645
[https://github.com/apache/spark/pull/52645]
> Support changing stateless shuffle partitions upon restart of streaming query
> -----------------------------------------------------------------------------
>
> Key: SPARK-53942
> URL: https://issues.apache.org/jira/browse/SPARK-53942
> Project: Spark
> Issue Type: New Feature
> Components: Structured Streaming
> Affects Versions: 4.1.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> We have been having a huge restriction on the number of shuffle partitions in
> streaming - once the streaming query runs, there is no way but discard the
> checkpoint to change the number of shuffle partitions. There has been
> consistent requests for unblocking this.
> The main reason of the limitation is due to the fact the stateful operator
> has fixed partitions and we should make sure it is unchanged. While the
> invariant is not changed, there is no technical reason to also disallow
> changing of the number of shuffle partitions in stateless shuffle e.g.
> stream-static join, MERGE INTO, etcetc.
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