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https://issues.apache.org/jira/browse/SPARK-51505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-51505.
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Fix Version/s: 4.1.0
Resolution: Fixed
Issue resolved by pull request 50273
[https://github.com/apache/spark/pull/50273]
> Log empty partition number metrics in AQE coalesce
> --------------------------------------------------
>
> Key: SPARK-51505
> URL: https://issues.apache.org/jira/browse/SPARK-51505
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Ziqi Liu
> Assignee: Ziqi Liu
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> There're cases where shuffle is highly skewed and many partitions are
> empty(probably due to small NDV), AQE coalesce metrics might look confusing
> and user might think it wrongly coalesce to large partitions, while the
> actual situation is that a few partitions are super large while others are
> empty.
> We'd better log empty partition number in the metrics.
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