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https://issues.apache.org/jira/browse/SPARK-35961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-35961.
---------------------------------
Fix Version/s: 3.2.0
Resolution: Fixed
Issue resolved by pull request 33165
[https://github.com/apache/spark/pull/33165]
> Only use local shuffle reader when REBALANCE_PARTITIONS_BY_NONE without
> CustomShuffleReaderExec
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-35961
> URL: https://issues.apache.org/jira/browse/SPARK-35961
> 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
>
>
> After [SPARK-35725](https://issues.apache.org/jira/browse/SPARK-35725), we
> might expand partition if that partition is skewed. So the partition number
> check `bytesByPartitionId.length == partitionSpecs.size` would be wrong if
> some partitions are coalesced and some partitions are splitted into smaller.
> Note that, it's unlikely happened in real world since it used RoundRobin.
> Otherhand, after
> [SPARK-34899](https://issues.apache.org/jira/browse/SPARK-34899), we use
> origin plan if can not coalesce partitions. So the assuming of that shuffle
> stage has `CustomShuffleReaderExec` with no effect is always false in
> `REBALANCE_PARTITIONS_BY_NONE` shuffle origin. That said, if no rule was
> efficient, there would be no `CustomShuffleReaderExec`.
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