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Posted to issues@spark.apache.org by "XiDuo You (Jira)" <ji...@apache.org> on 2021/07/01 03:20:00 UTC
[jira] [Updated] (SPARK-35961) Only use local shuffle reader for
REBALANCE_PARTITIONS_BY_NONE without CustomShuffleReaderExec
[ https://issues.apache.org/jira/browse/SPARK-35961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
XiDuo You updated SPARK-35961:
------------------------------
Parent: SPARK-35793
Issue Type: Sub-task (was: Improvement)
> Only use local shuffle reader for 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
> Priority: Major
>
> 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 (it's unlikely 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. That said, if no rule is efficient, there would be no `CustomShuffleReaderExec`.
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