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Posted to issues@spark.apache.org by "Jungtaek Lim (Jira)" <ji...@apache.org> on 2022/02/17 11:06:00 UTC

[jira] (SPARK-38237) Rename back StatefulOpClusteredDistribution to HashClusteredDistribution

    [ https://issues.apache.org/jira/browse/SPARK-38237 ]


    Jungtaek Lim deleted comment on SPARK-38237:
    --------------------------------------

was (Author: apachespark):
User 'HeartSaVioR' has created a pull request for this issue:
https://github.com/apache/spark/pull/35551

> Rename back StatefulOpClusteredDistribution to HashClusteredDistribution
> ------------------------------------------------------------------------
>
>                 Key: SPARK-38237
>                 URL: https://issues.apache.org/jira/browse/SPARK-38237
>             Project: Spark
>          Issue Type: Task
>          Components: SQL, Structured Streaming
>    Affects Versions: 3.3.0
>            Reporter: Jungtaek Lim
>            Priority: Major
>
> We still find HashClusteredDistribution be useful for batch query as well. For example, we had a case with lower parallelism than expected due to the fact ClusteredDistribution is used for aggregation which matches with HashPartitioning with sub-key groups (note that the technical parallelism also depends on "cardinality" - picking sub-key groups means having less cardinality).
> We propose to rename back HashClusteredDistribution with retaining NOTE for stateful operator. The distribution should not be still touched anyway due to the requirement of stateful operator, but can be co-used with batch case if needed.



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