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https://issues.apache.org/jira/browse/SPARK-42227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17687889#comment-17687889
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xuanzhiang commented on SPARK-42227:
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spark version : 3.2.1
hadoop version : 3.0.0
job info:
!percentile_approx objectHashAggregateExec.png!
shuffle read task info :
!percentile_approx objectHashAggregateExec_shuffle_task.png!
> Use approx_percentile function running slower in spark3 than spark2
> -------------------------------------------------------------------
>
> Key: SPARK-42227
> URL: https://issues.apache.org/jira/browse/SPARK-42227
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.2.1
> Reporter: xuanzhiang
> Priority: Major
> Attachments: percentile+objectHashAggregateExec.png,
> percentile+objectHashAggregateExec_shuffle_task.png,
> percentile_approx+objectHashAggregateExec.png,
> percentile_approx+objectHashAggregateExec_shuffle_task.png
>
>
> approx_percentile(end_ts-start_ts,0.9) cost_p90
> in spark3 , it use objectHashAggregate method , but it shuffle very slow.
> when i use percentile , it become fast. i dont know the reson, i think
> approx_percentile should fast.
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