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https://issues.apache.org/jira/browse/SPARK-36967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wan Kun updated SPARK-36967:
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Attachment: map_status2.png
> Update accurate block size threshold per reduce task
> ----------------------------------------------------
>
> Key: SPARK-36967
> URL: https://issues.apache.org/jira/browse/SPARK-36967
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.3.0
> Reporter: Wan Kun
> Priority: Major
> Attachments: map_status.png, map_status2.png
>
>
> Now map task will report accurate shuffle block size if the block size is
> greater than "spark.shuffle.accurateBlockThreshold"( 100M by default ). But
> if there are many map tasks and shuffle block sizes of these tasks are less
> than "spark.shuffle.accurateBlockThreshold", there may be data skew, but not
> recognized.
> For example, there are 10000 map task and 10000 reduce task, and each task
> has 50M for reduce 0, and 10K for the left reduce tasks, reduce 0 is data
> skew, but the stat of this plan do not have this message.
> !map_status.png!
> I think we need to judge if a shuffle block is huge and need to be accurate
> reported while running.
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