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Posted to issues@spark.apache.org by "XiDuo You (Jira)" <ji...@apache.org> on 2022/03/03 12:28:00 UTC

[jira] [Updated] (SPARK-38406) Improve perfermance of ShufflePartitionsUtil createSkewPartitionSpecs

     [ https://issues.apache.org/jira/browse/SPARK-38406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

XiDuo You updated SPARK-38406:
------------------------------
    Description: 
If shuffle is skewed with tens of thousands of map partitions and reduce partitions in AQE, the method `ShufflePartitionsUtil#createSkewPartitionSpecs` will be very slow. More unfortunately, it is running at driver side.

 

  was:
If shuffle is skewed with tens of thousands of map partitions and reduce partitions in AQE, the method `ShufflePartitionsUtil#createSkewPartitionSpecs` will be very slow. More unfortunately, it is running at driver side.

 

See the Flame Graph of my local test env:

!image-2022-03-03-20-24-48-244.png!

We can see, a lot of cpu is running for build seq.

 


> Improve perfermance of ShufflePartitionsUtil createSkewPartitionSpecs
> ---------------------------------------------------------------------
>
>                 Key: SPARK-38406
>                 URL: https://issues.apache.org/jira/browse/SPARK-38406
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: XiDuo You
>            Priority: Major
>
> If shuffle is skewed with tens of thousands of map partitions and reduce partitions in AQE, the method `ShufflePartitionsUtil#createSkewPartitionSpecs` will be very slow. More unfortunately, it is running at driver side.
>  



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