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Posted to issues@spark.apache.org by "Yuming Wang (Jira)" <ji...@apache.org> on 2022/10/31 09:15:00 UTC

[jira] [Commented] (SPARK-40972) OptimizeLocalShuffleReader causing data skew

    [ https://issues.apache.org/jira/browse/SPARK-40972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17626490#comment-17626490 ] 

Yuming Wang commented on SPARK-40972:
-------------------------------------

cc [~michaelzhang-db]

> OptimizeLocalShuffleReader causing data skew
> --------------------------------------------
>
>                 Key: SPARK-40972
>                 URL: https://issues.apache.org/jira/browse/SPARK-40972
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Mingming Ge
>            Priority: Major
>         Attachments: image-2022-10-31-15-50-36-435.png, image-2022-10-31-15-51-39-430.png, image-2022-10-31-15-53-19-751.png, image-2022-10-31-15-57-41-599.png
>
>
> Because there are many empty files in the table, the partition num of OptimizeLocalShuffleReader to optimize partition num is 1
> !image-2022-10-31-15-53-19-751.png!
> !image-2022-10-31-15-57-41-599.png!
> !image-2022-10-31-15-50-36-435.png!
>  
>  
> !image-2022-10-31-15-51-39-430.png!



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