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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/08/04 11:27:00 UTC

[jira] [Assigned] (SPARK-39921) SkewJoin--Stream side skew in BroadcastJoin

     [ https://issues.apache.org/jira/browse/SPARK-39921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-39921:
------------------------------------

    Assignee: Apache Spark

> SkewJoin--Stream side skew in BroadcastJoin
> -------------------------------------------
>
>                 Key: SPARK-39921
>                 URL: https://issues.apache.org/jira/browse/SPARK-39921
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.2
>            Reporter: wang-zhun
>            Assignee: Apache Spark
>            Priority: Major
>         Attachments: 1.png, 2.png, 3.png, 4.png
>
>
> There is data skew in BroadcastJoin. Since LocalShuffle cannot cover all cases, we can refer to the solution of SortMergeJoin skew to consider solving the data skew problem in BroadcastJoin.
> h3. senairo
> !1.png!
> !2.png!
> h3. Effect
> !4.png!
> !3.png!



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