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Posted to issues@spark.apache.org by "wang-zhun (Jira)" <ji...@apache.org> on 2022/07/29 06:58:00 UTC
[jira] [Updated] (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 ]
wang-zhun updated SPARK-39921:
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> 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
> Priority: Major
> Fix For: 3.1.2, 3.3.0
>
> 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
> !https://git.n.xiaomi.com/computing/spark/uploads/ee0bf49e1c2a378592c6885c1a37a14c/image.png!
> h3. !image-2022-07-29-14-52-10-659.png!
> h3. Effect
> !image-2022-07-29-14-53-27-021.png!
> !image-2022-07-29-14-52-58-810.png!
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