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https://issues.apache.org/jira/browse/SPARK-23405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362126#comment-16362126
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Sean Owen commented on SPARK-23405:
-----------------------------------

There's just not enough info here to even establish something 'hung' vs 'is 
taking a long time'. This isn't reproducible and there's not much context about 
your data. It is, however, huge. This isn't useful as a JIRA.

> The task will hang up when a small table left semi join a big table
> -------------------------------------------------------------------
>
>                 Key: SPARK-23405
>                 URL: https://issues.apache.org/jira/browse/SPARK-23405
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.1
>            Reporter: KaiXinXIaoLei
>            Priority: Major
>         Attachments: SQL.png, taskhang up.png
>
>
> I run a sql: `select ls.cs_order_number from ls left semi join catalog_sales 
> cs on ls.cs_order_number = cs.cs_order_number`, The `ls` table is a small 
> table ,and the number is one. The `catalog_sales` table is a big table,  and 
> the number is 10 billion. The task will be hang up:
> !taskhang up.png!
>  And the sql page is :
> !SQL.png!



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