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https://issues.apache.org/jira/browse/HIVE-23391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Chovan updated HIVE-23391:
---------------------------------
    Status: Open  (was: Patch Available)

> Change requested lock for ALTER TABLE ADD COLUMN to DDL_SHARED
> --------------------------------------------------------------
>
>                 Key: HIVE-23391
>                 URL: https://issues.apache.org/jira/browse/HIVE-23391
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Zoltan Chovan
>            Assignee: Zoltan Chovan
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: HIVE-23391.2.patch, HIVE-23391.3.patch, 
> HIVE-23391.4.patch, HIVE-23391.patch
>
>
> A long running query can block a simple add column query, as the add column 
> will require a DDL_EXCLUSIVE lock currently. By changing this to a shared 
> lock, this metadata only query can be executed without having to wait for the 
> previous query to finish.



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