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Zoltan Chovan commented on HIVE-23391:
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[~dkuzmenko] could you review this?
> 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.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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