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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:
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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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