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Posted to dev@hive.apache.org by "Zoltan Chovan (Jira)" <ji...@apache.org> on 2020/05/07 10:58:00 UTC

[jira] [Created] (HIVE-23391) Change requested lock for ALTER TABLE ADD COLUMN to DDL_SHARED

Zoltan Chovan created HIVE-23391:
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             Summary: 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


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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