[HIVE-22725] Lazy evaluate HiveMetastore::fireReadTablePreEvent table computation

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Assignee: Rajesh Balamohan
• Reporter: Rajesh Balamohan
• Created: 14/Jan/20 06:40
• Updated: 17/Nov/22 08:51
• Resolved: 17/Jan/20 22:41

Description

"TransactionalValidationListener" gets added in the pre-event listeners of HMS by default.

https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java#L559

This causes issue in short select queries, as table details are computed for any partition lookups.

https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java#L4984

 

 

It would be good to lazy evaluate table lookup in this codepath.