[IMPALA-6820] Remove builtins db from catalogd

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 3.0, Impala 2.12.0
• Fix Version/s: Impala 3.0, Impala 2.12.0
• Component/s: Catalog
• Epic Color: ghx-label-5
• Assignee: Tianyi Wang
• Reporter: Tianyi Wang
• Created: 06/Apr/18 19:53
• Updated: 13/Apr/18 02:36
• Resolved: 11/Apr/18 21:03

Description

Currently builtins_db is created in the catalogd initialization. But later on when catalogd calls reset(), catalogd will replace its dbCache with DBs from HMS. As a result, a delete builtins_db operation is always in the initial catalog update sent to statestore. Though statestore doesn't send it to impalad because the initial catalog is not a delta and doesn't include delete operations, it's a potential problem. We should remove builtins db from catalogd because it's not needed there.