[IMPALA-13201] Queries Against System Tables Must Not Be Subject to Admission Control

• Type: Improvement
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Component/s: Backend
• Labels: workload-management
• Epic Link: Workload Management
• Epic Color: ghx-label-6
• Assignee: Jason Fehr
• Reporter: Jason Fehr
• Created: 08/Jul/24 16:32
• Updated: 24/Oct/24 21:22

Description

Impala system tables are in-memory coordinator-only virtual tables without any backing of data on disk. Currently, the only system table is sys.impala_query_live. Since these tables only exist in coordinator memory, queries that only select from these tables do not need to by subject to admission control.

Modify Impala so that queries that only reference system tables are not subject to admission control and can run if there is enough available memory on the coordinator.

Issue Links

• is caused by: IMPALA-12540 SQL Interface to Running Queries/DDLs/DMLs