[IMPALA-8998] Admission control accounting for mt_dop

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 3.4.0
• Component/s: Backend
• Epic Color: ghx-label-14
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 02/Oct/19 05:27
• Updated: 22/Apr/24 14:21
• Resolved: 17/Oct/19 00:17

Description

We should account for the degree of parallelism that the query runs with on a backend to avoid overadmitting too many parallel queries.

We could probably simply count the effective degree of parallelism (max # instances of a fragment on that backend) toward the number of slots in admission control (although slots are not enabled for the default group yet - see IMPALA-8757).

Issue Links

• relates to: IMPALA-8757 Extend slot based admission to default executor group