[IMPALA-11863] Enhance the support of trivial query admission

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Backend
• Labels: admission-control
• Epic Color: ghx-label-8
• Assignee: Unassigned
• Reporter: Yida Wu
• Created: 25/Jan/23 05:51
• Updated: 25/Jan/23 05:51

Description

As in IMPALA-7969, a query which meets the requirement of a trivial query, like "select 1", could be admitted immediately to bypass the admission controller.

This task is to extend this functionality for a query when it is considered small enough to bypass the admission controller and execute in the coordinator without waiting to start a new executor when there is no available executor in the current executor group.

The definition of the extended trivial query is to be discussed.