[IMPALA-12032] PROCESSING_COST_MIN_THREADS fail to cap minimum parallelism

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 4.3.0
• Fix Version/s: Impala 4.3.0
• Component/s: Frontend
• Epic Color: ghx-label-6
• Assignee: Riza Suminto
• Reporter: Riza Suminto
• Created: 29/Mar/23 19:34
• Updated: 11/Apr/23 12:39
• Resolved: 31/Mar/23 01:55

Description

PROCESSING_COST_MIN_THREADS suppose to be a lower bound of per node parallelism when CPU costing algorithm adjust fragment parallelism across executor group set. But PlanFragment.adjustToMaxParallelism() does not take account of it during adjustment.