[IMPALA-10803] Switch default data cache eviction policy to LIRS

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 4.1.0
• Component/s: Backend
• Target Version: Impala 4.3.0
• Epic Color: ghx-label-11
• Assignee: Joe McDonnell
• Reporter: Joe McDonnell
• Created: 16/Jul/21 18:49
• Updated: 20/Dec/22 19:15

Description

The data cache currently defaults to using LRU for the cache eviction policy. In IMPALA-8690, we added support for LIRS, a scan resistant eviction policy. This is now stable, and we should switch to using LIRS by default. It is likely to have better performance characteristics than LRU for most workloads.