[CASSANDRA-9739] Migrate counter-cache to be fully off-heap

• Type: Sub-task
• Status: Resolved
• Priority: Normal
• Resolution: Won't Fix
• Fix Version/s: 4.1-alpha1, 4.1
• Component/s: Legacy/Core
• Assignee: Robert Stupp
• Reporter: Robert Stupp

Authors

Robert Stupp

• Created: 06/Jul/15 16:54
• Updated: 16/Dec/22 21:56
• Resolved: 07/Jul/20 06:28

Description

Counter cache still uses a concurrent map on-heap. This could go to off-heap and feels doable now after CASSANDRA-8099.

Evaluation should be done in advance based on a POC to prove that pure off-heap counter cache buys a performance and/or gc-pressure improvement.

In theory, elimination of on-heap management of the map should buy us some benefit.

Issue Links

• blocks: CASSANDRA-9929 More efficient memory handling for tiny off-heap cache entries
• links to: Git branch