[CASSANDRA-9738] Migrate key-cache to be fully off-heap

• Type: Sub-task
• Status: Resolved
• Priority: Normal
• Resolution: Won't Fix
• Assignee: Robert Stupp
• Reporter: Robert Stupp

Authors

Robert Stupp

• Created: 06/Jul/15 16:53
• Updated: 16/Apr/19 09:31
• Resolved: 12/Nov/16 09:47

Description

Key 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

• depends upon: CASSANDRA-11206 Support large partitions on the 3.0 sstable format
• is related to: CASSANDRA-9754 Make index info heap friendly for large CQL partitions
• requires: CASSANDRA-10314 Update index file format
• supercedes: CASSANDRA-10236 Generate legacy sstables