[CASSANDRA-3376] Track buffer cache hit rate with mincore

• Type: New Feature
• Status: Resolved
• Priority: Low
• Resolution: Won't Fix
• Labels: ponies
• Assignee: Unassigned
• Reporter: Jonathan Ellis
• Created: 18/Oct/11 16:43
• Updated: 16/Apr/19 09:32
• Resolved: 22/Oct/13 22:37

Description

We could use mincore on, say, 1% of reads to be able to report actual buffer cache hit rate. This would be useful when troubleshooting slow reads, e.g., are reads to CF X slow because it's hitting disk, or because there are a lot of tombstones in the row?