[CASSANDRA-7796] Stop inheriting liveRatio/computedAt from previous memtables

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 2.0.10
• Severity: Low
• Assignee: Aleksey Yeschenko
• Reporter: Aleksey Yeschenko

Authors

Aleksey Yeschenko

Reviewers

Jonathan Ellis

• Created: 19/Aug/14 19:31
• Updated: 16/Apr/19 09:31
• Resolved: 20/Aug/14 13:00

Description

CASSANDRA-6945 helped to reduce the risk of calculating an outlier liveRatio value, and having to stick with it for a long time, by making liveRatio per-memtable and not per-cf.

The added optimization of inheriting liveRatio/calculatedAt to minimize recalculations, however, took us a step back to before CASSANDRA-6945.

I suggest we get rid of inheriting the old values altogether, but reduce the rate of recalculation by demanding 10x increase in ops to trigger recalc, instead of the previous 2x.