Chris Burroughs created CASSANDRA-6591:
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Summary: un-deprecate cache recentHitRate and expose in
o.a.c.metrics
Key: CASSANDRA-6591
URL: https://issues.apache.org/jira/browse/CASSANDRA-6591
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Chris Burroughs
Priority: Minor
recentHitRate metrics were not added as part of CASSANDRA-4009 because there is
not an obvious way to do it with the Metrics library. Instead hitRate was
added as an all time measurement since node restart.
This does allow changes in cache rate (aka production performance problems) to
be detected. Ideally there would be 1/5/15 moving averages for the hit rate,
but I'm not sure how to calculate that. Instead I propose updating
recentHitRate on a fixed interval and exposing that as a Gauge.
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