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From "Chris Burroughs (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-6591) un-deprecate cache recentHitRate and expose in o.a.c.metrics
Date Mon, 27 Jan 2014 14:01:41 GMT


Chris Burroughs commented on CASSANDRA-6591:

Brendan Gregg's System Performance book has convinced me that cache misses per unit time is
a valuable metric by itself.  Will suck it up and add that as well (which will incidentally
allow 1/5/15, which seemed popular).

> un-deprecate cache recentHitRate and expose in o.a.c.metrics
> ------------------------------------------------------------
>                 Key: CASSANDRA-6591
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Chris Burroughs
>            Assignee: Chris Burroughs
>            Priority: Minor
>         Attachments: j6591-1.2-v1.txt, j6591-1.2-v2.txt
> 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

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