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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2014/05/19 21:14:39 UTC
[jira] [Updated] (CASSANDRA-6591) un-deprecate cache recentHitRate
and expose in o.a.c.metrics
[ https://issues.apache.org/jira/browse/CASSANDRA-6591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-6591:
--------------------------------------
Reviewer: Benedict (was: Yuki Morishita)
Reassigning review to [~benedict]. Larger conversation around what to do w/ custom EH metrics vs coda?
> 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
> Assignee: Chris Burroughs
> Priority: Minor
> Attachments: j6591-1.2-v1.txt, j6591-1.2-v2.txt, j6591-1.2-v3.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 Gauge.
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