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https://issues.apache.org/jira/browse/CASSANDRA-8331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14215636#comment-14215636
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Chris Lohfink commented on CASSANDRA-8331:
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I will be willing to give a shot at a patch for exposing Sum or adding a meter
to a few choice histograms if its a good idea.
> Expose rate of change of values in histograms
> ---------------------------------------------
>
> Key: CASSANDRA-8331
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8331
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Chris Lohfink
> Priority: Minor
> Labels: metrics
>
> In the Metrics JMX Histograms, Sum has value for systems that want to get
> derivatives of the data to find rates of change. Particularly if the timing
> of collection is not perfect. The meters give some perspective to the rate
> of which things occur but not of the values themselves. This could be opened
> up in metrics but its been shot down:
> https://github.com/dropwizard/metrics/pull/304
> I think theres still value in this. He does have point on distribution of
> data within the period, but in small windows with not very extreme values (ie
> sstables per read per second) I think its moot.
> Alternatively we can provide Meters for each of the histograms to use its
> implementation of a exponentially weighted moving average to get this value.
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