Chris Lohfink created CASSANDRA-8331:
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Summary: 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
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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