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https://issues.apache.org/jira/browse/CASSANDRA-5947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-5947:
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Component/s: Tools
Priority: Minor (was: Major)
Assignee: Jonathan Ellis (was: Brandon Williams)
> Sampling bug in metrics-core-2.0.3.jar used by Cassandra
> --------------------------------------------------------
>
> Key: CASSANDRA-5947
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5947
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: J.B. Langston
> Assignee: Jonathan Ellis
> Priority: Minor
>
> There is a sampling bug in the version of the metrics library we're using in
> Cassandra. See https://github.com/codahale/metrics/issues/421.
> ExponentiallyDecayingSample is used by the Timer's histogram that is used in
> stress tool, and according to [~brandon.williams] it is also in a few other
> places like the dynamic snitch. The statistical theory involved in this bug
> goes over my head so i'm not sure if this would bug would meaningfully affect
> its usage by Cassandra. One of the comments on the bug mentions that it
> affects slow sampling rates (10 samples/min was the example given). We're
> currently distributing metrics-core-2.0.3.jar and according to the release
> nodes, this bug is fixed in 2.1.3:
> http://metrics.codahale.com/about/release-notes/#v2-1-3-aug-06-2012
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