[ https://issues.apache.org/jira/browse/CASSANDRA-5947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-5947: -------------------------------------- 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira