[
https://issues.apache.org/jira/browse/CASSANDRA-5947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ravi Prasad updated CASSANDRA-5947:
-----------------------------------
Attachment: Screen Shot 2013-09-10 at 2.23.11 PM.png
Screenshot of jconsole showing double quoted object names only for
org.apache.cassandra.metrics yammer metrics in cassandra-1.2.10(latest
cassandra-1.2 branch) with metrics-core-2.2.0.jar
> 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
> Fix For: 1.2.10, 2.0.1
>
> Attachments: Screen Shot 2013-09-10 at 2.23.11 PM.png
>
>
> 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
