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From "Stefan Podkowinski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12312) Restore JVM metric export for metric reporters
Date Thu, 11 Aug 2016 17:50:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417664#comment-15417664
] 

Stefan Podkowinski commented on CASSANDRA-12312:
------------------------------------------------

I find it somehow confusing to see the commits for the code changes in each branch just as
expected, but not for the documentation changes, which are now part of the merge commit. It's
a bit unfortunate that the author information is lost in merge commits, so I'm wondering what
the correct way to contribute patches for the documentation would be to avoid this situation
in the future. 

> Restore JVM metric export for metric reporters
> ----------------------------------------------
>
>                 Key: CASSANDRA-12312
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12312
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Stefan Podkowinski
>            Assignee: Stefan Podkowinski
>              Labels: lhf
>             Fix For: 2.2.8, 3.0.9, 3.9
>
>         Attachments: 12312-2.2.patch, 12312-3.0.patch, 12312-trunk.patch, metrics-jvm-3.1.0.jar.asc
>
>
> JVM instrumentation as part of dropwizard metrics has been moved to a separate {{metrics-jvm}}
artifact in metrics-v3.0. After CASSANDRA-5657, no jvm related metrics will be exported to
any reporter configured via {{metrics-reporter-config}}, as this isn't part of {{metrics-core}}
anymore. As memory and GC stats are essential for monitoring Cassandra, this turns out to
be a blocker for us for upgrading to 2.2.
> I've included a patch that would add the now separate {{metrics-jvm}} package and enables
some of the provided metrics on startup in case a metrics reporter is used ({{-Dcassandra.metricsReporterConfigFile}}).



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