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From Jason Dixon <>
Subject Re: munin is great for monitoring Cassandra
Date Thu, 17 Jun 2010 20:55:27 GMT
On Thu, Jun 17, 2010 at 04:01:41PM -0400, Mike Subelsky wrote:
> I just started munin to monitor the performance of my cluster which is
> working great.  I noticed the attached pattern for JVM heap size -
> lots of peaks and valleys, which looks like GC is firing pretty
> frequently.  I don't have a lot of experience with Java apps, and our
> installation is relatively untuned (3 large EC2 instances each with 5G
> heap memory with the commit log on an ephemeral drive and the data
> drive on an EBS volume).  Does that pattern look bad or is it
> relatively normal? If it's not normal, any advice for what I should
> change to get better performance?
> Big thanks to Jonathan and James for building these awesome plugins.
> As a JMX novice this was a huge boost:

P.S. Big props to Adam Jacob @ Opscode for creating the Circonus-munin
bridge.  It's quite a bit of fun importing all of my munin metrics into
Circonus.  :)

Jason Dixon
OmniTI Computer Consulting, Inc.
443.325.1357 x.241

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