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From Jonathan Ellis <>
Subject Re: munin is great for monitoring Cassandra
Date Thu, 17 Jun 2010 20:52:36 GMT
That looks pretty normal to me.  The JVM doesn't do a full GC until
the old gen crosses a (dynamic, defaults to about 70% of heap)

On Thu, Jun 17, 2010 at 1:01 PM, 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:
> thanks!
> -Mike
> --
> Mike Subelsky
> // //
> @subelsky

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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