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From Brian Tarbox <>
Subject Re: Cassandra JVM heap sizes on EC2
Date Sat, 24 Aug 2013 01:43:17 GMT
The advice I heard at the New York C* conference...which we follow is to
use the m2.2xlarge and give it about 8 GB.  The m2.4xlarge seems overkill
(or at least over price).


On Fri, Aug 23, 2013 at 6:12 PM, David Laube <> wrote:

> Hi All,
> We are evaluating our JVM heap size configuration on Cassandra 1.2.8 and
> would like to get some feedback from the community as to what the proper
> JVM heap size should be for cassandra nodes deployed on to Amazon EC2. We
> are running m2.4xlarge EC2 instances (64GB RAM, 8 core, 2 x 840GB disks)
> --so we will have plenty of RAM. I've already consulted the docs at
> would love to hear what is working or not working for you in the wild.
> Since Datastax cautions against using more than 8GB, I'm wondering if it is
> even advantageous to use even slightly more.
> Thanks,
> -David Laube

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