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From David Laube <>
Subject Cassandra JVM heap sizes on EC2
Date Fri, 23 Aug 2013 22:12:14 GMT
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
but 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.

-David Laube

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