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From: David Laube <dave@stormpath.com>
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Subject: Cassandra JVM heap sizes on EC2
Message-Id: <112276F9-454B-4F7E-8EF7-BF7E128B70A4@stormpath.com>
Date: Fri, 23 Aug 2013 15:12:14 -0700
To: user@cassandra.apache.org
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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 =
http://www.datastax.com/documentation/cassandra/1.2/mobile/cassandra/opera=
tions/ops_tune_jvm_c.html 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.

Thanks,
-David Laube


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi =
All,<div><br></div><div>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.&nbsp;I've already consulted the docs at&nbsp;<a =
href=3D"http://www.datastax.com/documentation/cassandra/1.2/mobile/cassand=
ra/operations/ops_tune_jvm_c.html" style=3D"font-size: 12px; =
">http://www.datastax.com/documentation/cassandra/1.2/mobile/cassandra/ope=
rations/ops_tune_jvm_c.html</a>&nbsp;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.</div><div><br></div><div>Thanks,</div><div>-David =
Laube</div><div><br></div></body></html>=

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