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Date: Mon, 22 Apr 2013 16:50:02 -0700
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Subject: Re: Ec2Snitch to Ec2MultiRegionSnitch
From: Dane Miller <dane@optimalsocial.com>
To: user@cassandra.apache.org
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On Thu, Apr 18, 2013 at 7:41 AM, Alain RODRIGUEZ <arodrime@gmail.com> wrote:
> I am wondering about the process to grow from one data center to a few of
> them. First thing is we use EC2Snitch for now. So I guess we have to switch
> to Ec2MultiRegionSnitch.
>
> c/ I am using the SimpleStrategy. Is it worth it/mandatory to change this
> strategy when using multiple DC ?

I suggest you thoroughly read the datastax documentation on cassandra
replication.  The change you are planning is big - make sure to try it
in a test environment first.  Also, you might find you don't really
need Cassandra's rack aware feature, and can operate using
(Gossiping)PropertyFileSnitch.  The rack feature is listed as an
"anti-pattern" here:
http://www.datastax.com/docs/1.2/cluster_architecture/anti_patterns

Here are some recent discussions on this list:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/migrating-from-SimpleStrategy-to-NetworkTopologyStrategy-tp7586272.html
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/migrating-from-SimpleStrategy-to-NetworkTopologyStrategy-tp7481090.html

Dane