I'm not sure if it's doable, but I can tell you for sure that there are lots differences in the way the networks will need to be set up. If you've got to secure client traffic, it's going to get even more complicated with encrypted traffic, etc.
We did some performance testing and configuration testing with Cassandra across regions using a virtual network (my company's product).
Have a look at what we did. I think when you add in your own datacenter, things are going to get even more complicated. One of the nice things about using a virtual network in EC2 is that you can set up multiple network interfaces so you don't have to use the the multi-region snitch. These interfaces are also clever about using the real and the NAT'ed EC2 interfaces for cluster traffic (better performance and $0 EC2 data bandwidth costs), so things can be set up just like in your own datacetner without worrying about EC2's public/private IPs, NATing, etc.
You can read about what we did on our blog.
Let me know if you have any questions.
On Mon, Jun 4, 2012 at 3:27 PM, Patrick Lu <firstname.lastname@example.org>
Does anyone have experience on Cassandra deployment mixing with EC2 and own
We plan to use ec2multiregionsnitch to build a Cassandra cluster across EC2
regions, and the same time to have a couple nodes (in the cluster) sitting in
our own data center.
Any comment whether it’s doable?