Hello, Me and some of my colleagues are about to start some experiments running Cassandra across EC2 regions using virtual networks and have some questions about how this is going to work.
I've read these threads about patching the .yaml file to bind to the Listen address to the public IP... http://mail-archives.apache.org/mod_mbox/cassandra-user/201104.mbox/%3CBANLkTikWGOtWkBOBAs+ibq5voSmjLm=gQQ@mail.gmail.<http://mail-archives.apache.org/mod_mbox/cassandra-user/201104.mbox/%3CBANLkTikWGOtWkBOBAs+ibq5voSmjLm=g...@mail.gmail.com%3E> com%3E<http://mail-archives.apache.org/mod_mbox/cassandra-user/201104.mbox/%3CBANLkTikWGOtWkBOBAs+ibq5voSmjLm=g...@mail.gmail.com%3E> http://mail-archives.apache.org/mod_mbox/cassandra-user/201103.mbox/%3CAANLkTikWsuUOjEU228niWi0iDTAO5J=5wO=i=hg33...@mail.gmail.com%3E And this EC2 Snitch patch that lets it work across regions... https://issues.apache.org/jira/browse/CASSANDRA-2452 I'm pretty familiar with EC2 networking, but not very familiar how Cassandra will use the RPC and Listen ports with this Snitch. So, my question is: If we use the EC2 Snitch patch to set up across regions, will the instance's private IP/interface *ever* be used? Or will all traffic always go in and out of the public interface?? Using the public interface is slower and more expensive that the private interface. What I'm trying to do is set up a virtual network that lets all the nodes use private IPs, but can still communicate across regions. We're going to try this with a virtual network as well as with the EC2 Snitch to see how things compare. Being able to use the EC2 private interface is going to make big difference. Thanks in advance. CM
