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From Vijay <vijay2...@gmail.com>
Subject Re: Running across multiple EC2 regions...
Date Fri, 29 Jul 2011 22:18:03 GMT
"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. "

If you use 2452, communication within a region is via private ip and
communication between the regions are public (Handshaking or intial
communication will still be via public ip). In EC2 they dont have 2
interface but they nat the public IP.... even then this patch will do the
right thing for you.

There is comments in the patch....


+ * 1) Snitch will automatically set the public IP by querying the AWS API
+ *
+ * 2) Snitch will set the private IP as a Gossip application state.
+ *
+ * 3) Snitch implements IESCS and will reset the connection if it is within the
+ * same region to communicate via private IP.
+ *
+ * Implements Ec2Snitch to inherit its functionality and extend it for
+ * Multi-Region.
+ *
+ * Operational: All the nodes in this cluster needs to be able to (modify the
+ * Security group settings in AWS) communicate via Public IP's.


Regards,
</VJ>



On Fri, Jul 29, 2011 at 2:11 PM, Chris Marino <chris@vsider.com> wrote:

> 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=gQQ@mail.gmail.com%3E>
> com%3E<http://mail-archives.apache.org/mod_mbox/cassandra-user/201104.mbox/%3CBANLkTikWGOtWkBOBAs+ibq5voSmjLm=gQQ@mail.gmail.com%3E>
>
>
> http://mail-archives.apache.org/mod_mbox/cassandra-user/201103.mbox/%3CAANLkTikWsuUOjEU228niWi0iDTAO5J=5wO=i=hG33AnM@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
>
>

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