Thanks Asher. Yes, I agree. It would be better if someone can help us with clear documentation about this.
As the cross data communication is through private IP, I would consider updating braodcast_address to private IP and use Ec2MultiRegionSnitch. On Tue, Mar 1, 2016 at 3:26 PM, Asher Newcomer <asher...@gmail.com> wrote: > Hi Arun, > > This distinction has been a can of worms for me also - and I'm not sure my > understanding is entirely correct. > > I use GossipingPropertyFileSnitch for my multi-region setup, which seems > to be more flexible than the Ec2 snitches. The Ec2 snitches should work > also, but their behavior is more opaque from my perspective. > > AFAIK - if all of your nodes can reach each other via private IP, and your > anticipated clients can reach all nodes via their private IP, then using > the private IP address as the broadcast_address is fine. > > If there will ever be a situation where a client or node will need to > reach some part of the cluster using public IPs, then public IPs should be > used as the broadcast_address. > > A simple flow-chart / diagram of how these various settings are used by > Cassandra would be very helpful for people new to the project. > > Regards, > > Asher > > On Tue, Mar 1, 2016 at 3:12 PM, Arun Sandu <arunsandu...@gmail.com> wrote: > >> Hi all, >> >> All our nodes are launched in AWS EC2 VPC (private). We have 2 >> datacenters(1 us-east , 1- asiapacific) and all communication is through >> private IP's and don't have any public IPs. What is the recommended snitch >> to be used? We currently have GossipingPropertyFileSnitch. >> >> 1. If Ec2MultiRegionSnitch, then what would be the broadcast_address? >> 2. If not Ec2MultiRegionSnitch, which snitch better fits this environment? >> >> *Ref:* >> As per the document Ec2MultiRegionSnitch >> <http://docs.datastax.com/en/cassandra/2.1/cassandra/architecture/architectureSnitchEC2MultiRegion_c.html>,set >> the listen_address >> <http://docs.datastax.com/en/cassandra/2.1/cassandra/configuration/configCassandra_yaml_r.html#reference_ds_qfg_n1r_1k__listen_address> >> to the *private* IP address of the node, and the broadcast_address >> <http://docs.datastax.com/en/cassandra/2.1/cassandra/configuration/configCassandra_yaml_r.html#reference_ds_qfg_n1r_1k__broadcast_address> >> to the *public* IP address of the node. >> >> -- >> Thanks >> Arun >> > > -- Thanks Arun
