Hi, we did this exact same operation here too, with no issue. Contrary to Paulo we did not modify our snitch.
We simply added a "dc_suffix" in the property in cassandra-rackdc.properties conf file for nodes in the new cluster : # Add a suffix to a datacenter name. Used by the Ec2Snitch and Ec2MultiRegionSnitch # to append a string to the EC2 region name. dc_suffix=-xl So our new cluster DC is basically : eu-west-xl I think this is less risky, at least it is easier to do. Hope this help. 2014-02-02 11:42 GMT+01:00 Paulo Ricardo Motta Gomes < paulo.mo...@chaordicsystems.com>: > We had a similar situation and what we did was first migrate the 1.1 > cluster to GossipingPropertyFileSnitch, making sure that for each node we > specified the correct availability zone as the rack in > the cassandra-rackdc.properties. In this way, > the GossipingPropertyFileSnitch is equivalent to the EC2MultiRegionSnitch, > so the data location does not change and no repair is needed afterwards. > So, if your nodes are located in the us-east-1e AZ, your > cassandra-rackdc.properties > should look like: > > dc=us-east > rack=1e > > After this step is complete on all nodes, then you can add a new > datacenter specifying different dc and rack on the > cassandra-rackdc.properties of the new DC. Make sure you upgrade your > initial datacenter to 1.2 before adding a new datacenter with vnodes > enabled (of course). > > Cheers > > > On Sun, Feb 2, 2014 at 6:37 AM, Katriel Traum <katr...@google.com> wrote: > >> Hello list. >> >> I'm upgrading a 1.1 cassandra cluster to 1.2(.13). >> I've read here and in other places that the best way to migrate to vnodes >> is to add a new DC, with the same amount of nodes, and run rebuild on each >> of them. >> However, I'm faced with the fact that I'm using EC2MultiRegion snitch, >> which automagically creates the DC and RACK. >> >> Any ideas how I can go about adding a new DC with this kind of setup? I >> need these new machines to be in the same EC2 Region as the current ones, >> so adding to a new Region is not an option. >> >> TIA, >> Katriel >> > > > > -- > *Paulo Motta* > > Chaordic | *Platform* > *www.chaordic.com.br <http://www.chaordic.com.br/>* > +55 48 3232.3200 > +55 83 9690-1314 >
