On Thu, Jun 16, 2011 at 11:11 AM, Sasha Dolgy <sdo...@gmail.com> wrote: > So, with ec2 ... 3 regions (DC's), each one is +1 from another....?
I dont use ec2, so I am not familiar with the specifics of deployment there. That said, if you have 3 data centers with equal nodes in each (so that you would calculate the same tokens for each DC) - the first DC you would add 0, the second DC you would add 1, the third DC you would add 2. so it could look like the following In DC 1 node 1 = 0 node 2 = 85070591730234615865843651857942052864 In DC 2 node 1 = 1 node 2 = 85070591730234615865843651857942052865 In DC 3 node 1 = 2 node 2 = 85070591730234615865843651857942052866 Keep in mind, the only reason you need to offset tokens is if there is another node that would have the exact same token. So if you have different numbers of nodes in different data centers, it is possible you wont need any token offsets. Just calculate tokens normally, as if the DC was the only one, then check for any node in another DC with the same token and add +1 to offset the token. -Eric
