Thanks everyone for your responses.

On Thu, May 12, 2011 at 1:18 AM, Sylvain Lebresne <> wrote:
On Thu, May 12, 2011 at 1:58 AM, Anurag Gujral <> wrote:
> Hi All,
>              I am testing network topology strategy in cassandra I am using
> two nodes , one node each in different data center.
> Since the nodes are in different dc I assigned token 0 to both the nodes.
> I added both the nodes as seeds in the cassandra.yaml and  I am  using
> properyfilesnitch as endpoint snitch where I have specified the colo
> details.
> I started first node then I when I restarted second node I got an error that
> token "0" is already being used.Why am I getting this error.

You cannot have two nodes with the same token, so you'll have to use "0" and
"1" for instance. It's true that with NTS you have to think of each datacenter
as a separate ring, but there is still this restriction that each token must be
different across the whole cluster.

> Second Question: I already have cassandra running in two different data
> centers I want to add a new keyspace which uses networkTopology strategy
> in the light of above errors how can I accomplish this.
> Thanks
> Anurag