I want tow separate clusters. *Tamar Fraenkel * Senior Software Engineer, TOK Media
[image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Mon, Mar 5, 2012 at 12:48 PM, aaron morton <aa...@thelastpickle.com>wrote: > Do you want to create two separate clusters or a single cluster with two > data centres ? > > If it's the later, token selection is discussed here > http://www.datastax.com/docs/1.0/install/cluster_init#token-gen-cassandra > > > Moreover all tokens must be unique (even across datacenters), although - > from pure curiosity - I wonder what is the rationale behind this. > > Otherwise data is not evenly distributed. > > By the way, can someone enlighten me about the first line in the output of > the nodetool. Obviously it contains a token, but nothing else. It seems > like a formatting glitch, but maybe it has a role. > > It's the exclusive lower bound token for the first node in the ring. This > also happens to be the token for the last node in the ring. > > In your setup > 10.0.0.19 "owns" (85070591730234615865843651857942052864+1) to 0 > 10.0.0.28 "owns" (0 + 1) to 85070591730234615865843651857942052864 > > (does not imply primary replica, just used to map keys to nodes.) > > > > ----------------- > Aaron Morton > Freelance Developer > @aaronmorton > http://www.thelastpickle.com > > On 5/03/2012, at 11:38 PM, Hontvári József Levente wrote: > > You have to use PropertyFileSnitch and NetworkTopologyStrategy to create > a multi-datacenter setup with two circles. You can start reading from this > page: > > http://www.datastax.com/docs/1.0/cluster_architecture/replication#about-replica-placement-strategy > > Moreover all tokens must be unique (even across datacenters), although - > from pure curiosity - I wonder what is the rationale behind this. > > By the way, can someone enlighten me about the first line in the output of > the nodetool. Obviously it contains a token, but nothing else. It seems > like a formatting glitch, but maybe it has a role. > > On 2012.03.05. 11:06, Tamar Fraenkel wrote: > > Hi! > I have a Cassandra cluster with two nodes > > nodetool ring -h localhost > Address DC Rack Status State Load > Owns Token > > 85070591730234615865843651857942052864 > 10.0.0.19 datacenter1 rack1 Up Normal 488.74 KB > 50.00% 0 > 10.0.0.28 datacenter1 rack1 Up Normal 504.63 KB > 50.00% 85070591730234615865843651857942052864 > > I want to create a second ring with the same name but two different > nodes. > using tokengentool I get the same tokens as they are affected from the > number of nodes in a ring. > > My question is like this: > Lets say I create two new VMs, with IPs: 10.0.0.31 and 10.0.0.11 > *In 10.0.0.31 cassandra.yaml I will set* > initial_token: 0 > seeds: "10.0.0.31" > listen_address: 10.0.0.31 > rpc_address: 0.0.0.0 > > *In 10.0.0.11 cassandra.yaml I will set* > initial_token: 85070591730234615865843651857942052864 > seeds: "10.0.0.31" > listen_address: 10.0.0.11 > rpc_address: 0.0.0.0 > > *Would the rings be separate?* > > Thanks, > > *Tamar Fraenkel * > Senior Software Engineer, TOK Media > > <Mail Attachment.png> > > > ta...@tok-media.com > Tel: +972 2 6409736 > Mob: +972 54 8356490 > Fax: +972 2 5612956 > > > > > >
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