Yes... Thats right... If you are trying to say the below... DC1 Node1 Owns 50%
(Ranges 8..4 -> 8..5 & 8..5 -> 0) Node2 Owns 50% (Ranges 0 -> 1 & 1 -> 8..4) DC2 Node1 Owns 50% (Ranges 8..5 -> 0 & 0 -> 1) Node2 Owns 50% (Ranges 1 -> 8..4 & 8..4 -> 8..5) Regards, </VJ> On Tue, Jun 14, 2011 at 3:47 PM, AJ <a...@dude.podzone.net> wrote: > This http://wiki.apache.org/cassandra/Operations#Token_selection says: > > "With NetworkTopologyStrategy, you should calculate the tokens the nodes in > each DC independantly." > > and gives the example: > > DC1 > node 1 = 0 > node 2 = 85070591730234615865843651857942052864 > > DC2 > node 3 = 1 > node 4 = 85070591730234615865843651857942052865 > > > So, according to the above, the token ranges would be (abbreviated nums): > > DC1 > node 1 = 0 Range: (8..4, 16], (0, 0] > node 2 = 8..4 Range: (0, 8..4] > > DC2 > node 3 = 1 Range: (8..5, 16], (0, 1] > node 4 = 8..5 Range: (1, 8..5] > > > If the above is correct, then I would be surprised as this paragraph is the > only place were one would discover this and may be easy to miss... unless > there's a doc buried somewhere in plain view that I missed. > > So, have I interpreted this paragraph correctly? Was this design to help > keep data somewhat localized if that was important, such as a geographically > dispersed DC? > > Thanks! >
