There is a requirement that all nodes have a unique token. There is
still one global cluster/ring that each node needs to be unique on. The
logically seperate rings that NetworkTopologyStrategy puts them into is
hidden from the rest of the code.
-Jeremiah
On 03/05/2012 05:13 AM, Hontvári József Levente wrote:
I am thinking about the frequent example:
dc1 - node1: 0
dc1 - node2: large...number
dc2 - node1: 1
dc2 - node2: large...number + 1
In theory using the same tokens in dc2 as in dc1 does not
significantly affect key distribution, specifically the two keys on
the border will move to the next one, but that is not much. However it
seems that there is an unexplained requirement (at least I could not
find an explanation), that all nodes must have a unique token, even if
they are put into a different circle by NetworkTopologyStrategy.
On 2012.03.05. 11:48, aaron morton wrote:
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.
