> With N nodes, the ring is divided into N*num_tokens. Correct? There is always num_tokens tokens in the ring. Each node has (num_tokens / N) * RF ranges on it.
> so the ranges of keys are not uniform, although with enough nodes in the > cluster there probably won't be any really large ranges. Correct? Even without vnodes there is no guarantee that nodes had contiguous key ranges. Cheers ----------------- Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com On 6/02/2013, at 5:43 AM, Baron Schwartz <ba...@xaprb.com> wrote: > As I understand the num_tokens setting, it makes Cassandra do the following > pseudocode when a new node is added: > > for 1...num_tokens do > my_token = rand(0, 2^128-1) > next_token = min(tokens in cluster where token > my_token) > my_range = (my_token, next_token - 1) > done > > Now the new node owns num_tokens chunks of keys that previously belonged to > other nodes. > > My point is, with 1 node in the cluster, the ring is divided into num_tokens > ranges. With N nodes, the ring is divided into N*num_tokens. Correct? The > docs do not make this clear for me. > > And another point: the tokens are randomly chosen, so the ranges of keys are > not uniform, although with enough nodes in the cluster there probably won't > be any really large ranges. Correct?
