Sounds a bit like this idea http://www.mail-archive.com/dev@cassandra.apache.org/msg01799.html
Aaron On 22/02/2011, at 1:28 AM, David Boxenhorn <da...@lookin2.com> wrote: > Cassandra is both distributed and replicated. We have Replication Factor but > no Distribution Factor! > > Distribution Factor would define over how many nodes a CF should be > distributed. > > Say you want to support millions of multi-tenant users in clusters with > thousands of nodes, where you don't know the user's schema in advance, so you > can't have users share CFs. > > In this case you wouldn't want to spread out each user's Column Families over > thousands of nodes! You would want something like: RF=3, DF=10 i.e. > distribute each CF over 10 nodes, within those nodes replicate 3 times. > > One implementation of DF would be to hash the CF name, and use the same > strategies defined for RF to choose the N nodes in DF=N. >
