No, that's not what I mean at all. That message is about the ability to use different partitioners for different CFs, say, RandomPartitioner for one, OPP for another.
I'm talking about defining how many nodes a CF should be distributed over, which would be useful if you have a lot of nodes and a lot of small CFs (small relative to the total amount of data). On Mon, Feb 21, 2011 at 9:58 PM, Aaron Morton <aa...@thelastpickle.com>wrote: > 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. > > >
