"Additional keyspaces have very little overhead (unlike CFs)."
On Fri, Aug 6, 2010 at 9:42 AM, Zhong Li <z...@voxeo.com> wrote: > > If I create 3-4 keyspaces, will this impact performance and resources (esp. > memory and disk I/O) too much? > > Thanks, > > Zhong > > On Aug 5, 2010, at 4:52 PM, Benjamin Black wrote: > >> On Thu, Aug 5, 2010 at 12:59 PM, Zhong Li <z...@voxeo.com> wrote: >>> >>> The big thing bother me is initial ring token. We have some Column >>> Families. >>> It is very hard to choose one token suitable for all CFs. Also some >>> Column >>> Families need higher Consistent Level and some don't. If we set >> >> Consistency Level is set by clients, per request. If you require >> different _Replication Factors_ for different CFs, then just put them >> in different keyspaces. Additional keyspaces have very little >> overhead (unlike CFs). >> >>> ReplicationFactor too high, it is too costy for crossing datacenter, >>> especially in otherside the world. >>> >>> I know we can setup multiple rings, but it costs more hardware. >>> >>> if Cassandra can implement Ring,Token and RF on the CF level, or even >>> SuperColumn level, it will make design much easier and more efficiency. >>> >>> Is it possible? >>> >> >> The approach I described above is what you can do. The rest of what >> you asked is not happening. >> >> >> >> b > >
