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From Benjamin>
Subject Re: set ReplicationFactor and Token at Column Family/SuperColumn level.
Date Thu, 05 Aug 2010 20:52:37 GMT
On Thu, Aug 5, 2010 at 12:59 PM, Zhong Li <> 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.


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