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From Zhong Li <>
Subject set ReplicationFactor and Token at Column Family/SuperColumn level.
Date Thu, 05 Aug 2010 19:59:49 GMT

Thanks for Apache Cassandra Project, it is great project.

This is my first time to use it. We install it on 10 nodes and runs  
great. The 10 nodes cross all 5 datacenters around the world.

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 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?



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