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From Zhong Li <...@voxeo.com>
Subject Re: set ReplicationFactor and Token at Column Family/SuperColumn level.
Date Fri, 06 Aug 2010 16:42:27 GMT

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 <zli@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


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