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From AJ ...@dude.podzone.net>
Subject Re: Docs: Token Selection
Date Fri, 17 Jun 2011 18:01:55 GMT
Hi Jeremiah, can you give more details?

Thanks

On 6/17/2011 10:49 AM, Jeremiah Jordan wrote:
> Run two Cassandra clusters...
>
> -----Original Message-----
> From: Eric tamme [mailto:etamme@gmail.com]
> Sent: Friday, June 17, 2011 11:31 AM
> To: user@cassandra.apache.org
> Subject: Re: Docs: Token Selection
>
>> What I don't like about NTS is I would have to have more replicas than
>> I need.  {DC1=2, DC2=2}, RF=4 would be the minimum.  If I felt that 2
>> local replicas was insufficient, I'd have to move up to RF=6 which
>> seems like a waste... I'm predicting data in the TB range so I'm
>> trying to keep replicas to a minimum.
>>
>> My goal is to have 2-3 replicas in a local data center and 1 replica
>> in another dc.  I think that would be enough barring a major
>> catastrophe.  But, I'm not sure this is possible.  I define "local" as
>> in the same data center as the client doing the insert/update.
> Yes, not being able to configure the replication factor differently for each data center
is a bit annoying.  Im assuming you basically want DC1 to have a replication factor of {DC1:2,
DC2:1} and DC2 to have {DC1:1,DC2:2}.
>
> I would very much like that feature as well, but I dont know the feasibility of it.
>
> -Eric
>


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