Re: Docs: Token Selection

[AJ]

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:eta...@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