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From aaron morton <aa...@thelastpickle.com>
Subject Re: Configuring multi DC cluster
Date Thu, 15 Sep 2011 22:16:23 GMT
Yes my bad.

http://wiki.apache.org/cassandra/Operations#Token_selection

Thanks

-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com

On 16/09/2011, at 6:50 AM, Anand Somani wrote:

> You are right, good catch, thanks!
> 
> On Thu, Sep 15, 2011 at 8:28 AM, Konstantin Naryshkin <konstantinn@a-bb.net> wrote:
> Wait, his nodes are going SC, SC, AT, AT. Shouldn't they go SC, AT, SC, AT? By which
I mean that if he adds another node to the ring (or lowers the replication factor), he will
have a node that is under-utilized. The rings in his data centers have the tokens:
> SC: 0, 1
> AT: 85070591730234615865843651857942052864, 85070591730234615865843651857942052865
> 
> They should be:
> SC: 0, 85070591730234615865843651857942052864
> AT: 1, 85070591730234615865843651857942052865
> 
> Or did I forget/misread something?
> 
> ----- Original Message -----
> From: "aaron morton" <aaron@thelastpickle.com>
> To: user@cassandra.apache.org
> Sent: Tuesday, September 13, 2011 6:19:16 PM
> Subject: Re: Configuring multi DC cluster
> 
> Looks good to me. Last time I checked the Partitioner did not take the DC into consideration
https://issues.apache.org/jira/browse/CASSANDRA-3047
> 
> 
> Good luck.
> 
> 
> 
> 
> 
> 
> 
> -----------------
> Aaron Morton
> Freelance Cassandra Developer
> @aaronmorton
> http://www.thelastpickle.com
> 
> 
> On 14/09/2011, at 8:41 AM, Anand Somani wrote:
> 
> 
> Hi,
> 
> Just trying to setup a cluster of 4 nodes for multiDC scenario - with 2 nodes in each
DC. This is all on the same box just for testing the configuration aspect. I have configured
things as
> 
>    • PropertyFile
> 
> 
>        • 127.0.0.4=SC:rack1 127.0.0.5=SC:rack2 127.0.0.6=AT:rack1 127.0.0.7=AT:rack2
# default for unknown nodes default=SC:rack1
>    •
> Setup initial tokens as - advised     • configured keyspace with SC:2, AT:2
>    • ring looks like
> 
> 
>        • Address Status State Load Owns Token 85070591730234615865843651857942052865
127.0.0.4 Up Normal 464.98 KB 50.00% 0 127.0.0.5 Up Normal 464.98 KB 0.00% 1 127.0.0.6 Up
Normal 464.99 KB 50.00% 85070591730234615865843651857942052864 127.0.0.7 Up Normal 464.99
KB 0.00% 85070591730234615865843651857942052865
> 
> Is that what I should expect the ring to look like? Is there anything else I should be
testing/validating to make sure that things are configured correctly for NTS?
> 
> Thanks
> Anand
> 
> 


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