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From Robert Jackson <robe...@promedicalinc.com>
Subject Re: Specifying exact nodes for Consistency Levels
Date Mon, 02 May 2011 18:09:53 GMT
The only way I can think of would be to use NetworkTopologyStrategy and PropertyFileSnitch
to define two data centers. Set node1-node3 in DC1 then set node4 in DC2. Then set the strategy_options=[{DC1:3,
DC2:1}] for that keyspace. 

This would make your cluster conceptually similar to a split datacenter as described in the
Brisk white paper. 

References: 

http://www.datastax.com/docs/0.7/operations/datacenter 
http://www.datastax.com/wp-content/uploads/2011/03/WP-Brisk.pdf 

Robert Jackson 

----- Original Message -----
From: "A J" <s5alye@gmail.com> 
To: user@cassandra.apache.org 
Sent: Monday, May 2, 2011 1:26:31 PM 
Subject: Specifying exact nodes for Consistency Levels 

Is it possible in some way to specify what specific nodes I want to 
include (or exclude) from the Consistency Level fulfillment ? 
Example, I have a cluster of 4 nodes (n1,n2,n3 and n4) and set N=4. I 
want to set W=3 and want to ensure that it is n1,n2 and n3 only that 
are used to satisfy w=3 (i.e. n4 is excluded for w=3 calculation). 

Thanks. 

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