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Date: Thu, 23 Jun 2011 06:47:28 -0400
Message-ID: <BANLkTi=wC+HgkgsTfJWhD=ko1FrTneuxdQ@mail.gmail.com>
Subject: Re: NTS Replication Strategy - only replicating to a subset of data
 centers
From: Eric tamme <etamme@gmail.com>
To: user@cassandra.apache.org
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On Wed, Jun 22, 2011 at 6:58 PM, AJ <aj@dude.podzone.net> wrote:
> I'm just double-checking, but when using NTS, is it required to specify A=
LL
> the data centers in the strategy_options attribute?
>
> IOW, I do NOT want replication to ALL data centers; only a two of the thr=
ee.
> =A0So, if my property file snitch describes all of the existing data cent=
ers
> and nodes as:
>
> $CASSANDRA_HOME/conf/cassandra-topology.properties:
>
> # Cassandra Node IP=3DData Center:Rack
> 175.1.1.1=3DDC1:RAC1
> 175.2.1.1=3DDC2:RAC1
> 175.3.1.1=3DDC3:RAC1
> # default for unknown nodes
> default=3DDC1:rac1
>
> Can I specify strategy_options as:
>
> strategy_options=3D[{DC1:2, DC2:1}]
>
> and just leave out DC3 entirely?
>
> If not, will setting the last one to 0 work?:
>
> strategy_options=3D[{DC1:2, DC2:1, DC3:0}]
>
>
> Thanks!
>


You do not need to specify all data centers with NTS replication
strategy.  Your endpoint snitch must specify all nodes.

-Eric