>
>
> create keyspace civicscience with replication_factor=3 and
> strategy_options = [{us-east:3}] and
> placement_strategy='org.apache.cassandra.locator.NetworkTopologyStrategy';
>
> FYI the replication_factor property with the NTS is incorrect, the next(?)
> revision of 0.8 will raise an error on restart.
>
I'm not sure what you're saying. Should it have been:
create keyspace civicscience with strategy_options = [{us-east:3}] and
placement_strategy='org.apache.cassandra.locator.NetworkTopologyStrategy';
?
> I'm wondering if I write my own snitch that extends Ec2Snitch with
> overrides as follows:
> getDC = if(AZ == c || d) return return us-east (to keep current nodes the
> same) else return us-east-hadoop;
> getRack = return super(); (returning a,b,c,d seems ok)
>
> prob easier to use the PropertyFileSnitch, see the yaml file and the
> conf/cassandra-topology.properties . You can then manually put the nodes
> into the DC and Rack you want.
>
I'll read up on them next then. The Ec2Snitch seemed tempting to use, given
I was in Ec2 ;-)
> -Can I (how do I safely) change the keyspace strategy_options
> from [{us-east:3}] to [{us-east:2, us-east-hadoop:1}] This seems like
> the riskiest/most complicated step of everything I've proposed...
>
> http://wiki.apache.org/cassandra/Operations#Replication
>
The wiki has changed since I last read it (I guess that happens) ;-) I
think I understand how to make changes and migrate data around now.
