If you're planning to have another DC, then it's better to start to use
NetworkTopologyStrategy from beginning - just specify the one DC, and when
you get another, it will be simply to expand to it (see documentation:
https://docs.datastax.com/en/cassandra-oss/3.0/cassandra/operations/opsAddDCToCluster.html).
When adding new DC, for system keyspaces you can use following script to
perform adjustments:
https://github.com/DataStax-Toolkit/cassandra-dse-helper-scripts/tree/master/adjust-keyspaces
(it could be used for non-system keyspaces as well)
On Sat, Dec 19, 2020 at 10:21 AM Manu Chadha <manu.cha...@hotmail.com>
wrote:
> Is it possible to use NetworkTopologyStrategy when creating a keyspace and
> add data centers later?
>
> I am just starting with an MVP application and I don't expect much
> traffic or data. Thus I have created only one data center. However, I'll
> like to add more data centers later if needed
>
> I notice that the replication factor for each data center needs to be
> specified at the time of keyspace creation
>
> CREATE KEYSPACE "Excalibur"
>
> WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'dc1' : 3, 'dc2' :
> 2};
>
> As I only have dc1 at the moment, could I just do
>
> CREATE KEYSPACE "Excalibur"
>
> WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'dc1' : 3};
>
> and when I have another datacenter say dc2, could I edit the Excalibur
> keyspace?
>
> ALTER KEYSPACE "Excalibur"
>
> WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'dc2' : 2};
>
>
>
> or can I start with SimpleStrategy now and change to
> NetworkTopologyStrategy later? I suspect this might not work as I think
> this needs changing snitch etc.
>
>
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
--
With best wishes, Alex Ott
http://alexott.net/
Twitter: alexott_en (English), alexott (Russian)
