What I understand is that SimpleStrategy determines the endpoints for replica's by traversing the ring clock-wise.
NetworkTopologyStrategy determines the replica's by traversing the ring clock-wise and taking into account the racks and DC locations. Since the file used by PropertyFileSnitch puts all endpoints in the same data-center and rack, isn't the result of the endpoint selection basically the same? Thanks! Rene 2014-08-05 12:56 GMT+02:00 Mark Reddy <mark.re...@boxever.com>: > Yes, you must run a full repair for the reasons stated in the yaml file. > > > Mark > > > On Tue, Aug 5, 2014 at 11:52 AM, Rene Kochen <rene.koc...@schange.com> > wrote: > >> Hi all, >> >> I want to add a data-center to an existing single data-center cluster. >> First I have to make the existing cluster multi data-center compatible. >> >> The existing cluster is a 12 node cluster with: >> - Replication factor = 3 >> - Placement strategy = SimpleStrategy >> - Endpoint snitch = SimpleSnitch >> >> If I change the following: >> - Placement strategy = NetworkTopologyStrategy >> - Endpoint snitch = PropertyFileSnitch -> all 12 nodes in this file >> belong to the same data-center and rack. >> >> Do I have to run full repairs after this change? Because the yaml file >> states: IF YOU CHANGE THE SNITCH AFTER DATA IS INSERTED INTO THE CLUSTER, >> YOU MUST RUN A FULL REPAIR, SINCE THE SNITCH AFFECTS WHERE REPLICAS ARE >> PLACED. >> >> Thanks! >> >> Rene >> >> >> >
