



        Replication (How many copies, and where do there go)
        
        As part of the Data Modeling I define 1 or more KeySpaces
        
        I create more than 1 KeySpace because some of my table may need
        replication and other table may not.
        
        My create KeySpace command looks like this:
        
                CREATE KEYSPACE sales
                 WITH REPLICATION = {'class' : 'NetworkTopologyStrategy',
                                     'DataCenterWest' : 2, 'DataCenterEast' : 1};

        Some of my table may need special Replicaiton..
        
        My create KeySpace command looks like this:
        
                CREATE KEYSPACE sales
                 WITH REPLICATION = {'class' : 'NetworkTopologyStrategy',
                                     'DataCenterEurope' : 2, 'DataCenterUS' : 0};


        --------------------------------------------------
        
        Replication Factor (RF) the number of copies
        Replication Strategy (RS) the location of those copies
        
        
        
        
