DSE Graph replication factor

How to set the replication factor for a new graph.


system.graph('graph_name').replication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3, 'dc2' : 2 }")


Create a new graph and set the graph_name replication configuration using replication()as well as the graph_name_system configuration using systemReplication().
Restriction: Both must be set at the time of graph creation, because replication factor and system replication factor cannot be altered once set for the graph_name and graph_name_system keyspaces.

DSE database settings for replication factor are used, either SimpleStrategy for a single datacenter or NetworkTopologyStrategy for multiple datacenters.

The default replication strategy for a multi-datacenter graph is NetworkTopologyStrategy, whereas for a single datacenter, the replication strategy will default to SimpleStrategy. The number of nodes will determine the default replication factors:
number of nodes per datacenter graph_name replication factor graph_name_system replication factor
1-3 number of nodes per datacenter number of nodes per datacenter
4 3 4
5 or greater 3 5


An example that creates a graph on a cluster with a two datacenters:
  replication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3, 'dc2' : 2 }").  
  systemReplication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3, 'dc2' : 2 }").
The result:
shows that the graph was successfully created.
The replication settings can be verified using the cqlsh tool, running the CQL DESCRIBE KEYSPACE command:
with a result:
CREATE KEYSPACE food WITH replication = {'class': 'NetworkTopologyStrategy', 'dc1: '3', 'dc2' : 2 }  AND durable_writes = true;
CREATE KEYSPACE food_system WITH replication = {'class': 'NetworkTopologyStrategy', 'dc1: '3', 'dc2' : 2 }  AND durable_writes = true;