replication

How to set the replication factor for a new graph.

Synopsis 

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

Description 

Create a new graph. The graph_name specified is used to create two Cassandra keyspaces, graph_name and graph_name_system, and can only contain alphanumeric and underscore characters.

Examples 

Create a new graph and set the graph_name replication configuration using replication()as well as the graph_name_system configuration using systemReplication(). Apache Cassandra settings for replication factor are used, either SimpleStrategy for single nodes or NetworkTopologyStrategy for multiple nodes or multiple datacenters.

The default replication strategy for a multi-node or multi-datacenter graph is NetworkTopologyStrategy, whereas for a single node, the replication strategy will default to SimpleStrategy. The number of nodes will determine the default replication factor:
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
greater than 3 3 5 
system.graph('food').
  replication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3 }").  
  systemReplication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3 }").
  ifNotExists().create()
The resulting list:
==>null
The replication settings can be verified using the cqlsh tool, running the CQL command DESCRIBE keyspace food;.

In addition to setting the replication factor for the graph_name keyspace, the replication factor for the graph_name_system must also be set.