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While creating keyspaces we are specifying replication factor for each data centers, what if nodes are spread across regions how do we specify replication ?
If nodes are spread across regions, say set of nodes in Europe and set of nodes in US form a cluster. Do such clusters exist or is there any possibility ? If yes, how do we define replication while creating keyspaces?
The physical location of data centres don't matter where replication is concerned.
Let me illustrate with this example where a cluster has:
The keyspace replication can be defined as:
CREATE KEYSPACE globalks
WITH REPLICATION = {
'class': 'NetworkTopologyStrategy',
'UK_DC': 3,
'FR_DC': 3,
'US_DC': 3,
'SG_DC': 3
};
And yes, lots of organisations have their clusters distributed across geographies. Cheers!
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