In terms of NoSQL databases, Apache Cassandra handles multi-data center awareness better than any other. To configure this, each node must use GossipingPropertyFileSnitch (as previously mentioned in the preceding cassandra.yaml configuration process) and must have its local data center (and rack) settings defined. Therefore, I will set the dc and rack properties in the conf/cassandra-rackdc.properties file:
dc=ClockworkAngelsrack=R40
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