title: Can Cassandra cluster have even number of nodes?
body: <p>Currently running a 3 node cluster with replication factor 3 on the keyspaces. Need to add more nodes to the cluster as the size of each node is approaching 2TB.
  Can I add just 1 more node to the cluster and have a 4 node cluster or <strong>does the cluster always need to have odd number of nodes?</strong> Using a consistency level of ONE currently for both read and write.</p>