As per my understanding, 2 same seed nodes per dc is the way to go..
If u r not creating two isolated set of nodes in ur cluster, there may be nodes
referring each other in a way that everyone is able to know everyone else..
Anuj
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From:Chris Mawata
Seeds are used in two different ways:
1) When joining the ring, the joining node knows NOTHING about the cluster, so
it uses a seed list to discover the cluster. Once discovered, it saves the
peers to disk, so subsequent starts it will find/reconnect to other nodes
beyond just the explicitly
