I\'m a little confused about Cassandra seed nodes and how clients are meant to connect to the cluster. I can\'t seem to find this bit of information in the documentation.
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Your answer is right. The only thing I would add is that it's recommended to use the same seed list (i.e. in your cassandra.yaml) across the cluster, as a "best practices" sort of thing. Helps gossip traffic propagate in nice, regular rates, since seeds are treated (very minimally) differently by the gossip code (see https://cwiki.apache.org/confluence/display/CASSANDRA2/ArchitectureGossip).