What you have described below should work just fine. When I was replacing nodes in my ring, I ended up creating a new datacenter with the new nodes, but I was upgrading to vnodes too at the time.
-Arindam From: nash [mailto:nas...@gmail.com] Sent: Monday, April 28, 2014 10:52 PM To: user@cassandra.apache.org Subject: Migrating Cassandra to New Nodes I have a new set of nodes and I'd like to migrate my entire cluster onto them without any downtime. I believe that I can launch the new cluster and have them join the ring and then use nodetool to decommission the old nodes one at a time. But, I'm wondering what is the safest way to update the seeds in the cassandra.yaml files? AFAICT, there is nothing particularly special about the choices of seeds? So, prior to starting decom, I was figuring I could update all the seeds to some subset of the new cluster. Is that reliable? TIA, --nash
