Have a scenario where it's necessary to migrate a cluster to a different set of hardware with minimal downtime. Setup is:
Current cluster: 4 nodes, RF 3 New cluster: 6 nodes, RF 3 My initial inclination is to follow this writeup on setting up the 6 new nodes as a new DC: https://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsAddDCToCluster.html Basically, set up new DC, nodetool rebuild on new nodes to instruct Cassandra to migrate data, change client to hit new DC, kill original DC. First question - is this the recommended way to migrate an in-use cluster to new hardware? Secondly, on the assumption that it is: That link gives the impression that DC-aware clients will not hit the "remote" DC - is that the case for the Java driver? We don't currently explicitly set PoolingOptions ConnectionsPerHost for HostDistance.REMOTE to 0 - seems like that would be an important thing to do? Thank you.
