Hi All, I'm planning to upgrade my C* cluster to version 3.x and was wondering what's the best way to perform a rollback if need be.
If I used snapshot restoration, I would be facing data loss, depends when I took the snapshot (i.e. a rollback might be required after upgrading half the cluster for example). If I add another DC to the cluster with the old version, then I could point the apps to talk to that DC if anything bad happens, but building it is really time consuming and requires a lot of resources. Can anyone provide recommendations on this matter? Any ideas on how to make the upgrade foolproof, or at least "really really safe"? Thanks!
