Hi all, I would appreciate an advice whether is a good idea to upgrade from cassandra 1.2.3 to 1.2.13 and how to best proceed. The particular cluster consists of 3 nodes (each one in a different DC having 1 replica) with a relativelly low traffic and 10GB load per node.
I am specifically interested whether is possible to upgrade just one node and keep it running like that for some time, i.e. if the gossip protocol is compatible in both directions. We are a bit afraid to upgrade all nodes to 1.2.13 at once in a case we would need to rollback. I know that the sstable format changed in 1.2.5 so in case we need to rollback, the newly written data would need to be synchronized from the old servers. Also, after the migration to 1.2.13, we would like to start using node-to-node encryption. I imagine that you need to configure it on all nodes at once, so it would require a small outage. Thank you in advance Jiri Horky
