Hi all, We have some large clusters ( 1000+ nodes ), these are across multiple datacenters.
When we perform upgrades we would normally upgrade a DC at a time during a planned outage for one DC. This means that a cluster might be in a mixed mode with multiple versions for a week or 2. We have noticed that during our testing that upgrading to 4.1 causes a schema mismatch due to the new tables added into the system keyspace. Is this going to be an issue if this schema mismatch lasts for maybe several weeks? I assume that running any DDL during that time would be a bad idea, is there any other issues to look out for? Thanks Paul Chandler
