Hi all,

We have some large clusters ( 1000+  nodes ), these are across multiple 

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?


Paul Chandler

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