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Hot upgrade between hotfix versions when running in HA #7480
Today is not always safe to upgrade between hotfix versions when you're running in HA. This is because distributed protocol is not versioned. We never did it, because Hazelcast didn't support this feature, so investing in a versioned distributed protocol was worthless.
Now that Hazelcast has it, we should version our distributed protocol, so our users can upgrade a cluster of servers, one by one.