-And not imagine that you need to deploy a drastic API change - so the new version of the servers will be "3.4.0". You can't afford to bring the system down for the deployment. But as the servers are configured to only talk with compatible versions - you're in luck. You can start the deployment process and each node, one by one will be replaced with the new version - the old servers simply stop communicating with them, and the new versions start talking with each other until only the "new" nodes are left.
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