Application Deployment process

By mcpherson1135 ·
I'm looking for some help in figuring out how to deploy a java based website using Resin as an application server. My challenge is that we cannot have any downtime while deploying updates to the website. Our environment is 80 webservers load balanced across 2 sites - 40 in each. Simple answer is take 40 offline, update, bring them up, then update the other 40. Unfortunately, done this way, when there are functionality changes, the experience by the end user would be different depending on which server (updated or not) they attached to. So, how do I deploy changes without taking down the web, and ensuring all users see the same content at the same time?

Direct answers or pointers to online resources would be greatly appreciated.

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