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How to update a High Availability web app

 
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Hello all,

I am trying to design a high availability webapp. The question is how can I design it so that I can add new functions to the software on a dalily basis without stopping the webapp.
It doesn't matter what server I will run the webapp (Tomcat, Jboss etc), you can choose one.

I am thinking to use JBoss clustering, stop one node, update it and turn it on, then stop the other and do the same. I don't really think that this will work without a bit of downtime.

Tanks in advance.

 
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