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From "Mark Benussi" <>
Subject RE: 24X7 deployment tips
Date Tue, 11 Jan 2005 17:40:38 GMT
Hi Sunil,

I think they keyword for your scenario is clustering.

Running multiple syncronised applications and databases allows you to take 
down servers during quiet periods and still maintain a service via the other 
servers whilst they are upgraded one by one.

Saying that I have worked on global .coms that always allow for some down 
time during large releases / maintenance. It is not going to be easy but I 
am sure you appreciate that.

One more thing that may cause a headache is session persistence under some 
Tomcat clustering models.

Thats all i can think of but i'm sure you will get better advice than mine.

----Original Message Follows----
From: sunil goyal <>
Reply-To: "Tomcat Users List" <>
Subject: 24X7 deployment tips
Date: Tue, 11 Jan 2005 09:30:39 -0800 (PST)

Hi all,

I am looking for resources for building and deploying
24X7 large scale web applications using Java. Can
anyone point towards any good books/links for the

If I am trying to deploy an application via
apache/tomcat on a linux platform, is it possible to
upgrade certain servlets without actually shutting
down the server. What kind of principle is generally
followed in real life applications for the same?

Any help in this regard is appreciated.



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