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Peter,

On 4/30/2010 10:33 AM, Peter Crowther wrote:
> In normal use, Tomcat1 is running.  The load balancer directs all users to
> Tomcat1.  Tomcat2 could even be stopped.

I would say that "normal use" would include both (or however many)
instances running in parallel. When it's time to upgrade, you mark one
or more nodes in the cluster as "don't send any new users to this node"
and wait for all the users on those nodes to complete their work.

After that, Peter's scenario is exactly the same.

- -chris
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