Each server in the cluster deploys independently.  If you start a server, once 
the app is deployed on that server and the server start is completed, the app 
is available on one node.  As more servers finish their startup process, they 
(and the app) become available.

I think redeploy is a more significant issue.  If at the same time you copy a 
new version of the app to the deploy dir of all the servers, it will be 
undeployed and redeployed on all the servers, and until redeploy is complete it 
won't be available.  So, staggering the redeploys is an option to prevent this.

Suggest you experiment; that's the best way to learn what will happen.  If 
deploying your app takes too long to experiment with, write a simple webapp 
that has a ServletContextListener that goes to sleep for 15-30 secs in the 
contextInitialized() callback.  Then play around with different ways of 
deploying it on the cluster and observe what happens.

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