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From Andre-John Mas <>
Subject Re: Multiple data centers and redundency?
Date Wed, 26 Aug 2009 00:38:17 GMT

I have just been given some more information. The architecture would  
involve a DNS server perodically giving out a DNS address for one DNS  
server and then an address for the other. Each data centre would have  
multiple hosts, each running multiple tomcats. The load balancer would  
take the incoming request and send it to one of the tomcat instances,  
using a cookie to send the request back to the same tomcat instance.

I see there is clustering available with Tomcat, but I don't see how  
this works across data centers, if at all.


On 25-Aug-2009, at 20:30, Andre-John Mas wrote:

> Hi,
> I have been asked to look into a solution that would involve a few  
> different data centres each with their own set of load balanced  
> Tomcat servers. The requirement is for the users not to lose their  
> session if one data center goes down. I have never had to work on  
> something this large and have no idea to what extent this can be  
> achieved with Tomcat.
> My initial thoughts would be for each data center to have a session  
> pool, which is synced with each other, so if ever a Tomcat server or  
> data center goes down they can check in the pool to see if it exists  
> and then reuse that. It would mean extra communication behind the  
> scene, but I see no other way go about it.
> Any help would be appreciated.
> André-John
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