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From Peter Crowther <>
Subject RE: Are there issues with running multiple instances of tomcat?
Date Fri, 18 Apr 2008 11:12:35 GMT
> From: David Brown []
> Sent: 18 April 2008 12:00
> To:
> Subject: Are there issues with running multiple instances of tomcat?
> We are currently running two instances of tomcat on our
> systems. One is for
> a vendor specific application and the other is for in-house written
> applications. We are careful to make sure the ports do not
> conflict and
> there are plenty of resources to support both; memory and CPU.
> Recently the statement has been made that the two instances
> can conflict
> with each other and cause issues and instability with the
> applications.

That sounds like classic FUD unless the person concerned can back it up.  Who's trying to
pass the buck for a problem?  The vendor or the in-house dev team? :-)

>  Is this true? I was under the impression that since they are
> in their own
> JVM's neither tomcat would have any affect on the other. If
> there are issues in what form may they take place?

They'll compete for resources (notably disk i/o and the overall system cache), but I'm not
aware of any other issues.  I've seen one big production site run with three load-balanced
Tomcats on one (big!) box, simply so that the organisation could restart one Tomcat instance
at a time for upgrades.  I've not heard of any resulting instability or issues, but the standard
disclaimer applies - it ain't my site, so I may not have heard everything!

                - Peter

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