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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Expected Delay when Switching to New Version of Application Using Parallel Deployment (Tomcat 7.0.27)
Date Tue, 09 Jul 2013 03:52:26 GMT
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Jeremy,

On 7/5/13 11:24 AM, Majors, Jeremy wrote:
> For a simple web application, what is the expected delay when 
> switching to new version of an application when using the parallel 
> deployment process?  I'm trying to do timings right now with a
> single Hello World JSP and sometimes there is a delay of up to 4
> seconds when the new version of the application is deployed
> (running 5 users simultaneously using Jmeter with cookies turned
> off), but other times I don't see this behavior.

How are you deploying the new version? Are you dropping another WAR
file into the webapps/ directory, or are you using the manager webapp
to deploy the new version?

> Does anyone know if it is expected for there to be a slight hiccup
> in response times when the applications are deployed via parallel
> deployment?  I understand that many applications will have
> initialization logic and that may cause a delay, but I'm wondering
> if I should expect tomcat to introduce a very small delay when
> switching from the old version to the new version and if so, how
> long should I expect that process to take.

You might be seeing the delay that Tomcat has between auto-deployment
runs... it can't scan the webapps/ directory all the time for updates,
or it would significantly impact overall performance of the server.

- -chris
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