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From "Majors, Jeremy" <jmaj...@tribune.com>
Subject Re: Expected Delay when Switching to New Version of Application Using Parallel Deployment (Tomcat 7.0.27)
Date Tue, 09 Jul 2013 13:58:13 GMT
On 7/8/13 10:52 PM, "Christopher Schultz" <chris@christopherschultz.net>
wrote:

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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?

Our current deployment mechanism involves placing a new context.xml file
in {tomcat.root}/conf/Catalina/localhost/ which has the docbase property
set to an already exploded WAR.

>
>> 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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