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Jeremy,
On 7/9/13 9:58 AM, Majors, Jeremy wrote:
> On 7/8/13 10:52 PM, "Christopher Schultz"
> <ch...@christopherschultz.net> wrote:
>
> 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.
I suspect you are seeing the delay caused by Tomcat only
periodically-polling for deployment descriptor updates: they are not
instantaneous. I think you can adjust the polling time by setting the
backgroundProcessorDelay attribute on your <Host> element. (I looked
at the code to determine if this was true, but I can't seem to prove
it. I don't see any other options that could affect this polling-time,
so I suspect this is the case).
Note that reducing the backgroundProcessorDelay from the default of 10
may lead to performance problems, as a lot of resources are scanned to
see if any of them has changed.
If you want to allow for near-instantaneous redeployment, you should
use the manager webapp directly, and possibly set autoDeploy=false.
- -chris
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