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Posted to users@tomcat.apache.org by "Majors, Jeremy" <jm...@tribune.com> on 2013/07/05 17:24:06 UTC
Expected Delay when Switching to New Version of Application Using
Parallel Deployment (Tomcat 7.0.27)
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. 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.
Please let me know if I haven't been clear.
Thanks,
Jeremy
Re: Expected Delay when Switching to New Version of Application
Using Parallel Deployment (Tomcat 7.0.27)
Posted by "Majors, Jeremy" <jm...@tribune.com>.
Thanks Chris for the suggestions. At this point I think it will be good
enough for our needs. Your comments have helped me understand the
process/inner-workings better.
Jeremy
On 7/11/13 10:39 AM, "Christopher Schultz" <ch...@christopherschultz.net>
wrote:
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA256
>
>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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Re: Expected Delay when Switching to New Version of Application Using
Parallel Deployment (Tomcat 7.0.27)
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
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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Re: Expected Delay when Switching to New Version of Application
Using Parallel Deployment (Tomcat 7.0.27)
Posted by "Majors, Jeremy" <jm...@tribune.com>.
On 7/8/13 10:52 PM, "Christopher Schultz" <ch...@christopherschultz.net>
wrote:
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA256
>
>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
>-----BEGIN PGP SIGNATURE-----
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>Comment: GPGTools - http://gpgtools.org
>Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
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Re: Expected Delay when Switching to New Version of Application Using
Parallel Deployment (Tomcat 7.0.27)
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
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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