[JBoss-dev] httpd and tomcatClustering gives 404 during redeploy.

[Jean-frederic Clere]

Scott M Stark wrote:

> The AbstractWebDeployer/TomcatDeployer can inform tomcat that an 
> undeploy is begining. Are you looking for a distinction between an 
> unavailable app and one that is being redeployed?

Yes. I know that "there is no guarantee that the redeploy will succeed" 
but in production that should not happend and even in this case the 
customer probably prefer a 503 to a 404. (If the request cannot be 
routed to another node).

> I would think not as there is no guarantee that the redeploy will 
> succeed. I don't see that the MainDeployer needs to change, just the 
> TomcatDeployer.

The actual TomcatDeployer doesn't know that a redeploy is taking place 
how could it inform Tomcat?

Cheers

Jean-Frederic

>
> Jean-frederic Clere wrote:
>
>> Hi,
>>
>> I am trying to find a way to improve the behaviour of mod_proxy httpd
>> and JBossAS when an application is reployed.
>> For the moment in MainDeployer.java we have something like:
>> redeploy()
>> {
>>   undeploy();
>>   deploy();
>> }
>> Due to this Tomcat doesn't know that the webapp is being redeployed and
>> between the first undeploy() and end of deploy() is will return 404.
>>
>> It is possible to add a ContainerListener in Tomcat but the only things
>> we get are removeChild and addChild events. It is possible to send a
>> message to httpd to tell that the context of the webapp is not available
>> in the node (to try to use another node of the cluster).
>>
>> I think that to make it clean we need to add a start_redeploy and
>> end_redeploy event in Tomcat and modify MainDeployer and
>> AbstractWebDeployer so that the redeploy event could reach the Tomcat
>> classes.
>>
>> Comments?
>>
>> Cheers
>>
>> Jean-Frederic
>>
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