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From David Knox <>
Subject Re: can mod_jk detect web service unavailable
Date Wed, 03 Dec 2008 16:14:48 GMT
Hi Zeke,
You didn't say which version of JBOSS you're using, I'm assuming its  
a recent 4.x version that includes buddy-clustering.  You're JBOSS  
cluster will need to be reconfigured to do what you want. The JBOSS  
community lists and wiki ( is the best place for your  
question. The JBOSS community wiki has several articles on cluster  


David Knox
Information System Architect
+1 303-748-8906

On Dec 3, 2008, at 8:33 AM, Zeke wrote:

>> "Mark Thomas" <> wrote´╝Ü
>> Zeke wrote:
>>> Hi:
>>>     I have a JBOSS cluster which use Apache with mod_jk as HTTP load
> balancer. In my cluster, some nodes are deployed web service, but  
> not all.
> For example, node 1 contains web servicebook_service, I can call  
> the web
> service using URL "", but node 2  
> does not
> contain it. I hope mod_jk can help me to detect whether the  
> requested web
> service exists. That is to say, if I call the web service using "
>", mod_jk can know only node 1
> contains the web service and node 2 not, then the request will  
> always be
> dispatched to node 1. But with my current configuration on mod_jk and
> Apache, I fount that the request can be dispatched to node 2. Then  
> surely
> exception will be thrown, since the web service not exists on node 2.
>>>     Can mod_jk support it? Do I need some specific configuration?
>>>     Any suggestion from you will be very appreciated!
>> Only map the web service url to the nodes where it exists.
>> Mark
> Thanks for the reply, Mark!
> But I need a more "dynamic" way. For example, node 1 has deployed  
> the web
> service war, but it is down for some reason and can not work any  
> more. Then
> the web service URL will be unavailable while the JBOSS are still  
> running.
> Mapping the web service url seems can not handle it, the load  
> balancer will
> still dispatch the request to node 1. I hope mod_jk can detect if the
> requested web service is available at runtime.
> Thanks!
> Zeke

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