Mod_jk vs mod_cluster vs mod_proxy_ajp for Apache-based ATG Load Balacning

We are currently using mod_jk for load balancing our ATG Commerce Page Servers running on JBoss.
There are many nice things about mod_jk: ajp support, jkstatus adminstration ability, performance, etc.
However, there is a deficiency with mod_jk: It cannot accurately tell when a JBoss node is unavailable to serve pages! mod_jk only looks for a TCP ping response from JBoss, it does not have any ability to check a "health" page and understand situations like: App server out of memory, applicaiton not deployed even though the server is available, no threads available on the server, server shutting down or starting up, etc. From what I see, mod_jk will direct users to application servers that are in any one of these invalid states. Sending a user to a server that is not ready to serve content is not ideal.
Because of the issues with mod_jk, I have started looking at other alternatives that can:
1. More accurately determine the health of the application to load balance in a superior manner than mod_jk (i.e. tell if the app server is out of memory, deploying, going up/down, etc)
2. Meet or exceed the performance characteristics of mod_jk (which probably means continuing to use AJP)
3. Have an way to drain sessions of users on a particular node to allow for rolling deploys by taking specific Jboss nodes out of the cluster temporarily, applying the update, testing the update by directly accessing Jboss and then adding the node back into the cluster
mod_cluster looks to be a solution that fits these requirements. I think mod_proxy_ajp could also be used, but because it is not a jboss-specific apache module, some manual work would need to be done to have it read a healthcheck JSP page. I'm not sure if this is possible, but I think it might be.
Has anyone used mod_cluster or mod_proxy / mod_proxy_ajp with ATG? Any thoughts on this?
Right now I am leaning strongly towards mod_cluster. http://www.jboss.org/mod_cluster

Another important benefit of using mod_cluster is that it automatically registers new workers when they are added/removed from the cluster. Therefore its a better choice.
-Gaurav

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You have to run "make clean" and then make.
Probably the files could not be compiled because of errors in the first place.
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CF10 64bit Apache connector (mod_jk.so) does not work for Apache2.4.3 (windows)

CF10 64bit Apache connector (mod_jk.so) does not work for Apache2.4.3 (win64), where can I get a module that works?
I get this error from Apache :
C:\www\Apache2.4\bin>httpd -t
httpd: Syntax error on line 741 of C:/www/Apache2.4/conf/httpd.conf: Syntax error on line 2 of C:/www/Apache2.4/conf/mod_jk.conf: Cannot load C:\\ColdFusion10\\config\\wsconfig\\1\\mod_jk.so into server: The specified procedure could not be found.
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Please check out this link.
http://rob.brooks-bilson.com/index.cfm/2012/2/21/Installing-ColdFusion-10-with-Apache-on-W indows
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I am having some problems installing the tomcat connector for Apache web server on Linux (Red Hat enterprise).
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Syntax error on line 3 of /etc/httpd/conf.d/tomcat_connector.conf:
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But it's working now.

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http://maven.apache.org/
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eom

Hi,
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John H.

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<BLOCKQUOTE>quote:<HR>Originally posted by John Haasbeek ([email protected]):
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K.

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Will Apple do this, do you think?
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Hello Sudhir,
Thanks for your response. However, in this case, the quantity has not been exceeded.
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The checks that you have mentioned get hit only after the IR amount crosses the GR amount of 11400 and then th einvoice goes into payment block. Which is correct.
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Thanks!
PM

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Mod_jk vs mod_cluster vs mod_proxy_ajp for Apache-based ATG Load Balacning

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