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From "Lukas Sklenar" <Lukas.skle...@detica.com>
Subject [users@httpd] webservice clustering trouble
Date Fri, 14 Jan 2011 16:29:19 GMT
Hello,

I have deployed 3 tomcat6.0.29 webapps, each of which exposes a
webservice, and am using apache2.2 and mod_jk-1.2.31-httpd-2.2.3.so to
cluster them - a performance exercise. 1 webapp as well as apache is
running on my dev box, and 2 other webapps are running on the dev boxes
of my colleagues sitting next to me.

I can connect to each webapp (both webapp and webservice) individually,
and I can connect to them via my apache as well.
(I know that the roundrobin is working, I have a test.jsp that tells me
what machine I am currently talking to.)

Everything appears to be running fine. I can do individual webservice
load tests on each machine individually, without any problems, nothing
bad in the logs, expected results, etc.

However, when I do a loadtest on the apache port, the 2 remote tomcats
start having
....
SEVERE: Invalid message recieved with signature 28276
14-Jan-2011 15:18:45 org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message recieved with signature 28276
14-Jan-2011 15:18:45 org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message recieved with signature 28276
14-Jan-2011 15:18:48 org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message recieved with signature 28276
....

the above dumps in their logs, load test throughput goes down, and the
load test reports errors. The number of errors the loadtest reports
matches the number of the " SEVERE: Invalid message recieved with
signature 28276" lines I get on the 2 remote machines.

I am ready to post my config if need be, but wanted to know if someone
has come across this before?
I can find some reference in the archives which suggests I should update
tomcat/apache/java etc but I have the latest versions already.

Thank you,


Lukas

p.s. Apologies if the format of the message is incorrect, this is my
first post to this forum.


______________________________________________
Lukas Sklenar
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www.detica.com

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