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From GOMEZ Henri <>
Subject RE: Problems with ajp13, mod_jk, and load balancer
Date Fri, 22 Jun 2001 06:55:46 GMT
>I'm having problems getting ajp13 working reliably with mod_jk 
>and the load
>balancer. Here is my configuration:
>- 4 Sun Solaris Sparc machines with similar setup
>- Apache 1.3.20
>- Tomcat 3.2.2
>- mod_jk compiled from Tomcat 3.2.2 source
>- JDK 1.2.2
>- Cisco Local Director sitting in front of Solaris machines, doing load
>- Running servlet based application which uses HTTP sessions, by use of
>On all four machines, I have the Tomcat set 
>up to load
>balance between all four machines, with lbfactor=1 and 
>type=ajp13. The worker
>names are the same in all four files with the same host. 
>Everything seems to
>work fine until I click reload on the browser a good 20-25 
>times when viewing a
>servlet generated page. My application (which uses HTTP 
>sessions stored on the
>server) complains about an invalid session (basically it can't 
>find the session
>information for the session id passed). I turned the "prompt 
>for cookies"
>option on in my browser and found that after a good number of 
>clicks, it tries
>to issue me a new cookie from a different Tomcat! It looks 
>like under "heavy"
>load the load balancer tries to send me to a different Tomcat 
>even though the
>session id contains the worker name (ex. a164gy8s01.www3, 
>where www3 is worker
>I then tried the same test with a Linux machine running Apache 
>1.3.20 and
>Tomcat 3.2.2. When clicking heavily, I get a 500 Server error. 
>I noticed in the
>jk_mod log file, it complains about no workers being available.
>If I switch from ajp13 to ajp12, everything works fine in both 
>mentioned above. No 500 server errors or invalid sessions 
>caused by the request
>going to the wrong Tomcat. Is there a bug in ajp13 or is there 
>some kind of
>configuration I can tweak?

Send us the server.xml and httpd.conf !=)
I feel that you have to less java threads available

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