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From GOMEZ Henri <>
Subject RE: lb-problem with mod_jk: high cpu load on apache when tomcat b reaks down
Date Mon, 28 May 2001 12:33:27 GMT
Could you tell us if you're using ajp12 or ajp13 ?

The latest mod_jk in TC 3.3 cvs handle correctly the
case were on Tomcat failed or has been restarted ....

Henri Gomez                 ___[_]____
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>-----Original Message-----
>From: Timo Carl []
>Sent: Wednesday, May 23, 2001 4:38 PM
>Subject: lb-problem with mod_jk: high cpu load on apache when tomcat
>breaks down
>Hello tomcat-users,
>We are having a problem with mod_jk and load balancing. 
>Does anyone else have had similar problems with that kind of
>architecture setup?
>Our System:
>Alteon switch (round robin)
>three Apache 1.3.19 on three SPARC-Servers (called s1,s2,s3)(3 CPU, 3
>mod_jk with lb (in case of s1: 1*s1,0.001*s2,0.001*s3)
>two tomcats-3.2.1 on each server (jdk1.2.2, native threads, -Xms50M
>-Xoss4M -Xss4M -Xmx600M)
>We chose this architecture because the alteon is not able to perform
>session tracking properly.
>The Problem:
>On startup, the system works fine. Each java-Process has about 1-8% CPU
>After one day or so, one tomcat takes 40% CPU load or more. I think the
>reason is inside our applications. But thats not the error I want to
>After the error of a tomcat, the httpd-processes on EACH 
>Server begin to
>take a lot of CPU time (8-30% each).
>In server-status I can see that the processes are waiting for 
>a response
>of that tomcat.
>Of course I want to have a fault tolerance, but when I have a problem
>with one server, the other servers go down too.
>Did/Does anyone have the same problem and/or a similar system
>Maybe anyone solved that problem?
>Greetings and thanks in advance,
>Timo Carl

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