RE: lb-problem with mod_jk: high cpu load on apache when tomcat b reaks down

[GOMEZ Henri <hg...@slib.fr>]

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                 ___[_]____
EMAIL : hgomez@slib.fr        (. .)                     
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>-----Original Message-----
>From: Timo Carl [mailto:carl.timo@ems.guj.de]
>Sent: Wednesday, May 23, 2001 4:38 PM
>To: tomcat-user@jakarta.apache.org
>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
>GB)
>|
>|each:
>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
>load.
>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
>post:
>
>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
>architecture?
>Maybe anyone solved that problem?
>
>Greetings and thanks in advance,
>Timo Carl
>

Re: lb-problem with mod_jk: high cpu load on apache when tomcat breaks down

[Timo Carl <ca...@ems.guj.de>]

The problem has been seen on both, ajp13 and ajp12. 
We use tomcat-3.2.1.

What do think about using mod_jserv again?
What kind of quality has the T3.3 cvs mod_jk? Is it possible to use it
in a productive environment?

Greetings,
Timo

GOMEZ Henri wrote:
> 
> 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 ....