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 : [EMAIL PROTECTED] (. .) PGP KEY : 697ECEDD ...oOOo..(_)..oOOo... PGP Fingerprint : 9DF8 1EA8 ED53 2F39 DC9B 904A 364F 80E6 >-----Original Message----- >From: Timo Carl [mailto:[EMAIL PROTECTED]] >Sent: Wednesday, May 23, 2001 4:38 PM >To: [EMAIL PROTECTED] >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 >