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tomcat timouts - too many busy connections - how to solve ?

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Hello Gurus,

this is my tomcat cluster. 3 servers and on each server 3 tomcats - typical loadbalancer

Apache 2.2.3
mod_jk 1.2.25
tomcat 5.5.27

server1 - tomcat11
server2 - tomcat21
server3 - tomcat31

In my opinion everything running as should, but... ...from time to time I receive message from my monitoring system that for example:
tomcat22 has "Too many busy connections". I would like to ask You about timeout settings for this configuration. How to findout proper settings for this kind of cluster. Is it possible to measure something (pings etc.etc.) and base on the results configure timouts.

In I have this:

for the rest workers looks similar...

I hope that somebody could help me.


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