Please update mod_jk. 1.2.6 is *very* outdated. We are now at 1.2.22 and
a lot of things have improved.
After upgrading, check your configuration against the reference guide in
the docs, especially the pages for the worker properties and Apache
directives. You might want to add some more timeouts.
BTW: Maximum Apache parallelity of 150 does not really fit to a maximum
tomcat parallelity of 1500 unless your tomcat does serious extra work .
Regards,
Rainer
Brantley Hobbs wrote:
All,
I have a web application that appears to run just fine at low loads, but
when we ramp up to high load levels, strange things start happening.
The symptoms are a *ton* of apparently hung threads on the tomcat status
page for my JK connector. They're in stage "S", with 0KB sent and 0KB
recv and they never die.
Eventually, we reach a point on httpd where we get:
[error] server reached MaxClients setting, consider raising the
MaxClients setting
And when we reach this point, the entire httpd server stops responding.
I post this to the tomcat list because this same server serves PHP
under similar (or worse) loads with no problems.
Here's my worker properties file:
worker.lbJ2EE.balanced_workers=web1
worker.web1.type=ajp13
worker.web1.host=128.192.100.14
worker.web1.port=8009
worker.web1.lbfactor=1
worker.web1.retries=5
worker.web1.connection_pool_timeout=60
Here's my AJP connector's configuration:
<Connector port="8009" enableLookups="false" redirectPort="8443"
protocol="AJP/1.3" maxThreads="1500" backlog="300"
connectionTimeout="60000"/>
Here's my httpd worker.c configuration
<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>
Tomcat 5.5.23 (Sun jvm 1.6.0-b105)
Apache 2.0.52
mod_jk 1.2.6
All running on RHEL4
Any help appreciated! I don't have a great deal of Tomcat load tuning
experience.
Brantley Hobbs
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