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From Andreas Oesterer <oeste...@gmail.com>
Subject Problem with mod_mpm / mod_jk / Tomcat Configuration
Date Wed, 08 Jun 2005 17:50:47 GMT
Under high load, the loadbalancing seems to "forget" session affinity
and users have to log in again.

Apache 2.0.54 with mod_mpm
mod_jk 1.2.8
14 x Tomcat 4.1.31 instances

The MaxClient setting seems to be causing most of these troubles. I
don't exactly understand how the mpm and Tomcat settings are supposed
to correlate. As soon as I increase MaxClients to 3200 the troubles
start.


mpm settings:

<IfModule worker.c>
StartServers         4
MaxClients        2944
MinSpareThreads     25
MaxSpareThreads    800
ThreadLimit         96
ThreadsPerChild     64
MaxRequestsPerChild 0
ListenBacklog       500
</IfModule>



Tomcat settings (same for the 14 instances):


<Connector className="org.apache.coyote.tomcat4.CoyoteConnector" 
           acceptCount="100" 
      bufferSize="2048" 
      compression="off" 
      connectionLinger="-1" 
      connectionTimeout="60000" 
      connectionUploadTimeout="300000" 
      debug="0" 
      disableUploadTimeout="false" 
      enableLookups="false" 
      maxKeepAliveRequests="500" 
      maxProcessors="1000" 
      minProcessors="50" 
      address="%IP_ADDRESS%" 
      port="%CONNECTOR_PORT%" 
      protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler" 
      proxyPort="0" redirectPort="8443" 
      scheme="http" 
      secure="false" 
      tcpNoDelay="false" 
      tomcatAuthentication="true" 
      useBodyEncodingForURI="true" 
      useURIValidationHack="false">
 
The max processors is set to 1000, I assumed that would result in
14000 processors for all instances and therefore the 3000 max clients
of apache would be well within it. Is my assumption false adn I need
to allocate 3000 thread per instance instead?


Thanks, Andreas

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