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From Simão Fontes <>
Subject tomcat 5.5.25 - Multiple Connectors and performance lost
Date Tue, 10 Nov 2009 18:38:00 GMT

I need help configuring a tomcat server, 5.5.25, running on Redhat EL 5.2.

I have 4 web applications that communicate with each other. My problem 
consists in getting the information form the various applications when 
the number of threads is reached only by one application.
When I contact a application named wayback this searches in an index 
that is served by another application named nutchwax. When I put a 
client making 100 requests to wayback and the maxThreads is configured 
to 100 then the wayback application enters in deadlock. Because tomcat 
cannot create another thread for nutchwax application.
The applications interact in this way:

	*Nutchwax -> Index -> User
	*Wayback -> *Nutchwax -> Index -> User
	*Wayback -> *Nutchwax -> Index -> *ArcProxy -> *Browser -> User
	* means that this is a application of tomcat

I found a way to resolve the deadlock by separating the applications in 
different connectors, I made 4 connector, one each for application I 
want to use.
This originated a throupt that was of about 1.30sec to 16.30sec.

The new server.xml file is configured with 4 service/engine/host

   1. <Service name="reciver">  
   2.                 <Connector port="8080" maxHttpHeaderSize="8192" maxThreads="10" 
   3.                            enableLookups="false" acceptCount="100"  
   4.                            connectionTimeout="10000" disableUploadTimeout="true"   
   5.                            useBodyEncodingForURI="true"/>  
   6.                 <Engine name="reciver" defaultHost="localhost" jvmRoute="host1">
   7.                         <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
   8.                                resourceName="UserDatabase" />  
   9.                         <Host name="localhost" appBase="webapps" unpackWARs="true"
  10.                               autoDeploy="false" xmlValidation="false"  
  11.                               xmlNamespaceAware="false">  
  12.                                 <Context docBase="browser" path="/browser" reloadable="false"/>
  13.                         </Host>  
  14.                 </Engine>  
  15.         </Service>  
  16.         <Service name="reciver2">  
  17.                 <Connector port="8081" maxHttpHeaderSize="8192" maxThreads="10" 
  18.                            enableLookups="false" acceptCount="1"  
  19.                            connectionTimeout="10000" disableUploadTimeout="true"   
  20.                            useBodyEncodingForURI="true" proxyName="" proxyPort="80"/>
  21.                 <Engine name="reciver2" defaultHost="example_app" jvmRoute="host2">
  22.                         <Host name="example_app" appBase="test_app/example_app" unpackWARs="true"
  23.                               autoDeploy="false" xmlValidation="false"  
  24.                               xmlNamespaceAware="false">  
  25.                                 <Context docBase="example_app" path="/example_app"
  26.                         </Host>  
  27.                 </Engine>  
  28. </Service>  
  29. (...Repeted 2 more times.)  

Thanks in advance for your help,

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