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From Edoardo Causarano <edoardo.causar...@gmail.com>
Subject Clustering with mod_jk
Date Fri, 01 Sep 2006 19:07:18 GMT
Hello List,

scenario:

- 4 node tc 5.0.28 vertical cluster ( :-| same server... still  
testing, but it could have been 8) listening on ajp
<Connector address="x.x.x.x" port="8009"
	maxProcessors="150" minProcessors="50"
	protocol="AJP/1.3"  
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"
	redirectPort="8443">

- 1 httpd 2.0.52 with mod_ajp 1.2.15 and prefork config on RH AS4,  
kernel 2.6.9-5.EL
	sticky sessions are disabled to avoid stress scripts hitting only  
one node

<IfModule prefork.c>
	StartServers       40
	MinSpareServers    80
	MaxSpareServers    280
	ServerLimit        4096
	MaxClients         4096
	MaxRequestsPerChild  4096
</IfModule>

- 1 application where a couple of thousand users should hammer the  
app deployed on the webapp

What happens is the app takes the stresser for a ride until 240 circa  
users then starts to die; jkmonitor sees linear increase on busy and  
max requests on only one node and pages hang; disabling the node  
moves the hung request handling to the next node.

Where's the bottleneck? Any known bug in mod_jk? Should I increase  
threads on the tomcat nodes?

Tnx,
e





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