[jboss-user] [Tomcat, HTTPD, Servlets & JSP] - ajp threads hung in java.net.SocketInputStream.socketRead

[clb100]

I have a web application installed in jboss AS 4.2.2.  It seems to work fine under a light load but when I begin to add users all of my ajp threads stop responding until the load lightens.  I have taken multiple thread dumps and nearly all of my ajp threads have the following stack trace:
 

      java.net.SocketInputStream.socketRead0(Native Method)

      java.net.SocketInputStream.read(SocketInputStream.java:155)

      org.apache.coyote.ajp.AjpProcessor.read(AjpProcessor.java:1012)

      org.apache.coyote.ajp.AjpProcessor.readMessage(AjpProcessor.java:1094)

      org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:384)

 org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:366)

      org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)

      java.lang.Thread.run(Thread.java:803)


Does this mean that all of these threads are waiting on input from the client?  I don't see any db methods in the trace so I'm not sure what else it could be.  What would cause all of my ajp threads to end up in this state?

I'm running apache in front of it with mod_jk configured like this:

# Define a worker using ajp13
worker.test1.port=8009
worker.test1.host=app1
worker.test1.type=ajp13
worker.test1.lbfactor=1

# Define another worker using ajp13
worker.test2.port=8009
worker.test2.host=app2
worker.test2.type=ajp13
worker.test2.lbfactor=1

# Define the LB worker
worker.test_lb.type=lb
worker.test_lb.balance_workers=test1,test2
worker.test_lb.sticky_session=1
worker.test_lb.sticky_session_force=0
worker.test_lb.method=R

I can't figure out what would be causing this.  Any help would really be appreciated.

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