I have four JBoss 3.2.5/Tomcat servers that are clustered to load balance traffic. The 
traffic comes from IIS/JK2 with a thread pool size of 200. I have been monitoring the 
status of the JK threads in JBoss using the MBean 
jboss.web:name=jk-8009,type=ThreadPool and it's attributes  currentThreadCount and 
currentThreadsBusy.

The anomally is that one server acts normally, being that under load the 
currentThreadsBusy count jumps up, but quickly recovers when load drops off. This is 
optimal for monitoring.

The other three servers increase the currentThreadsBusy count under load, but then it 
never drops off. The result is that currentThreadsBusy becomes a high water mark 
rather than  a proper monitor.

I have looked at the configurations and they are configured the same, as far as I can 
see. Can anyone explain this behaviour ?

Thanks.

//Nicholas



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