First a brief background on the setup:
We are running Apache 1.3.31 utilizing mod_jk (not jk2). We are running two instances of Tomcat. Previously, both were version 4. Currently, we have one shared instance running the latest 5.x release (just compiled yesterday). We have one customer running a private 4.x instance.
With that said, we just moved to a new server (Dual Xeon, RHEL 3.0) and now the problem we are having is the customer who has this private instance has jsp pages that "hang". But, it does not hang all the time. What's weird, is most of the time, I can stop the shared instance and the customer's pages will stop hanging. I would like to fix the hanging completely, obviously.
Today though, the only thing that kept his pages from hanging was a full reboot. I am wondering if this is related to swap space usage. I don't know what else it would be, as I stopped/started his tomcat and apache numerous times. I tried using a different connector (AJP instead of Coyote).
Could this last problem be due to running tomcat5 *and* tomcat 4? I would say no, as that makes no sense this would be the case, especially when it (still)occurred after stopping the Tomcat 5 instance.
Essentially what happens is, Apache receives the request for the page, hands it off to Tomcat, tomcat returns half of the page (header/left menu) and just sits there. Hitting "stop" on the browser stops the transfer, however Tomcat never releases the Apache process. So we end up with dozens, sometimes hundreds of Apache processes that are "hung" by tomcat. This results in memory usages exceeding 2gb!
Has anyone experienced similar problems or have any suggestions?
-Sean Finkel
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