I'm working on a web application which sometimes has several daemon
threads doing I/O processing in the background. The application seems
to be fine except when several tasks are running, sometimes Tomcat gets
a request and doesn't seem to process it. The request seems to time out
without ever being passed into my application for processing.
My index page has an auto-refresh meta tag so I see this problem
frequently. The really strange thing is if I click reload once, the
next request also hangs, but if I click reload a 2nd time, this request
is processed very quickly. This behavior is very consistent, and
doesn't seem to have anything to do with the state of the background
tasks (they are still running).
I mention the background tasks because I only see this hanging behavior
when the background tasks are active. When my application is idle, I
never see the behavior. Beyond that, I can't figure out what the
background tasks might be doing which would prevent Tomcat from
processing incoming requests:
* Accepting UDP packets on the loopback address.
* Reading standard out from a child process and writing it to a temp file.
Neither of these activities seem like they should interfere with Tomcat
request processing.
I have placed some logging calls on a filter I configured in my
application and for the hung requests, the filter never logs a request.
This seems to indicate that the request is getting stuck before my
application gets a chance to process it.
Has anybody seen anything like this before?
Any advice for troubleshooting?
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