Threads issues in Tomcat 5.0.28

[Matt Robinson <ma...@yahoo.com>]

Hi, 

We have 5 instances of Tomcat 5.0.28 running on their
own high performance servers (dual XEON / 2GB RAM,
etc) receiving AJP13 connector requests via our main
web server which has IIS 5, IIS redirector, and
Tomcat4.

This works great even under high loads except for one
thing: after several hours of usage (could be 3 hours
or up 24 hours), the number of Tomcat threads on the
5.0.28 systems will suddenly increase at a rapid rate
until Tomcat no longer responds to requests. It will
hit the max # threads (which defaults to 200) and
essentially freeze until it is restarted.

This is strange because this behavior does not seem to
correspond to increased usage of the particular server
it occurs on. We are not sure what is triggering this
and what those Tomcat threads are waiting on [they
remain busy, waiting and unable to be reused by
Tomcat].

My questions are:
1. Has anyone else experienced this kind of Thread
explosion problem?
2. Is there a way to find out exactly what each Tomcat
Thread is doing/waiting for?
3. Is there a way to periodically clear Tomcat's
threadpool -- i.e. get rid of waiting/busy/unusued
threads.

We are working on ways to automatically restart Tomcat
once a certain # of threads is reached, but this is
not an acceptable solution, only a temporary
workaround of course.

Many thanks in advance



		
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Consulting Opportunity: Thread issues in Tomcat 5.0

[Matt Robinson <ma...@yahoo.com>]

Hi,

Forgive me if this is not the correct forum for
Tomcat-related opportunities.

We are looking for an experienced Java and Tomcat/IIS
developer who has a deep knowledge of Tomcat (ideally
5.0.28+) -- particularly in medium to high load
scenarios utilizing AJP13 connectors. We are located
in the San Francisco bay area (Palo Alto) and looking
for someone to work with us on-site to improve
threading performance, configuration optimization,
etc.

We are flexible in terms of working hours, but need to
work with this person on on-site in Palo Alto. We are
a successful, profitable startup with a core group of
developers and some happy, well-known customers.

Matt
matthewbrobinson@yahoo.com


		
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