Chetan,
We had similar issue with Sun solaris and weblogic.
My system admin found out there is a socket read errors are going on . He
used snoop command in solaris. After tuning the TCP parameters the issue got
resolved.
You might also need to something like that.
Thanks
Krish
On Wed, May 13, 2009 at 11:57 AM, Chetan Chheda chetan_chh...@yahoo.comwrote:
I guess I need to ask my question again. Im primarily an HP-UX
administrator and recently inherited this web based application ...
We are having some issues in accomodating additional user
load/functionality. While a part of the team is looking at optimizing code,
I am responsible for infrastructure componants.
One particular focus area for me is the mod_jk and tomcat configurations.
1. Last of April saw one of the tomcat's stop processing requests. Looking
at the mod_jk.log I saw the following errors
Unable to get the free endpoint for worker XXX from 37 slots
I have setup the status servlet for mod_jk in which I saw that max slots
were opened. Thinking that mod_jk needs more number of connections, I
basically set it to ThreadsPerChild from worker MPM
2. Now we are randomly seeing that even a simple activity as user login
causes a spike in used tomcat connector threads. Eventually all tomcat
threads are used and no new requests can be serviced.
So, long story short, is my apache, mod_jk and tomcat configuration in
sync?
Maxclients = 512
ThreadsPerChild = 256
So that means 2 server processes with 256 threads each.
I have 2 worker threads in my worker.properties file with
connection_pool_size=256.
Does this mean that total number of connections into tomcat = 256 *
2(number of workers) * 2(number of server procs) = 1024 ??
Do I need to change the connection_pool_size to 120 . Which means 120*2 *2
= 480 and that leaves the remainder of apache threads for static content?
3. I have worker.XXX.cache_timeout=900 and no connectionTimeout in
server.xml . Is this why connections remain open?
Thanks,
Chetan
From: Caldarale, Charles R chuck.caldar...@unisys.com
To: Tomcat Users List users@tomcat.apache.org
Sent: Tuesday, May 12, 2009 10:47:00 PM
Subject: RE: Tomcat not closing threads
From: Chetan Chheda [mailto:chetan_chh...@yahoo.com]
Subject: Re: Tomcat not closing threads
I managed to get a thread dump during one such tomcat hangs. Most of
the threads are in the following status ...
The ones you show are simply waiting for input from httpd; that's a pretty
normal state. When looking at a thread dump, it's often the oddball thread
that's not doing what the rest are that is causing a problem. However, if
all of the threads are just waiting to receive something from httpd, then
you may have to look outside of Tomcat for the cause.
- Chuck
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