On 05.09.2009 11:02, Joseph2009 wrote:
I am using Tomcat 5.5.20 and Apache 2.2 with Mod_jk 1.2.2.7 on Solaris 10
intel platform. Following is my configurations
Tomcat
port=8030
enableLookups=false
redirectPort=8444
protocol=AJP/1.3
compression=on
compressableMimeType=text/html,text/xml,text/css,text/javascript
maxThreads=250
maxSpareThreads=75
minSpareThreads=25
connectionTimeout=60
Apache
IfModule mpm_prefork_module
StartServers 10
MinSpareServers 10
MaxSpareServers 20
MaxClients 200
MaxRequestsPerChild 0
/IfModule
mod_jk
worker.template.type=ajp13
worker.template.lbfactor=1
worker.template.ping_timeout=1000
worker.template.ping_mode=A
worker.template.socket_timeout=10
worker.template.connection_pool_timeout=600
worker.anznz.reference=worker.template
worker.anznz.host=localhost
worker.anznz.port=8030
My website is running fine for the entire day and mod_jk started throwing
the following error end of the day
[Sat Sep 05 11:27:05 2009][23566:1] [error] jk_ajp_common.c (2400): ()
sending request to tomcat failed (unrecoverable), (attempt=1)
[Sat Sep 05 11:27:04 2009][7724:1] [info] jk_ajp_common.c (1104): ()
can't receive the response message from tomcat, tomcat (127.0.0.1:8030) has
forceda connection close for socket 36
[Sat Sep 05 11:27:05 2009][7724:1] [error] jk_ajp_common.c (1920): ()
Tomcat is down or refused connection. No response has been sent to the
client (yet
)
Once the abouve error hits, the user get the service not available pages. It
is not happening to all users. Then when I restart the Tomcat, it started
working. There is no problem in accessing the site through the HTTP
connector in the Tomcat.
Did someone experience similar problem and is there any solution for this
problem?
Maybe you run out of Tomcat threads because requests start hanging and
slowly your thread pool gets exhausted. Try to do a few (like 3) thread
dumps, each a few (like 3) seconds apart form each other.
Thread Dump: kill -QUIT to the Tomcat PID. It writes a list of all
thread to catalina.out, together with their stack, i.e. what code they
are running at that moment).
Regards,
Rainer
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