Hi Rainer,
Apache:
Server version: Apache/2.0.55
Server built: Mar 5 2007 11:10:17
Server's Module Magic Number: 20020903:11
Yes, we are thinking about updating the Java, I was in the process of
checking the release notes to see if anything specific was mentioned.
Mod JK:
mod_jk/1.2.15
Worker or prefork MPM? - I don't understand the question, sorry.
<Connector port="8009"
enableLookups="false" redirectPort="8443"
protocol="AJP/1.3"
acceptCount="50"
minSpareThreads="240"
maxThreads="950"
backlog="50"
address="127.0.0.1"
debug="0"
/>
Tomcat is installed on the same machine as Apache.
With respect to the number of connections to the tomcat port I can't
give a complete answer - looking at the crash I can see there are around
4000 stuck at TIME_WAIT. Another 30 or so are at ESTABLISHED.
The mod jk configuration:
## THIS FILE MAY BE OVERRIDEN AT RUNTIME. MAKE SURE TOMCAT IS STOPED
## WHEN YOU EDIT THE FILE.
## COMMENTS WILL BE _LOST_
## DOCUMENTATION OF THE FORMAT IN JkMain javadoc.
# Set the desired handler list
# handler.list=apr,request,channelJni
#
# Override the default port for the socketChannel
# channelSocket.port=8019
# Default:
# channelUnix.file=${jkHome}/work/jk2.socket
# Just to check if the the config is working
# shm.file=${jkHome}/work/jk2.shm
# In order to enable jni use any channelJni directive
# channelJni.disabled = 0
# And one of the following directives:
# apr.jniModeSo=/opt/apache2/modules/mod_jk2.so
# If set to inprocess the mod_jk2 will Register natives itself
# This will enable the starting of the Tomcat from mod_jk2
# apr.jniModeSo=inprocess
bash-3.00# cat ./callflow-server/webserver/conf/workers.properties
workers.apache_log=/usr/local/apache2
workers.tomcat_home=/opt/tomcat
workers.java_home=/usr/j2se/
worker.list= worker1
worker.worker1.type=ajp13
worker.worker1.host=127.0.0.1
worker.worker1.port=8009
worker.worker1.lbfactor=2.5
# Number of concurrent users.
worker.worker1.cachesize=950
worker.worker1.cache_timeout=600
worker.worker1.socket_timeout=300
Yes, I agree with you about contacting SUN, I'm digging out our service
plan at the moment.
Damien
-----Original Message-----
From: Rainer Jung [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 06, 2007 3:42 PM
To: Tomcat Users List
Subject: Re: mod_jk errors and http status code 503 under load
Damien Corbishley wrote:
> Hi,
>
> I'm getting stuck with an error we are seeing on our production
> server under load.
>
> We upgraded our combination of Apache,Tomcat,Java all running on
> Solaris 10 to
>
> Apache 2_2.0.55.build2
This doesn't sound like a real Apache httpd version. You can check the
real version with "httpd -V" or when using log level info in the error
log of httpd.
Worker or prefork MPM?
> Tomcat 5.5.23
>
> Java 1.5.0_06-b05
If you are in a general update situation, switch to 1.5.0_12 or whatever
seems to be recent and not only a couple days old.
And finally mod_jk-version?
> Our Apache Tomcat connector is AJP/1.3.
What's the configuration of the connector element in server.xml?
> It's all installed on the same server, we have no tomcat clusters and
> no load balancers.
>
> With a few (10) concurrent users accessing the various JSP's
> everything worked as expected, all our functional tests passed.
>
> We opened more up live traffic to the server and starting seeing the
> following error message:
>
> [Thu Sep 06 02:23:00 2007] [error] ajp_service::jk_ajp_common.c
> (1758): Error connecting to tomcat. Tomcat is probably not started or
> is listening on the wrong port. worker=worker1 failed
Is Tomcat on the same machine, or on another one?
What do you get for "netstat -an| grep TOMCATPORT" where you replace
TOMCATPORT with the port number your Tomcat AJP connector listens on?
How many ESTABLISHED, how many of other states (SYN_SENT, CLOSE_WAIT
etc.)?
What's you mod_jk configuration?
> On the client side this was being reported as a 503 and our
> "intelligent" browser was re-submitting the request and generally,
>
> on the second time, the request would be successful.
>
> After an hour we then had a Solaris panic, and after analyzing the
> crash using scat I can see that the cause was:
Solaris panic looks very bad. I would definitely open a bug with sun.
I'm not saying that the original problem is there, but it is very
unusual, that the whole system panics.
> panic string: BAD TRAP: type=9 rp=2a1015332d0 addr=0 mmu_fsr=0
>
> and looking further into the trap, it seems to be network related.
>
> <trap>ip:tcp_conn_request+0x894 (0x4, 0x2000, 0x136ec00,
> 0x3a2b9a44040, 0x40e03960300, 0x40dedc247c0)
>
> ip:squeue_drain+0xe4 (0x300015ddec0, 0x40e2021c1c0, 0x411666de,
> 0x135f2c0, 0x3a2b9a44040, 0x3)
>
> ip:squeue_enter+0x358 (0x300015ddec0, 0x38fca5e0d80, 0x3000426b640,
> 0x3a2bd674c00, 0x0, 0x1)
>
> ip:tcp_wput - frame recycled
>
>
>
> I am still trying to work out if the crash is a symptom of the
> browsers resubmitting the failed requests and we've hit a Solaris bug
> that we haven't got a patch for,
>
> Or if the two errors are unrelated and it was coincidence that we
> panicked whilst having mod_jk errors.
>
>
> Any help/pointers in resolving the mod_jk error would be appreciated,
> I included the brief crash information as it may be relevant.
>
> Thanks
>
> Damien
Regards,
Rainer
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