Hi David,
dave.smith schrieb:
Hi Rainer,
Thanks a lot for the reply.
I am using Tomcat 5.5.25 (rpm from jpackage.org). CentOS Linux 2.6.18.
httpd was compiled in prefork mode. The prefork settings are:
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 256
MaxClients 256
MaxRequestsPerChild 4000
I have setup JMeter to run against a test environment, but was unable to
reproduce. These random responses occur in production about once every week
or so/more. The problem will often (temporarily) correct itself, but
sometimes I will need to restart httpd if the problem persists -- restarting
tomcat also works to temporarily correct the problem.
The only thing strange that I see in my logs are in the test_client.log:
WARNING: Exception thrown whilst processing POSTed parameters
java.io.IOException: Socket read failed
at
org.apache.coyote.ajp.AjpAprProcessor.read(AjpAprProcessor.java:1037)
...
Thanks for the information. What is "test_client.log"? It looks like a
Tomcat log file? Could you also post a larger part of the stack, or do
you only get one line?
Would you be able to do the following two things, maybe not both at the
same time:
- disable the apr connector (tcnative.so)
- upgrade jk to 1.2.26
Concerning the apr connector: If you are using OpenSSL with apr and
Tomcat or you have some similar reason you really need it, then don't
switch. But if you use it without a very specific reason, disabling it
for a week or two would help us isolate the problem.
Concerning mod_jk upgrade: That should be very easy, apart from the
following: if your httpd uses VirtualHost in the configuration, you have
to include your JkMount inside the VirtualHost, not in the global part,
or you add JkMountCopy On to the VirtualHost.
Regards,
Rainer
Rainer Jung-3 wrote:
dave.smith schrieb:
Wow. That's weird. Is Tomcat serving the file, or is httpd serving it?
Not too weird. I am experiencing the same thing with Tomcat 5.5 and
mod_jk
1.2.23. I have Tomcat serving everything.
I am also using a load balancer that sends an OPTION every 2 seconds to
each
web server to make sure that the server is alive.
This intermittent random response issue is really killing me.
Could you please also add some info:
Tomcat version?
And from my previous mail:
What's you platform and which httpd MPM (prefork orworker or something
else) do you use? For some platforms (e.g. AIX) the detection of
multi-threading in httpd during mpod_jk build-time was broken. Starting
with 1.2.24 we build always including multi-thread support unless
explicitely stated via a configure option. If you 1.2.23 build is not
thread safe, but your httpd uses threads (like with worker mpm), then
such trouble is possible, although more likely you would see crashes
etc. For most platforms like Linux and Solaris the threading detection
was OK already before 1.2.24.
Another possible (but not very likely) cause could be bug 44494 of
Tomcat 6.0.16/5.5.26 which under certain circumstances could leave data
in the request object after request handling completed. You could try
either downgrading to 6.0.15/5.5.25 or upgrading to the soon to be
expected 6.0.17/5.5.27.
I would also add the access log on the Tomcat side. If you find the same
phenomenon there, then it's unlikely, that httpd/mod_jk are responsible
and the reason should be inside Tomcat or the webapp.
Can you reproduce the problem on a test system?
Regards,
Rainer
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