I'm in the middle of a test right (~15min into it) now with 1250 users pounding the heck out of this thing and (knock on wood) there are no errors in the apache logs. Here are my settings:
<IfModule mpm_prefork_module>
StartServers 512
ServerLimit 2048
MaxClients 1250
MinSpareServers 25
MaxSpareServers 512
MaxRequestsPerChild 100000
</IfModule>
It seems if these setting aren't right it really messes with the proxy.
On the tomcat side the number of busy threads continue to grow. I still don't understand how I can go directly against tomcat and only consume ~160 busy threads and now its consuming ~1000 threads and is still climbing. Any ideas?
Thanks again,
J
----- Original Message ----
From: justin wright <juston_riteon@xxxxxxxxx>
To: users@xxxxxxxxxxxxxxxx
Sent: Wednesday, May 23, 2007 2:43:14 PM
Subject: Re: Re: High volume issues using mod_proxy (balancer,http,ajp) on Apache 2.2.4 across multiple tomcat 5.5.23 clusters - Configuration issues or bugs?
If worker == thread, I have 1500 max threads on the tomcat side. When I ran the test straight against the tomcat servers, they only consumed ~160 threads/tomcat instance. When I put apache in front of it, this number goes up to ~1100. The network is a gig ethernet and is only about 15% utilized. I have read about bugs with apache 2.2.x and mod_proxy where it doesn't reuse connections and eventually runs out, but I also read this bug was fixed. Any tips on debugging connections to tomcat or how would I find out if apache is getting bind exceptions when trying to connect to tomcat?
----- Original Message ----
From: Jim Jagielski <jim@xxxxxxxxxxx>
To: users@xxxxxxxxxxxxxxxx
Sent: Wednesday, May 23, 2007 2:27:16 PM
Subject: Re: Re: High volume issues using mod_proxy (balancer,http,ajp) on Apache 2.2.4 across multiple tomcat 5.5.23 clusters - Configuration issues or bugs?
On May 23, 2007, at 2:49 PM, justin wright wrote:
> I've set the apache confs to use the following
>
> StartServers 512
> ServerLimit 1024
> MaxClients 1024
> MinSpareServers 256
> MaxSpareServers 512
> MaxRequestsPerChild 100000
>
>
> I reran the test with a smaller load (350 users as opposed to
> 1250). It didn't hit the server limit but I still get this error:
>
> [Wed May 23 07:30:54 2007] [error] (70014)End of file found:
> ajp_ilink_receive() can't receive header
> [Wed May 23 07:30:54 2007] [error] ajp_read_header:
> ajp_ilink_receive failed
> [Wed May 23 07:30:54 2007] [error] (120006)APR does not understand
> this error code: proxy: read response failed from (null)
> (xxx.xxx.xxx.xxx)
>
>
That means that when ajp_ilink_receive() (actually ilink_read())
tried to read from the AJP socket, it rec'd an error.
Could be a network issue. Could be not enough workers on
the Tomcat side.
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