Hi, we have one Apache-2.2.13 running mod_proxy_ajp + mod_proxy_balancer, connected to (3) Tomcat-6.0.20 instances under Fedora release 8. We are experiencing some issues with high CPU load on the Tomcat side, and Apache starts logging errors like these
[Fri Oct 30 14:47:43 2009] [error] (70007)The timeout specified has expired: ajp_ilink_receive() can't receive header [Fri Oct 30 14:47:43 2009] [error] ajp_read_header: ajp_ilink_receive failed [Fri Oct 30 14:47:43 2009] [error] (120006)APR does not understand this error code: proxy: read response failed from On Tomcat side we are using the APR Native Connector, with this settings: <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" maxThreads="130" backlog="10" connectionTimeout="30000" keepAliveTimeout="30000" enableLookups="false" /> Apache MPM conf: ServerLimit 100 <IfModule mpm_worker_module> StartServers 30 MaxClients 2500 MinSpareThreads 50 MaxSpareThreads 100 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> mod_proxy_ajp conf: <Proxy balancer://jogacraque> BalancerMember ajp://xxx.xxx.xxx.xxx:8009 route=app01 ttl=30 max=2 BalancerMember ajp://xxx.xxx.xxx.xxx:8009 route=app02 ttl=30 max=2 BalancerMember ajp://xxx.xxx.xxx.xxx:8009 route=app03 ttl=30 max=2 </Proxy> Apache specs: Server version: Apache/2.2.13 (Unix) Server built: Sep 29 2009 11:12:35 Server's Module Magic Number: 20051115:23 Server loaded: APR 1.3.8, APR-Util 1.3.9 Compiled using: APR 1.3.8, APR-Util 1.3.9 Architecture: 32-bit Server MPM: Worker threaded: yes (fixed thread count) forked: yes (variable process count) I've beeng testing different settings for mod_proxy_ajp, but I am not sure what is the exact relation between the max option for mod_proxy and ThreadsPerChild. Should I set max to 1? I understand I would have as many connections to each Tomcat box as max*(MaxClients/ThreadsPerChild), is this correct? BTW, is the total number of connections that mod_proxy_ajp will forward to Tomcat related with MaxThreads ? I don't fully understand how APR connector works in this case. Thanks in advance, -Damian Traverso --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org " from the digest: users-digest-unsubscr...@httpd.apache.org For additional commands, e-mail: users-h...@httpd.apache.org
