I am experiencing a periodic mod_jk failure which leads to a 503 site error. I can netstat to Tomcat on port 8009 during these failures, so I suspect that there is an issue with the apache => tomcat threads. I have yet to find a culprit thread in a Tomcat stack trace dump.
OS: Ubuntu 10.04
Web Server: Apache2
App Server: Tomcat6
Error from mod_jk.log:
ajp_connect_to_endpoint::jk_ajp_common(c) (922): Failed opening socket to (127.0.0.1:8009) (errno=111)
I think it could be an issue with number of connections between apache and tomcat.
In tomcat you can add acceptCount attribute for the <Connector>. The defintion of that attribute is "The maximum queue
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