MaxRequestsPerChild - New child process doesn't process requests (Apache Users)

Hi,

We are having an issue with Tomcat application accessing through proxy and details are below. Can you please check and share your feedback.

Issue:

We have an application(tomcat) accessed through proxy as below. Also, we have MaxRequestsPerChild setting as 100

Whenever MaxRequestsPerChild reached its limit, a new process is started but the application become unresponsive. It seems that new process doesn’t service any requests

We have to restart httpd to recover that

Log:

- Access.log doesn’t show any requests for new child

- Error_log shows that

a) workers are initiated for new process but it didn’t service any requests

c) processing has stuck for a minute due to some reason

[Fri Aug 08 16:09:17 2014] [debug] ssl_engine_kernel.c(2118): [client 127.0.0.1] Certificate Verification, depth 0 [subject: /C=y/ST=y/L=y/O=y/OU=y/CN=y, issuer: /C=y/ST=y/L=y/O=y/OU=y/CN=y, serial: xyz]

[Fri Aug 08 16:10:12 2014] [info] [client 10.150.90.25] Connection to child 6 established (server *:<port number from client>)

d) SSL handshake has started but didn’t complete for 4 connections related to new process. There are no errors related to ssl

$ grep -i handshake errorlog.2014-08-08-07_06_44 | grep -c start

707

$ grep -i handshake errorlog.2014-08-08-07_06_44 | grep -c done

703

Apache version:

2.2.15

Proxy setting:

SSLProxyEngine On

SSLProxyCipherSuite ALL

SSLProxyMachineCertificateFile /var/ssl/proxy.pem

proxyPass /app1 https://localhost:<port number>/app1 (Tomcat)

Worker configuration:

KeepAlive On

MaxKeepAliveRequests 100

KeepAliveTimeout 15

StartServers 1

MaxClients 25

MinSpareThreads 12

MaxSpareThreads 25

ThreadsPerChild 25

ServerLimit 1

MaxRequestsPerChild 100

MaxMemFree 50

</IfModule>

Thanks & Regards,

Krishna