Apache mod_proxy sticky session not working occasionally

Question

We are having four Tomcats load balanced with Apache mod_proxy (mod_ajp). mod_proxy is configured as follow, lbmethod=byrequests and sticky_session enabled. But occasionally we have noticed that apache is not honoring sticky session. i.e. Apache is sending the request that is supposed to be received by Tomcat 1 to Tomcat 2, thus resulting in the user losing the authentication. Will mod_proxy always honor sticky session or not, if not what are the scenarios it will disregard sticky session setting.

UPDATE:

Proxy config in httpd.conf

<Proxy balancer://app-lb>
     BalancerMember ajp://10.**.**.**:5009/app min=1 max=300 route=r1 loadfactor=1 timeout=300 KeepAlive=On
     BalancerMember ajp://10.**.**.**:5010/app min=1 max=300 route=r2 loadfactor=1 timeout=300 KeepAlive=On
     BalancerMember ajp://10.**.**.**:5011/app min=1 max=300 route=r3 loadfactor=1 timeout=300 KeepAlive=On
     BalancerMember ajp://10.**.**.**:5012/app min=1 max=300 route=r4 loadfactor=1 timeout=300 KeepAlive=On
     ProxySet lbmethod=byrequests
</Proxy>
ProxyPass /app  balancer://app-lb stickysession=JSESSIONID

Connector config in server.xml

<Connector port="5011" protocol="org.apache.coyote.ajp.AjpNioProtocol" keepAliveTimeout="30000" connectionTimeout="30000" redirectPort="8443" maxPostSize="10485760"/>

at least share the config in Apache and the jvmroute values you set in tomcat, otherwise you are asking people to guess. — Daniel Ferradal, Mar 11 '18 at 19:25
route value must be set to the same value that you set "jvmroute" in tomcat, you don't seem to have a jvmroute value set in tomcat, or you don't show. — Daniel Ferradal, Mar 12 '18 at 12:23

Apache mod_proxy sticky session not working occasionally

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