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mod_wl_ohs is similar to the mod_wl plug-in, which you can use to proxy requests from Apache HTTP Server to Oracle WebLogic server.
Please see the below doc : http://docs.oracle.com/cd/E23943_01/web.1111/e10144/under_mods.htm#BABGCGHJ
Section : 3.11 mod_wl_ohs
And as per the below Doc :
Section : Failover, Cookies, and HTTP Sessions
Session Stickness is default property for Proxy Plug-in.
it answers to my question.
So to summarize :
- OHS manages sticky session by default (initialy thrugh round-robin) if a cluster is targeted
- in OHS WLCookieName param let redefine the name of the Session ID if needed
- Session replication can be disabled from weblogic.xml in the webapp
- If session replication is not required, it is recommended to not create a WLS cluster in order to avoid useless multicast traffic as well as turn off session replication automatically