Given instances 1, 2, and 3, we create a converged app with an http session that
is active on 1 and replicated to 2. Instance 1 goes down and the app is accessed
on instance 2 – so the session is active on 2 and replicated on 3. Instance 1
comes back, and now attempts to find the http session fail.
In this case, instance 1 has an expat list that says to load the session from
instance 2. But ReplicationManagerBase.processUnicastfindsession consults only
the replica cache and not the active cache, so instance 2 fails to find the
session. The unicast load needs to consult the active cache (in the same way
that processBroadcastfindsession already does).