What is com.reuters.rfa.session equivalent in EMAConfig? Is it Consumer? Can someone please clarify?
There is no strict 1:1 mapping of RFA config elements and EMA Config elements.
But you could say that Consumer is related to Session - since Session config references a ConnectionList and Consumer config references Channels or ChannelSets.
I recommend you read my Intro article on EMA Config - EMA - Configuration Overview - which should provide a high level view.