node.js - how to create a room based on 2 users in socket.io? -

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my goal create 1 one chat based on 2 different users. way think of use socket.io rooms

but problem right how create unique room?

for example

socket.on('join', function(room) {    socket.join(room); });

do need emit room client, if , how make unique. imagine there thousands of users.

the chat application, similar facebook chat application. can chat 1 on one.

do need redis or mongodb store room? of have experience using socket.io in scale, please share opinion

thanks!

i tried minimal example of can in 1 room @ time (apart default socket.id room) , other sockets in same room receive messages. can change rooms.

the basic premise is, if socket in room 'xyz' , socket b, on server side can socket.to('xyz').emit('message', 'hello') socket a, , socket b receive message, connected socket c isn't in room 'xyz' won't.


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