What to write chats like in VK?

Question

PHP

Planned attendance of the resource from ~2000 to ~50000.
1/3 of attendance is chatting like in VK.
Constant reconciliation with the base for new messages and notifications. (equal to 1/2 the attendance)
What is the easiest language to do this in?
Where to store data?
Based on php, mysql.

Answer 1

They did it on php + mysql - it turned out somehow not very well.
Changed to node.js + socket.io + redis + mysql (history) - it became noticeably better.

Answer 2

Look towards Erlang - ideal

Answer 3

I did this on node js + socket.io + mysql
Initially, I started in a bunch of node js + jabber, but I don’t remember why jabber was abandoned in the direction of mysql

Answer 4

I advise you to write on node.js and use mongodb for the base, but you can use sockets without them there will not be a special load, but you can wash and use the ready-made easyrtc module for node there and there is a message chat and video chat and other convenience and documentation is more or less normal

Answer 5

yes it is possible in mysql. In general, somehow there was an idea to raise a jabber server and use it as a chat of personal correspondence.

Answer 6

Use ReactPHP

Answer 7

Front - NodeJS is now fashionable to write for this. Backend - correctly advise on erlang. And it’s better not to show off and use ejabberd inside, which clusters out of the box.

Answer 8

I support the previous commentators and add: on the client, I advise you to use any available framework (Angular, Bootstrap, etc.)
Because without it, doing something complicated on the client will be a hassle.