1 In part 1 , we discussed the horizontal scaling of the application layer – scaling out servers to handle the PHP code concurrently via load balancer..
2 The user accounts group doesn’t take that many reads or writes, at least not as many as the chats or games functions do, so we can make it smaller –..
3 The games need to be fast, so the largest group is used to make sure they’re served fast (both read and write operations), while the user account pa..