Master/master looks good on paper and glossy product hand-outs, but it doesn't work out well in production. You'll find every case or performance problem that c

Master/master looks good on paper and glossy product hand-outs, but it doesn't work out well in production. You'll find every case or performance problem that causes it all to break horribly. Facebook doesn't do master-master on their MySQL instances. It's all master-slave(s). Why? Because it works, it's reliable, and it's easy to change masters quickly when you have Facebook's automation infrastructure.