确保一个独特的套接字。使用socket.io对多个应用程序实例进行标识

I am running a Node.js + Socket.io app over multiple instances with a Redis cache layer. I am wondering if the socket.id field for each connection would be unique over all instances. Is there a possibility that a socket.id on one instance can be the same as socket.id on another instance?I am running a Node.js + Socket.io app over mul