如何设计可伸缩的rpc调用侦听器?

I have to listen for rpc calls , stack them somewhere , process them, and answer. The thing is that they are not run as soon as they come. The response is an ACK for each rpc call recieved. The problem is that i want to design it in a way that i can have many listening servers writing in the same stack of calls, piling them up as they come.I have to listen for rpc calls , stack them som