emp架构

https://wenku.baidu.com/view/5fac8d037e21af45b207a852.html

https://wenku.baidu.com/view/f2faa36fa45177232f60a2dd.html?sxts=1554259473247

https://wenku.baidu.com/view/636c3a29680203d8cf2f242e.html?sxts=1554259493282