Service Discovery
http://www.oschina.net/translate/smartstack-service-discovery-cloud
http://www.jianshu.com/p/771240b3668d
http://owenyang0.github.io/2015/05/08/2-minute-introduction-to-Rx/
http://www.infoq.com/cn/news/2013/01/netflix-hystrix-fault-tolerance
http://www.juvenxu.com/2014/03/19/improve-system-availability-with-hystrix/
http://nirmata.com/2014/08/getting-started-with-microservices-using-netflix-oss-docker/