本文先是对云计算的概念进行了简要概述,接着描述了云计算的服务层次,之后重点对包括Google App Engine、Hadoop、Windows Azure在内的三种典型PaaS平台技术架构进行了深层次的解刨。文章在介绍三种典型的PaaS平台时采用了纵向分层横向介绍的方法,先将PaaS平台按技术架构由底层到顶层分层,之后在介绍各层的具体实现技术时又将三大PaaS平台在这层的技术并列介绍,以对各大关键技术充分掌握。 This article first gives a brief overview of the concept of cloud computing, then describes the cloud computing service level, and then focus on the three typical PaaS platform technology architecture, including Google App Engine, Hadoop, Windows Azure, . The article introduced three typical PaaS platforms using the method of horizontal and vertical layering. Firstly, the PaaS platform was layered from the bottom to the top according to the technical architecture. After introducing the specific implementation technologies of each layer, the three PaaS platforms The technologies at this level are introduced side by side in order to fully grasp the key technologies.