面向新媒体广播的云CDN系统

互联网用户的快速增长使得流媒体访问需求不断增加，庞大的流媒体访问需求和有限的服务器分发能力，造成了系统响应慢、用户体验下降等问题.针对以上问题，结合新媒体广播项目中流媒体分发的实际应用，提出了一种基于云计算的流媒体分发系统，主要利用云计算的分布式处理和CDN（Content Distributed Network）分发系统来使用户能够就近访问所需资源，在保证流媒体分发质量的同时提高分发速度，降低企业成本改善用户访问体验.本文主要阐述了面向新媒体广播的云CDN系统的总体框架和主要功能，具体介绍了借助于Hadoop实现的客户端测速技术以及基于用户访问行为的缓存策略.

CDN System Based on Cloud Computing for New Media Broadcasting

The rapid growth of the number of Internet users makes the visiting requirements of streaming media continue to increase, the huge demand for streaming media access and the limited ability of servers to distribute streaming media cause some problems, such as slow system response and the decrease of user experience. To solve these problems and apply the solution to the New Media Broadcasting the CDN system based on cloud computing is proposed, it mainly uses cloud computing and CDN to enable the users to access the nearest required resource, to ensure the quality while it increases the distribution speed of streaming media and reduce costs to improve user experience. This paper mainly describs the structure and major functions of the CDN system based on cloud computing for New Media Broadcasting, specifically introduces the client speed measurement technology by means of Hadoop and a caching technology based on user behavior.