Research on Adaptive Content Delivery Networks to Follow Internet Load Dynamically

随着信息的快速传播和浏览器的无所不在，网络拥塞现象已经成为互联网上最严重的问题之一。称为内容交付（或分发）网络的技术就是为了解决这个问题。然而，目前的cdn是静态的，不能适应负载的动态增减。我们的研究旨在设计和实现具有自主拓扑重组的自适应动态CDN。它根据一组缓存代理的需求组织点对点网络，从而吸收服务器不断增加的负载。我们设计了一些新的组件技术：(a)网络转换，(b)点对点共享和合作，(c)自动访问重定向，(d)内容复制，以及(e)它们的集成。然后我们实现了它们的原型实现和性能评估，证明了我们设计的优势。我们的系统在负载增加时从正常的客户机/服务器网络过渡到点对点共享网络，并在需要时扩大点对点网络，解决冲突并与其他相邻的点对点网络合作。

With the rapid spread of information and ubiquitous accesses of browsers, congestion phenomena on the Internet have become one of the most serious issues. The technique called Content Delivery (or Distribution) Networks is to address this issue. However, corrent CDNs are static and unable to adapt to the increase or decrease of the load dynamically. Our research has aimed at desining and realizing an adaptive dynamic CDN with autonomous topology reorganization. It organizes a peer-to-peer network on demand from a group of cache proxies, which absorbs an increasing load to a server. We designed some new component technologies: (a) transition of networks, (b) peer-to-peer sharing and cooperation, (c) automatic access redirection, (d) content replication, and (e) their integration. Then we achieved their prototype implementations and performance evaluations, which prove advantages of our designs. Our system transits from a normal client/server network to a peer-to-peer sharing network when the load increases, and enlarges the peer-to-peer network if needed, with conflict resolution and cooperation with nother neighboring peer-to-peer networks.