一种内容分发网络中的快速复制方案

由于在内容分发网络中．将大文件从一台服务器复制到其他服务器需要耗费大量的时间。本文首先对内容分发网络中的复制问题进行了形式化描述，然后提出了一种分布式的方案NCOM，用于减小复制时间。方案的创新性在于，NCOM在CDN中构建一个Mesh结构，利用多路径传输数据块，提高速率；同时也利用Network Coding技术来避免需要从不同路径调度不同数据块所带来的协调开销。实验结果表明，与现有方案相比，NCOM可以显著减小复制时间。

Achieving Fast Data Replication in Content Distribution Networks

It is time-consuming to replicate large-size files to a large number of edge servers in content distribution network. In this paper, a distributed scheme NCOM is proposed to provide fast data replication. Starting from problem formulation, NCOM is designed to organize the edge servers into an overlay mesh and propagate the packetized data blocks in the mesh. The novelty of this scheme lies in that network coding is introduced to alleviate the block coordination between edge servers during data propagation. NCOM is evaluated by simulations, which shows that the introduction of network coding to content distribution brings significant benefits in reducing replication time.