English

应用科学学报

• 论文 • 上一篇    下一篇

基于性能测量的分布式CDN负载均衡策略

张国敏1 陈鸣1 丁科2 王娜3   

  1. 1 解放军理工大学 指挥自动化学院，江苏 南京 210007；

    2 全军网格研究中心，江苏 南京 210007；


    3 解放军理工大学 理学院，江苏 南京 211101

  • 收稿日期:2006-05-04 修回日期:2006-10-23 出版日期:2007-05-31 发布日期:2007-05-31

Load Balancing Policy of Distributed CDN Model Based on Performance Measurement

ZHANG Guomin1 CHEN Ming 1 DING Ke2 WANG Na3   

  1. 1 Institute of Command Automation, PLA University of Science and Technology, Nanjing 210007, China;

    2 PLA Research Center for Military Grid Technology, Nanjing 210007, China;

    3 Institute of Sciences, PLA University of Science and Technology, Nanjing 211101, China

  • Received:2006-05-04 Revised:2006-10-23 Online:2007-05-31 Published:2007-05-31

被引次数

5

摘要： 为了能够使CDN根据网络和服务器的性能变化实现真正的全局负载均衡，并使其摆脱服务器的单点故障对全局的影响。本文借鉴P2P网络在分布式文件共享及定位等方面的巨大成功，取消CDN中心，使各POP节点成为对等实体，从而提出了完全分布式CDN(DCDN, Distributed CDN)模型。重点研究了负载均衡和服务定位等关键技术，提出了基于网络测量和服务性能测量的MBPP算法。从而在提高CDN的扩展性和健壮性的同时，能够更加精确定位最佳服务提供点。试验表明，基于MBPP算法的负载均衡策略以较低的通信开销和运算复杂度实现了真正的全局实时动态负载均衡。

关键词: 分布式内容分发网络, 集群式服务提供节点, 负载均衡

Abstract: In order to make CDN implement real global load balancing based on network and server performance variance and avoid influence of single point failure in server, by borrowing the successful P2P techniques for distributed file sharing and locating, we design a pure distributed CDN model that has no central node. Thus all POP nodes are peers to each other. Key techniques such as load balancing and service locating are then studied in detail. A MBPP algorithm based on the network and service performance measurement is proposed. Scalability and robustness of CDN are improved, and the best service providing point can be located more precisely. Experiments show that, based on MBPP, global real-time dynamic load balance with small communication overhead and computing complexity can be achieved.

Key words: distributed CDN, cluster-POP, load balancing