VoD/P2P存储中的对等数据随机访问  

Equivalent data random access in peer-to-peer based video-on-demand systems

作　　者：沈时军[1] 李三立[1] 

机构地区：[1]清华大学计算机科学与技术系,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第5期754-757,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"十一五"计划专项预研项目

摘　　要：在基于对等网络的视频点播系统(VoD/P2P)中,由于用户请求分散、节点资源有限,存储策略的设计是一大难点。该文提出了一种存储策略——对等数据随机访问(EDRA),其核心是:面向流的视频分段、可无限扩展的冗余编码、可随机访问的对等数据。EDRA在提高视频可用性、均衡节点间负载、提高节点资源利用率、简化存储调度等方面有很好的性能。实验结果表明:EDRA非常适用于VoD/P2P存储系统,对节点带宽的利用率能比传统方案高出约89%。The storage design of a peer-to-peer based video-on-demand（VoD/P2P） system is challenging due to the asynchronous user requests and the limited node resources.A storage strategy called equivalent data random access（EDRA） was developed based on the ideas of stream-oriented video segmentation,limitless redundancy codes,and random access within equivalent data.EDRA can greatly improve the video availability,load balance,resource utilization and storage scheduling in a VoD/P2P system.Simulations show that EDRA is effective for VoD/P2P storage,with about 89% higher bandwidth utilization than conventional approaches.

关 键 词：对等网络 视频点播 冗余存储 

分 类 号：TP390.2[自动化与计算机技术—计算机应用技术]