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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%。
In VoD / P2P system based on peer-to-peer network, the storage strategy design is a difficult problem due to the fragmentation of user requests and the limited resources of nodes. This paper presents a storage strategy - Peer-to-Peer Random Access (EDRA) whose core is streaming-oriented video segmentation, infinitely extensible redundancy coding, peer-to-peer random access data. EDRA has good performance in improving video availability, balancing load among nodes, improving node resource utilization, and simplifying storage scheduling. The experimental results show that EDRA is very suitable for VoD / P2P storage system, and the utilization rate of node bandwidth is about 89% higher than the traditional scheme.