对等网络副本最佳占有率缓存管理策略

Replica-optimized P2P Cache Management Strategy

随着对等网络应用的不断深入,如何减少时间延迟,减轻集中性带宽负载,提高服务质量,已经成为研究的一个重点。提出了CORPC缓存管理方案。该方案通过使用流媒体片段的流行度来定义媒体片段副本数可占用的最佳系统缓存容量,综合考虑流媒体片段已有的副本容量、流媒体片段的热度、系统节点存储容量,使用启发式贪婪算法来实现缓存准入和缓存替换机制。该方案兼顾了不同热度的媒体片段的服务质量。模拟环境的测试结果表明,随着节点缓存空间的增加,系统服务质量得到改善。

According to the in-depth research on PAP stream media application, how to improve quality of service is a main aspect in research work. We proposed a CORPC caching management scheme,which defines a best caching capacity of chunk＇s replicas in a PAP system. Based on media chunk popularity, replica number and peer capacity, CADRPC scheme adopts heuristic greedy algorithm to implement cache admission control and replacement policy. This scheme can improve quality-of-service （QoS） of chunks with lower popularity while with little scrifice of chunks with high popularity. Experiment results show that system QoS is improved obviously with an increase of peers＇ cache capacity.