一种P2P环境下分布式文件存储系统的缓存策略

在分布式文件存储系统中,缓存技术被广泛用于提高系统性能。论文针对P2P环境下分布式文件存储系统的特点,提出了一种兼顾用户访问效率和复本一致性的灵活的缓存策略,不同于目前已经存在的P2P存储系统,论文使用“阀值”来将文件区分为热点文件和非热点文件,并且只针对热点文件来做缓存,根据缓存空间的使用效率和不同的文件类型来设置不同的阀值使得缓存策略灵活而有效,论文对该策略进行了理论上的分析,然后通过Trace-Driven模拟的方法验证了该策略的可行性。

A Caching Strategy for P2P Distributed File Storage System

Caching technology is used widely in distributed file storage system to improve the system performance.We present a flexible caching strategy according the characteristics of P2P distributed file storage system.Our strategy not only chases better access performance,but also keeps higher consistency between all the replicas of a file than other strategies existing.We use ″threshold value″ to distinguish files into hot files and non hot files according to their accessed times and only the hot files will be cached.Through assigning different threshold values to different files according to the usage efficiency and the file type,our caching strategy performs better than others.This paper analyzes the caching strategy in theory and then proves its feasibility using Trace-Driven simulation.