Abstract: Current P2P Web caching system caches too many duplicates in the system. To solve the problem, an enforced hybrid caching system named HCache was proposed. HCache can reduce the duplicates, by choosing which objects should be cached due to the user's access characteristic and Web priority. The popularity of the Web object was used to improve the LRU replacement (called ELRU), which enhanced the ratio of the P2P Web caching system. In the trace-driven simulation, the result shows that HCache achieves better hit ratio and performance.

Key words: cache, peer-to-peer, hybrid, Least Recently Used (LRU)

摘要： 针对当前P2P Web 缓存系统中副本过多的问题，提出了一种有效的混合式P2P Web缓存系统：HCache。HCache根据用户对网页的访问特点及网页的优先级，对网页进行有选择的缓存，进而减少P2P Web缓存系统中的副本个数。根据Web对象当前的流行度，对LRU替换策略进行了改进(ELRU)，提高了P2P Web缓存的命中率。在日志驱动的模拟实验表明，HCache缓存系统提高了Web缓存的命中率和性能。

关键词: 缓存, P2P, 混合式, LRU