缓存与迁移策略下对等网络节点负载控制算法

在非结构化对等(P2P)网络中，节点“搭便车”行为以及用户查询不均匀会造成网络节点负载分布严重失衡。为此，提出一种节点负载控制算法，采用缓存和链路迁移策略，将重载节点中的剩余负载向其他轻载节点转移，同时在链路节点中缓存网络中的热门文件资源。实验结果表明，在用户查询服从Zipf分布的环境下，该算法能使网络中节点负载达到较好的均衡，降低系统整体负载。

Node Load Control Algorithm Based on Cache and Migration Strategy in Peer-to-Peer Network

In the unstructured Peer-to-Peer（P2P） network,free-riding behavior and distributed file request cause node load degree balanced.This paper proposes a link migration and cache strategy to transfer extra load from heavy-load nodes to light-load nodes,also caches hot files to link nodes.Simulation shows that,when query requests in the network conforms to Zipf distribution,the link migration and cache strategy can make network nodes more balanced and also reduce whole system load.