前切换:P2P共享文件备份技术研究  

Pre-switching:Research on P2P Shared File Backup Technology

作　　者：郑晓健 李彤[2] ZHENG Xiao-jian;LI Tong(School of Electrical and Information Engineering,Oxbridge College,Kunming University of Science and Technology,Kunming 650106,China;College of Dig Data,Yunnan Agricultural University,Kunming 650201,China)

机构地区：[1]昆明理工大学津桥学院电气与信息工程学院,云南昆明650106 [2]云南农业大学大数据学院,云南昆明650201

出　　处：《软件导刊》2021年第4期205-210,共6页Software Guide

基　　金：国家自然科学基金项目(61662085);云南省科技创新团队计划项目(2017HC012);云南省教育厅科学研究基金项目(2010C011)。

摘　　要：针对P2P节点自由退出和加入网络时产生访问节点资源文件失败问题,提出一种基于P2P共享文件资源备份的前切换算法。通过对网络节点存留时间预测,将资源文件节点的访问服务提前切换至备份节点,从而缩短了因系统服务节点的监测周期造成的检索服务盲区,减少访问失败事件发生。实验结果表明,该方法使访问失败事件发生率降至0.039%以下,远低于原有被动式切换方法的1%,提高了系统可用性及网络服务质量。In order to solve the problem of failure of accessing resource files when P2P nodes freely exit and join the network,a preswitching algorithm based on P2P shared file resource backup is proposed.Research shows that when the network node exits,the exist⁃ing system can not immediately discover and switch the retrieval resource service to the backup node.If the request for access to the nodes resource appears at the same time,the access operation will fail.By predicting the lifetime of network nodes,the pre switching algorithm can switch the service of resource file nodes to their backup nodes in advance,which shortens the blind area of retrieval ser⁃vice caused by the monitoring period of the system service node,and reduces the occurrence of access failure events.The experimental results show that this method reduces the incidence of the access failure events below 0.039%,far lower than 1%of the original passive switching method,and improves the system availability and network service quality.

关 键 词：P2P网络 文件共享 颠簸事件 前切换 节点存留时间 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]