Unstructured P2P has power-law link distribution, and the random walk in power-law networks is analyzed. The analysis results show that the probability that a random walker walks through the high degree nodes is high ...Unstructured P2P has power-law link distribution, and the random walk in power-law networks is analyzed. The analysis results show that the probability that a random walker walks through the high degree nodes is high in the power-law network, and the information on the high degree nodes can be easily found through random walk. Random walk spread and random walk search method （RWSS） is proposed based on the analysis result. Simulation results show that RWSS achieves high success rates at low cost and is robust to high degree node failure.展开更多
无结构P2P网络拓扑随着规模的增大会出现一定的统计特性,充分应用该现象提出了一种多级局部覆盖网络(multi-level local overlay,简称ML2O)的无结构P2P覆盖网,对ML2O中节点间的连接进行恰当的数学控制后,就能使产生的拓扑具有从微观到...无结构P2P网络拓扑随着规模的增大会出现一定的统计特性,充分应用该现象提出了一种多级局部覆盖网络(multi-level local overlay,简称ML2O)的无结构P2P覆盖网,对ML2O中节点间的连接进行恰当的数学控制后,就能使产生的拓扑具有从微观到宏观的多个粒度上的局部性.理论分析表明,ML2O的网络直径和节点平均度都是网络规模n的对数,为其上建立可扩展的无结构P2P搜索奠定了基础.给出了应用ML2O多粒度局部特性的索引机制:首先以局部为单位建立信息索引;然后在局部索引的基础上建立更大粒度局部的索引,从而形成一棵索引树;最后提出了一种局部渗透定向搜索算法(local pervasion and directed search,简称LPDS).LPDS用局部渗透收集到的信息建立部分索引树,并在树上找到更接近搜索目标的下一跳.理论分析表明,LPDS搜索算法的平均搜索跳数和通信负载都是O(logn).模拟实验结果表明,ML2O上LPDS的可扩展性接近结构化P2P搜索,其鲁棒性接近无结构P2P搜索.展开更多
文摘Unstructured P2P has power-law link distribution, and the random walk in power-law networks is analyzed. The analysis results show that the probability that a random walker walks through the high degree nodes is high in the power-law network, and the information on the high degree nodes can be easily found through random walk. Random walk spread and random walk search method （RWSS） is proposed based on the analysis result. Simulation results show that RWSS achieves high success rates at low cost and is robust to high degree node failure.
文摘无结构P2P网络拓扑随着规模的增大会出现一定的统计特性,充分应用该现象提出了一种多级局部覆盖网络(multi-level local overlay,简称ML2O)的无结构P2P覆盖网,对ML2O中节点间的连接进行恰当的数学控制后,就能使产生的拓扑具有从微观到宏观的多个粒度上的局部性.理论分析表明,ML2O的网络直径和节点平均度都是网络规模n的对数,为其上建立可扩展的无结构P2P搜索奠定了基础.给出了应用ML2O多粒度局部特性的索引机制:首先以局部为单位建立信息索引;然后在局部索引的基础上建立更大粒度局部的索引,从而形成一棵索引树;最后提出了一种局部渗透定向搜索算法(local pervasion and directed search,简称LPDS).LPDS用局部渗透收集到的信息建立部分索引树,并在树上找到更接近搜索目标的下一跳.理论分析表明,LPDS搜索算法的平均搜索跳数和通信负载都是O(logn).模拟实验结果表明,ML2O上LPDS的可扩展性接近结构化P2P搜索,其鲁棒性接近无结构P2P搜索.
