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Journal of Software:2011.22(9):2104-2120

利用多级局部性实现可扩展的无结构P2P 搜索
李治军,姜守旭,李晓义
(哈尔滨工业大学 计算机科学与技术学院,黑龙江 哈尔滨 150001)
Exploiting Multi-Level Locality to Implement the Scalable Search in Unstructured P2P Network
LI Zhi-Jun,JIANG Shou-Xu,LI Xiao-Yi
(School of Computer Science and Technology, Harbin Institute of Technology, Harbin 150001, China)
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Received:September 19, 2009    Revised:April 27, 2010
> 中文摘要: 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ML
Abstract:Some statistical characteristic will emerge in unstructured P2P networks because of its large scale. Using above phenomena, an unstructured P2P overlay called Multi-Level Local Overlay, or ML2O is presented in this paper. The mathematical control on the links can generate a topology with locality in multiple scale. Theoretical analyses show that the diameter of network and the average degree of peers are all O(logn) where n is the size of peers. Based on the multi-level locality, a recursive indexing mechanism is devised in this paper, in which the index for larger locality is build from the indexes of smaller localities Finally, an unstructured P2P search algorithm called Local Pervasion and Directed Search, or LPDS is presented in this paper. LPDS will collect information from local scope by executing local pervasion. Moreover, a part of the index tree can be achieved from the collected information. LPDS can find the next hop approaching the destination in the partial index tree. Theoretical analyses show that the expectation of average search hops and communication loads produced by LPDS are all O(logn). Experimental results illustrate the scalability of LPDS on ML2O is close to structured P2P search and its robustness is close to unstructured P2P search.
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基金项目:国家自然科学基金(60803148, 60973124) 国家自然科学基金(60803148, 60973124)
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李治军,姜守旭,李晓义.利用多级局部性实现可扩展的无结构P2P 搜索.软件学报,2011,22(9):2104-2120

LI Zhi-Jun,JIANG Shou-Xu,LI Xiao-Yi.Exploiting Multi-Level Locality to Implement the Scalable Search in Unstructured P2P Network.Journal of Software,2011,22(9):2104-2120