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D-Flooding:非结构化P2P网络中高效搜索策略


□ 董西广 庄 雷 常玉存

  摘 要:为了能够在保持高覆盖范围的前提下大大减少冗余消息的数量,提出了一种新的基于连接度的搜索机制D-Flooding。D-Flooding在搜索的不同阶段,依据连接度大小来选择消息的转发对象。分析和实验结果表明,D-Flooding能够提供较低负载的查询,高效地应用于P2P搜索。与标准洪泛机制相比,在跳数不变的情况下,冗余消息的数量可减少84.5%以上,而消息的覆盖范围基本不变。
  关键词:对等网络;洪泛;连接度
  中图分类号:TP393 文献标志码:A 文章编号:1001-3695(2008)08-2499-03
  
  D-Flooding: efficient search algorithm in unstructured P2P networks
  DONG Xi-guang,ZHUANG Lei,CHANG Yu-cun
  (School of Information Engineering, Zhengzhou University, Zhengzhou450052,China)
  Abstract:This paper proposed D-Flooding, an efficient degree-based flooding scheme, with the objective of minimizing the number of redundant messages and retaining the same message propagating scope as that of standard flooding. At the different searching steps, D-Flooding chose nodes to forward massages according to their degrees. Analysis and simulation results show that the D-Flooding scheme provides a low overhead broadcasting facility that can be effectively used in P2P searching. Compared with standard flooding used in Gnutella, it shows that the D-Flooding scheme with the same TTL can reduce up to more than 84.5% of flooding messages, and retain almost the same flooding scope.
  Key words:peer-to-peer network; flooding; degree ......
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