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arXiv 0903.3759cs.NIcs.DBcs.DC
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GeoP2P:一种用于空间信息高效搜索和更新的自适应对等覆盖

GeoP2P: An adaptive peer-to-peer overlay for efficient search and update of spatial information

Shah Asaduzzaman, Gregor v. Bochmann

摘要:

本文提出了一种完全分散的对等覆盖结构GeoP2P,以促进基于地理位置的信息搜索和检索。集中式地理索引的某些限制有利于信息的对等组织,除了避免性能瓶颈之外,还允许对本地信息的自治。建立在现有DHT上的用于地理或多维范围查询的对等系统遭受多维空间线性化的不准确性。基于搜索空间的分层划分的其他覆盖结构是不可缩放的,因为它们使用特殊的超级对等点来表示分层结构中的节点。GeoP2P对搜索空间进行层次化划分,维护覆盖结构,无需超级节点即可完成路由。虽然以前已经提出了类似的完全分散的覆盖,但它们缺乏在对等点数量变化时动态增长和收缩分区层次结构的能力。GeoP2P提供了这样的自适应功能与系统状态的最小扰动。这样的适应使得路由延迟和每个对等点的状态大小与对等点的总数成对数,而不管多维空间的大小。我们的分析还表明,覆盖结构和路由算法是通用的和独立的分区层次结构的几个方面,如几何形状的区域或搜索空间的维数。

英文摘要:

This paper proposes a fully decentralized peer-to-peer overlay structure GeoP2P, to facilitate geographic location based search and retrieval of information. Certain limitations of centralized geographic indexes favor peer-to-peer organization of the information, which, in addition to avoiding performance bottleneck, allows autonomy over local information. Peer-to-peer systems for geographic or multidimensional range queries built on existing DHTs suffer from the inaccuracy in linearization of the multidimensional space. Other overlay structures that are based on hierarchical partitioning of the search space are not scalable because they use special super-peers to represent the nodes in the hierarchy. GeoP2P partitions the search space hierarchically, maintains the overlay structure and performs the routing without the need of any super-peers. Although similar fully-decentralized overlays have been previously proposed, they lack the ability to dynamically grow and retract the partition hierarchy when the number of peers change. GeoP2P provides such adaptive features with minimum perturbation of the system state. Such adaptation makes both the routing delay and the state size of each peer logarithmic to the total number of peers, irrespective of the size of the multidimensional space. Our analysis also reveals that the overlay structure and the routing algorithm are generic and independent of several aspects of the partitioning hierarchy, such as the geometric shape of the zones or the dimensionality of the search space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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