Hierarchical Query Routing in P2P Information Filtering Systems
نویسندگان
چکیده
In recent years, various P2P network applications, Napster, Gnutella, WinMX, Winny and many others, have been developed. But it is difficult to find out suitable information resources and to guarantee practical response time by using distributed systems with simple search functions. Furthermore, most of applications are based on overlay networks with unstable network topology and query messages consume huge bandwidth in the internet. Therefore, P2P information retrieval systems have been changing from filename-based queries to contentsoriented queries with advanced data structures. We also proposed the topic-oriented search mechanism by using heuristic peer host selection functions with several parameters. We extended JXTA-like query routing protocols in order to handle characteristics of resources and queries. Our proposed hierarchy routing mechanism has the tradeoff between the cost of query forwarding and the amount of storage for routing information. Therefore, in order to evaluate the characteristics of hierarchical peer clusters, we analyze mathematical model with Palm-probability and Poisson-Voronoi-Clustering.
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