The emerging Peer-to-Peer (P2P) model has becomea very powerful and attractive paradigm for developing Internetscale systems for sharing resources, including ﬁles and documents. The distributed nature of these systems, where nodesare typically located across different networks and domains,inherently hinders the efﬁcient retrieval of information. In thispaper we consider the effects of topologically-aware overlayconstruction techniques on efﬁcient peer-to-peer keyword searchalgorithms. We present the pFusion (Peer Fusion) architecturethat aims to efﬁciently integrate heterogeneous information thatis geographically scattered on peers of different networks. Ourapproach builds on work in unstructured peer-to-peer systems,and uses only local knowledge. Our empirical results, using thepFusion middleware architecture and datasets from AKAMAI,NLANR and TREC, show that the architecture we propose isboth efﬁcient and practical
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