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A Quorum-Based Protocol for Searching Objects in Peer-to-Peer Networks
January 2006 (vol. 17 no. 1)
pp. 25-37
Hirotsugu Kakugawa, IEEE Computer Society

Abstract—Peer-to-peer (P2P) system is an overlay network of peer computers without centralized servers, and many applications have been developed for such networks such as file sharing systems. Because a set of peers dynamically changes, design and verification of efficient protocols is a challenging task. In this paper, we consider an object searching problem under a resource model such that there are some replicas in a system and the lower bound of the ratio \rho=n^\prime /n is known in advance, where n^\prime is a lower bound of the number of peers that hold original or replica for any object type and n is the total number of peers. In addition, we consider object searching with probabilistic success, i.e., for each object search, object must be found with at least probability 0 < \sigma < 1. To solve such a problem efficiently, we propose a new communication structure, named probabilistic weak quorum systems (PWQS), which is an extension of coterie. Then, we propose a fault-tolerant protocol for searching for objects in a P2P system. In our method, each peer does not maintain global information such as the set of all peers and a logical topology with global consistency. In our protocol, each peer communicates only a small part of a peer set and, thus, our protocol is adaptive for huge scale P2P network.

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Index Terms:
Distributed systems, distributed data structures, reliability and robustness, combinatorial algorithms, distributed file systems.
Citation:
Ken Miura, Taro Tagawa, Hirotsugu Kakugawa, "A Quorum-Based Protocol for Searching Objects in Peer-to-Peer Networks," IEEE Transactions on Parallel and Distributed Systems, vol. 17, no. 1, pp. 25-37, Jan. 2006, doi:10.1109/TPDS.2006.2
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