Efficient Query Guidance Using Content Distribution Records in Unstructured Peer-to-Peer Network

Content sharing in unstructured P2P networks, where there is no function to centrally manage content location information on the network, is executed by sending queries from a peer requesting content to its neighbors one after another. This causes a problem of large increase in network load. As a solution to this problem, a method has been proposed in which each peer keeps transmission records (TRs) of queries to efficiently direct queries. However, when a query is being guided through a TR and the link is broken due to peers leaving the system, the length of the search path increases until the system recognizes the broken link. In this paper, we propose a method to increase the number of replicas of the requested content item by considering the good location of replica deployment, thereby the search path length is constrained and the spread of replicas is speeding up in the network. This is expected to increase the discovery probability of requested content item and reduce network load. The effectiveness of the proposed method is confirmed using computer simulations.