Improving Peer-to-Peer Systems by Differentiated Resource Publishing Architecture

In current peer-to-peer (P2P) systems, system performance is evaluated by the metrics that characterize the features of the whole system while how each node in system affects the system performance is rarely considered. In this paper, we first introduce a new metric of publishing efficiency based on the impact of nodes´ characters on the system performance. Then, we build an analytical model to study the relationship between nodes´ characters and the ranges that resources of the nodes can serve queries when all nodes keep the same publishing efficiency. Based on the analytical results, we propose a new differentiated resource publishing (DRP) architecture to keep nodes´ publishing efficiency high. To the best of our knowledge, DRP architecture is the first to improve P2P systems from the impact of nodes´ characters on the system performance. Simulation shows that this architecture can keep nodes´ publishing efficiency in a high level and also greatly reduce search cost with only modest system maintenance cost.