Abstract: Peer-to-peer system does not consider combining the overlay with physical network, which would cause a serious topology mismatching between the P2P logical overlay network and the physical network, and that increases the delay between the nodes. About this problem, this paper proposes the super-node selection mechanism based on district partition. This mechanism divides P2P into several regions according to physical position to ensure that nodes are close. Simulation results show that it can decrease network search delay lower, it is effective and scalable.

Key words: overlay network, physical network, super node, region partition, search delay, topology