Bidirectional clone node model of optimizing performance of structured P2P overlay network

In order to reduce the maintenance cost of structured Peer-to-Peer (P2P), Clone Node Protocol (CNP) based on user behavior is proposed. CNP considers the regularity of user behavior and uses the method of clone node. A Bidirectional Clone Node Chord model (BCNChord) based on CNP protocol is designed and realized. In BCNChord, Anticlockwise Searching Algorithm, Difference Push Synchronize Algorithm and Optimal Maintenance Algorithm are put forward to increase the performances. In experiments, according to the fre-quency of nodes, the maintenance cost of BCNChord can be 3.5%~32.5% lower than that of Chord. In the network of 2 ¹² nodes, the logic path hop is steady at 6, which is much more prior to 12 of Chord and 10 of CNChord. Theoretical analysis and experimental results show that BCNChord can effectively reduce the maintenance cost of its structure and simultaneously improve the query efficiency up to (1/4)O(logN). BCNChord is more suitable for highly dynamic environment and higher real-time system.