SCDN: Stable Content Distribution Network based on demands

Because of the frequent changes of participant peers and their demands in a P2P network, the topological structure of peers and contents is always in change. These changes lead to some difficulties in object lookup and object update. We present a system called stable content distribution network (SCDN) to form a stable double-layer structure based on peers’ demands. In this structure, (1) the efficiency of object lookup can be improved even under frequent arrival and departure of participant peers by using the long-distance connections provided by object update, (2) all contents and their replicas can keep consistency after object update by forming a hierarchy structure, while the stability of the network can be monitored and fixed during object update. We use both theoretical and experimental analysis and compare SCDN with other P2P networks. Results show that SCDN is efficient in object lookup and object update, and can provide consistency and robustness.

Research highlights
► SCDN form a stable double-layer structure based on peer’s demands.
► The efficiency of object lookup is improved by shortcut provided by object update.
► A hierarchy structure is formed to guarantee the fidelity of replica consistency.
► The stability of SCDN can be monitored and fixed during object update.