RELookup: Providing Resilient and Efficient Lookup Service for P2P-VoD Streaming

For P2P-VoD streaming, an effective lookup algorithm for appropriate data suppliers is required to support the user\´s operation of random jump on the video. Existing lookup algorithms mainly adopt a centralized, flooding based, or DHT-based method. Facing the highly dynamic Internet environments, the centralized method incurs a single point of failure, the flooding-based method lacks scalability, and the DHT-based method is not resilient. Motivated by these problems, we propose a novel lookup algorithm, named "RELookup", which places peers on a resilient super node-based overlay and meanwhile utilizes the play point distance to efficiently locate candidate data suppliers. Besides, deliberate measures (i.e., special design of message format and node state) have been taken to reduce the coordination costs between super nodes to very little. Results of trace-driven simulations confirm the effectiveness of our proposed RELookup algorithm.