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Providing Quality of Service (QoS) in Video on Demand systems (VoD) is a challenging problem. In this paper, the authors analyze the fault tolerance on a P2P multicast delivery scheme, called Patch Collaboration Manager/Multicast Channel Distributed Branching (PCM/MCDB). This scheme decentralizes the delivery process between clients and scales the VoD server performance. PCM/MCDB synchronizes a group of clients in order to create local network channels to replace on-going multicast channels from the VoD server. Using the P2P paradigm supposes facing the challenge of how often peers connect and disconnect from the system. To address this problem, a centralized mechanism is able to replace the failed client.
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