This paper presents a new scalable distributed architecture of collaborating caches. Our approach masks faults in content distribution scenarios towards clients. Basically, in case of a failure, our architecture requests content from distributed caches. When the content is found it is transparently transported to the requesting receiver. Distributed architectures of collaborating caches for fault tolerant content delivery pose a fundamental challenge: The probability to find requested content stored in caches, rises with the number of caches involved. A rising number of caches however implicates more signaling overhead for each query leading to scalability problems. In this work we present a new reliable distributed content discovery architecture that solves the scalability problem. Building on a 2 tier Peer-to-Peer overlay networks in combination with local summary distribution based on Multicast signaling, we provide a fast and scalable singaling architecture for content discovery in large distributed cache networks.
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