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P2P systems must handle unexpected peer failure and leaving, and thus it is more difficult to implement than server-client systems. In this paper, the authors propose a novel approach to implement P2P systems by using virtual peers. A virtual peer consists of multiple unstable peers. A virtual peer is a stable entity; application programs run on a virtual peer are not compromised unless a majority of the peers fail within a short time duration. If a peer in a virtual peer fails, the failed peer is replaced by another (non-failed) one to restore the number of working peers. The primary contribution of this paper is to propose a method to form a stable virtual peer over multiple unstable peers.
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