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In cloud systems, big data must be partitioned and then stored over several data nodes (DNs) for being processed by virtual machines(VMs). Thus, there exists access latency among DNs and their assigned VMs. Meanwhile, the access latency also exists among the pairs of assigned VMs for the computing result collection. Different VM assignment strategies for DNs result in different access latency. It...
Data replication enhances data availability and thereby improves the system reliability and efficiency while reduces access latency and communication cost. A critical issue in data replication is to wisely place data replicas which involves identifying the best possible nodes to duplicate data according to user requests. In this paper, we address the problem of replica placement and update in tree...
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