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• W3099054672 abstract "Scalability of the control plane in a software-defined network (SDN) is enabled by means of decentralization of the decision-making logic, i.e., by replication of controller functions to physically or virtually dislocated controller replicas. Replication of a centralized controller state also enables the protection against controller failures by means of primary and backup replicas responsible for managing the underlying SDN data plane devices. In this paper, we investigate the effect of the deployed consistency model on scalability and correctness metrics of the SDN control plane. In particular, we compare the strong and eventual consistency, and make a case for a novel adaptive consistency approach. The existing controller platforms rely on either strong or eventual consistency mechanisms in their state distribution. We show how an adaptive consistency model offers the scalability benefits in terms of the total request-handling throughput and response time, in contrast to the strong consistency model. We also outline how the adaptive consistency approach can provide for correctness semantics that are unachievable with the eventual consistency paradigm in practice. The adaptability of our approach provides a balanced and tunable tradeoff of scalability and correctness for the SDN application implemented on top of the adaptive framework. To validate our assumptions, we evaluate and compare the different approaches in an emulated testbed with an example of a load balancer controller application. The experimental setup comprises up to five extended OpenDaylight controller instances and two network topologies from the area of service provider and data center networks." @default.
• W3099054672 created "2020-11-23" @default.
• W3099054672 creator A5021781616 @default.
• W3099054672 creator A5026737752 @default.
• W3099054672 date "2018-12-01" @default.
• W3099054672 modified "2023-09-30" @default.
• W3099054672 title "Impact of Adaptive Consistency on Distributed SDN Applications: An Empirical Study" @default.
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• W3099054672 doi "https://doi.org/10.1109/jsac.2018.2871309" @default.
• W3099054672 hasPublicationYear "2018" @default.
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