Event Based Systems in Iași

Measuring the Impact of Indirect WAN Routing for Geo-Replicated Storage on European Micro-Clouds
Prof. Etienne Rivière (Université Catholique de Louvain)

• Wednesday, 9 May 2018, 12:00, C210 (Faculty of Computer Science, C Building, UAIC)

Micro-clouds infrastructures allow supporting applications on local and energy-efficient resources. Communication between micro-clouds takes place however on shared and non-dedicated Internet links: this means network control and optimization can only happen at the edge. At the same time, for availability and persistence, the storage of application data running on micro-clouds must be geo-replicated. Maintaining strong data consistency under concurrent accesses requires delay-sensitive coherence protocols, linking the performance of the storage to that of the network between micro-clouds. I will present an evaluation of the use of network control at the edge of a European-wide multi-site testbed, together with appropriate network monitoring, and show how it can allow improving the performance of ZooKeeper, a strongly-consistent replicated store. Our approach leverages the indirect routing of coherence protocol traffic in the presence of network triangle equality violations. We analyze the impact on storage of variations in WAN performance, and show how the use of traffic redirection can help reducing it.

Work done in collaboration with TU Cluj-Napoca, Romania.

Etienne Rivière is professor of computer science at Université catholique de Louvain (UCLouvain), Belgium. He received his PhD from the University of Rennes, France in November 2007. He has been an ERCIM post-doctoral fellow at UniNE and NTNU, Norway in 2008-2009. He was a lecturer at UniNE from 2011 to 2017. Etienne’s interests lie in large-scale distributed systems and Cloud Computing. He recently coordinated the LEADS EU FP7 project on Big-Data-as-a-Service over geo-distributed Cloud infrastructures, and currently coordinates the DIONASYS EU chist-era project on interoperability and adaptation for overlay-based systems.

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