Supervision : Marc SHAPIRO

Colony: A Hybrid Consistency System for Highly-Available Collaborative Edge Computing

Immediate response, autonomy and availability are brought to edge applications, such as gaming, cooperative engineering, or in-the-field information sharing, by distributing and replicating data at the edge. However, application developers and users demand the highest possible consistency guarantees, and specific support for group collaboration. To address this challenge, COLONY guarantees Transactional Causal Plus Consistency (TCC+) globally, dovetailing with Snapshot Isolation within edge groups. To help with scalability, fault tolerance and security, its logical communication topology is tree-like, with replicated roots in the core cloud, but with the flexibility to migrate a node or a group. Despite this hybrid approach, applications enjoy the same semantics everywhere in the topology. Our experiments show that local caching and peer groups improve throughput and response time significantly, performance is not affected in offline mode, and that migration is seamless.

2017-2021 Publications

• 2021
  • I. Toumlilt : “Colony: A Hybrid Consistency System for Highly-Available Collaborative Edge Computing”, thesis, phd defence 12/21/2021, supervision Shapiro, Marc (2021)
  • I. Toumlilt, P. Sutra, M. Shapiro : “Highly-available and consistent group collaboration at the edge with colony”, Middleware '21: Proceedings of the 22^nd International Middleware Conference, Québec / Virtual, Canada, pp. 336–351, (ACM) (2021)
• 2017
  • I. Toumlilt, A. Tomsic, M. Shapiro : “Vers une cohérence causale évolutive sans chaînes de ralentissements”, Compas 2017: Conférence d’informatique en Parallélisme, Architecture et Système, Nice Sophia-Antipolis, France (2017)