DONAR: Decentralized server selection for cloud services

Patrick Wendell, Joe Wenjie Jiang, Michael Joseph Freedman, Jennifer L. Rexford

Research output: Chapter in Book/Report/Conference proceedingConference contribution

101 Scopus citations


Geo-replicated services need an effective way to direct client requests to a particular location, based on performance, load, and cost. This paper presents DONAR, a distributed system that can offload the burden of replica selection, while providing these services with a sufficiently expressive interface for specifying mapping policies. Most existing approaches for replica selection rely on either central coordination (which has reliability, security, and scalability limitations) or distributed heuristics (which lead to suboptimal request distributions, or even instability). In contrast, the distributed mapping nodes in DONAR run a simple, efficient algorithm to coordinate their replica-selection decisions for clients. The protocol solves an optimization problem that jointly considers both client performance and server load, allowing us to show that the distributed algorithm is stable and effective. Experiments with our DONAR prototype - providing replica selection for CoralCDN and the Measurement Lab - demonstrate that our algorithm performs well "in the wild." Our prototype supports DNS- and HTTP-based redirection, IP anycast, and a secure update protocol, and can handle many customer services with diverse policy objectives.

Original languageEnglish (US)
Title of host publicationSIGCOMM'10 - Proceedings of the SIGCOMM 2010 Conference
Number of pages12
StatePublished - 2010
Event7th International Conference on Autonomic Computing, SIGCOMM 2010 - New Delhi, India
Duration: Aug 30 2010Sep 3 2010

Publication series

NameSIGCOMM'10 - Proceedings of the SIGCOMM 2010 Conference


Other7th International Conference on Autonomic Computing, SIGCOMM 2010
CityNew Delhi

All Science Journal Classification (ASJC) codes

  • Computational Theory and Mathematics
  • Theoretical Computer Science


  • DNS
  • distributed optimization
  • geo-locality
  • load balancing
  • replica selection


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