Automating Server Selection With OASIS

OASIS provides a publicly available, locality-aware server-selection infrastructure. Replicated servers adopting OASIS each run a small application that communicates with the OASIS infrastructure, sharing information about their current load levels and their measured network response times to selected IP addresses. OASIS in turn can redirect unmodified clients to nearby and/or lightly loaded live replica servers. In this paper, the author explains how OASIS works, provide some performance analysis, and describe how services can start using OASIS. OASIS (Overlay Anycast Service InfraStructure) has been publicly deployed since November 2005 on PlanetLab, a distributed testbed running at over 300 academic and industry sites.