Service-Centric Networking with SCAFFOLD
PRINCETON UNIV NJ DEPT OF COMPUTER SCIENCE
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Online services are typically replicated on multiple servers in different datacenters, and have at best a loose association with specific end-hosts or locations. To meet the needs of these online services, we introduce SCAFFOLD--an architecture that provides flow-based anycast with possibly moving service instances. SCAFFOLD allows addresses to change as end-points move, in order to retain the scalability advantages of hierarchical addressing. Successive refinement in resolving service names limits the scope of churn to ensure scalability while in-band signaling of new addresses supports seamless communication as end-points move. We design, build, and evaluate a SCAFFOLD prototype that includes an end-host network stack built as extensions to Linux and the BSD socket API and a network infrastructure built on top of OpenFlow and NOX. We demonstrate several applications, including a cluster of web servers, partitioned memcached servers, and migrating virtual machines, running on SCAFFOLD.
- Computer Systems Management and Standards