Appears in Proceedings of the
International Conference on Pervasive Computing (Pervasive 2002)
We present SCAN, the Scalable Content Access Network.
SCAN combines dynamic replica placement with a self-organizing application-level
multicast tree to meet client QoS and server resource constraints.
It utilizes an underlying distributed object routing and location system
(DOLR) as an essential component. Simulation results on both flash-crowd-like
synthetic workloads and real Web server traces show that SCAN deploys close
to an optimal number of replicas, achieves good load balance, and incurs
a small delay and bandwidth penalty for update multicast relative to static
replica placement on IP multicast. We envision that SCAN could enhance
a number of different applications, such as content distribution and peer-to-peer