Distributed Systems to Support Efficient Adaptation for Ubiquitous Web

The ubiquitous Web will require many adaptation and personalization serviceswhich will be consumed by an impressive amount of dierent devices and classes ofusers. These novel advanced services will stress the content provider platforms in anunprecedented way with respect to the content delivery seen in the last decade. Mostservices such as multimedia content manipulation (images, audio and video clips) arecomputationally expensive and no single server will be able to provide all of them,hence scalable distributed architectures will be the common basis for the delivery platform.Moreover these platforms would even address novel content management issuesthat are related to the replication and to the consistency and privacy requirements ofuser/client information. In this paper we propose two scalable distributed architecturesthat are based on a two-level topology. We investigate the pros and cons of sucharchitectures from both a security, consistency and performance points of view.