Dynamic, large social events with concurrent activities,
in which participants view, but also provide high-quality
content to other visitors, pose one of many challenges to multimedia
delivery. Distributing content in such a situation is difficult,
and requires strong support from the underlying network, in
order to quickly respond to changes in supply and demand. A
Flock is a flexible overlay built in a self-organized, decentralized
manner, relying on a simple interest-property concept. In this
paper, we use Flocks to build large overlays that are both
content- and Quality-of-Service (QoS) aware, and show how
they adapt their structure dynamically, depending on interests in
available QoS. We evaluate their performance under churn and
large scale failures through extensive simulations, and practical
experiments under Internet conditions on the PlanetLab, and
present a selection of our results.
