Series in Distributed
Computing
edited
by Roger Wattenhofer
Vol.
15
Remo Meier
Toward Structured and Time-Constraint
Content
Delivery Systems
1st edition/1. Aufl. 2011, VIII, 130 pages/Seiten, € 64,00.
ISBN 3-86628-406-3 and 978-3-86628-406-7
Over recent years,
we have witnessed an unprecedented interest in Internetbased services such as
the delivery of audio and video content. This strong growth challenges the
underlying network infrastructure. Predominant server-based content delivery
mechanisms fail to scale with the growing demand in terms of cost and e_ciency.
Peer-to-peer technology is an appealing alternate paradigm for content
delivery. Users, or peers, with similar interests dynamically gather to
exchange content and thereby reduce the load on the servers. By utilizing the
resources of participating users, peer-to-peer systems gain in power with a
growing number of users. Peers may favor content exchange with near-by users,
lessening the load on the underlying network infrastructure.
This thesis
studies the delivery of time-sensitive content among large numbers of users
with a focus on live streaming of audio and video content. In this context,
peer-to-peer protocols face challenges not encountered in other applications
such as _le sharing. In particular, the streaming content must be received with
respect to hard real-time constraints; data has to be delivered in time to meet
stringent playback deadlines. Peers may join and leave the system continuously
and concurrently. Intermediate peers must authenticate incoming data blocks
before forwarding them to other peers, preventing a ruinous snowball e_ect of
proliferating fraudulent packets. This thesis proposes a novel, structured yet
exible approach to peerto-peer content delivery. It includes lessons from
distributed hash tables to design a suitable overlay structure. A unique
push-to-pull-based content dissemination mechanism complements the overlay
structure, while strong topology awareness limits the stress on the underlying
network infrastructure.
This thesis
additionally introduces techniques to provide security and fairness to all
participating peers. A fully developed implementation of the protocols showcases
the practicability and bene_ts of the proposed techniques for real world use.
About the author:
Remo Meier received his
M.Sc. degree in computer science from the ETH Zurich, the Swiss Federal
Institute of Technology in Zurich, Switzerland in 2006. In the same
year, he joined the Distributed Computing Group of Professor Roger Wattenhofer at
the ETH Zurich as a Ph.D. student. In 2011 he received his Ph.D. degree for his
work on peer-to-peer content delivery systems.
Keywords: Peer-to-Peer,
Streaming, Content Delivery, Overlay Networks, Security
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