Gesellschaft fr Informatik e.V.

Lecture Notes in Informatics

Informatik 2004, Informatik verbindet, Band 2, Beiträge der 34. Jahrestagung der Gesellschaft für Informatik e.V. (GI), Ulm, 20.-24. September 2004 P-51, 234-238 (2004).

GI, Gesellschaft für Informatik, Bonn


Peter Dadam, Manfred Reichert (eds.)

Copyright © GI, Gesellschaft für Informatik, Bonn


Distributed job scheduling in a peer-to-peer video recording system

Curt Cramer , Kendy Kutzner and Thomas Fuhrmann


Since the advent of Gnutella, Peer-to-Peer (P2P) protocols have matured towards a fundamental design element for large-scale, self-organising distributed systems. Many research efforts have been invested to improve various aspects of P2P systems, like their performance, scalability, and so on. However, little experience has been gathered from the actual deployment of such P2P systems apart from the typical file sharing applications. To bridge this gap and to gain more experience in making the transition from theory to practice, we started building advanced P2P applications whose explicit goal is “to be deployed in the wild”. In this paper, we describe a fully decentralised P2P video recording system. Every node in the system is a networked computer (desktop PC or set-top box) capable of receiving and recording DVB-S, i.e. digital satellite TV. Like a normal video recorder, users can program their machines to record certain programmes. With our system, they will be able to schedule multiple recordings in parallel. It is the task of the system to assign the recordings to different machines in the network. Moreover, users can “record broadcasts in the past”, i.e. the system serves as a short-term archival storage for TV programmes, too. Since we want the system to be evaluated by a large number of users, we decided to build it as a plug-in for the popular and widely deployed Linux Video Disk Recorder (VDR) software ( VDR already offers the basic recording functionality, thus we can focus on the aspect of cooperatively scheduling recordings. No definite results can be discussed yet, as the work presented here is in progress. Nevertheless, we are already able to point out some important design issues and open research questions.

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GI, Gesellschaft für Informatik, Bonn
ISBN 3-88579-3080-6

Last changed 24.01.2012 21:47:15