Statistical modelling of information sharing: Community, membership, and content
Performance Evaluation - Performance 2005
A reliable decentralized peer-to-peer video-on-demand system using helpers
PCS'09 Proceedings of the 27th conference on Picture Coding Symposium
Clusters-Based distributed streaming services with fault-tolerant schemes
PCM'04 Proceedings of the 5th Pacific Rim conference on Advances in Multimedia Information Processing - Volume Part III
| Hi-index | 0.01 |
Video-on-demand (VoD) systems have traditionallybeen built on the client-server architecture, where a videoserver stores, retrieves, and transmits video data to videoclients for playback. This paper investigates a radicallydifferent approach to building VoD systems, one where theserver, and hence the primary bottleneck, is completelyeliminated. This server-less architecture compriseshomogeneous hosts, called nodes, which serve both asclient and as mini-server. Video data are distributed overall nodes and these nodes cooperatively stream video datato one another for playback. However, unlike traditionalvideo server that runs on high-end server hardware in acarefully controlled and protected data centre, a node in aserver-less system is likely to be far more unreliable.Therefore it is essential that sufficient data and capacityredundancies are incorporated to maintain an acceptableservice reliability. This paper presents and analyzes a faulttolerant mechanism based on inter-node striping anderasure correction codes to tackle this challenge. Byformulating the system's reliability as a Markov chainmodel, we obtain insights into the feasible operating regionof the system, such as the amount of redundancy requiredand the node-level reliability that can be tolerated.Numerical results show that a server-less VoD system of200 nodes can achieve reliability surpassing that ofdedicated video server using a redundancy overhead ofonly 21.2% even though individual nodes are highlyunreliable.