The grid: blueprint for a new computing infrastructure
The grid: blueprint for a new computing infrastructure
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This paper proposes a software architecture able to realise a Content Distribution Network (CDN), for multimedia data, by means of a Grid computing environment. The key aspect of the proposed approach is exploiting the computational power of a Grid not only to store replicas of the same multimedia content, but also to perform on-the-fly transcoding, when the requesting client is using a player that cannot handle the original file format. The proposed software infrastructure, which exploits Globus Grid services, is able on one hand to identify the storage element, holding the replica, which is the nearest to the client (if such a replica exists); and on the other hand, when the requested file is encoded with a scheme that the player cannot support, the infrastructure selects the computing element which is "best suited" - i.e. has enough computational power - to perform on-the-fly transcoding, thus providing data to the user with the requested format. This selection is based on proper metrics that aim at minimising latencies in order to increase the quality-of-service for the user.