Delivering quality of service (QOS) guarantees in distributed systems is fundamentally an end-to-end issue, that is, from application-to-application. Consider, for example, the remote access and distribution of audio and video content from a web server: in the distributed system platform, quality of service assurances should apply to the complete flow of information from the remote server across the network to the point of delivery and playout.
Generally, this requires end-to-end admission testing and resource reservation in the first instance, followed by careful co-ordination of disk and thread scheduling and flow control in the end-systems, packet/cell scheduling and congestion control in the network and, finally, active end-to-end monitoring and maintenance of the delivered quality of service.
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