Download Web Content Delivery (Web Information Systems Engineering by Xueyan Tang (Editor), Jianliang Xu (Editor), Samuel T. PDF

By Xueyan Tang (Editor), Jianliang Xu (Editor), Samuel T. Chanson (Editor)

The concept that of content material supply has turn into an increasing number of very important because of speedily transforming into calls for for effective distribution and quick entry of data from the net. The content material could be various and broad-ranging, and the desire to facilitate ubiquitous info entry calls for diversified community architectures and units. the necessity to convey caliber info – given the character of the content material, community connections and purchaser units – introduces quite a few demanding situations for content material supply applied sciences. web pages supply deals the main complete insurance of cutting-edge examine, supplying insightful and thought-provoking chances for the way forward for net purposes. Written through prime foreign researchers, the publication specializes in websites supply, dynamic websites, streaming media supply and ubiquitous net entry. web pages supply is an important reference for either educational researchers and commercial practitioners.

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The CDN system RaDaR [Rabinovich and Aggarwal, 1999] implemented two request redirection policies that try to tackle the aforementioned problems. , 1999] ranks the servers according to how many requests each of them has served. It then redirects clients so that the requests are evenly distributed across the nodes and the network distance between client and server is low. The underlying assumption here is that load as a function of number of requests is the same function across all nodes. While this solves the problem of hotspots, it does ignore network congestion and it cannot deal with heterogeneous server resources.

Many organizations are deploying caching servers in front of their LANs, mainly as a way to speed up users Web access. Generally, available bandwidth between end-users and their Internet Service Providers (ISPs) is increasing and is complemented by short round trip times. Thus, the latency bottleneck is shifting from being between end-users and cache to being between cache and origin servers. From the viewpoint of Web sites and Content Distribution Networks (like Akamai [Akamai, 2001]), decreasing costs of server-machines and backbone connectivity bandwidth along with increasing use of the Web for commercial purposes imply that server and network load are gradually becoming a lesser issue relative to end-user quality of service.

The customer could then chose one that he believes has the best trade-off between the performance needed and the cost. , 2001], or refuses to accept it if cannot or does not want to provide service to that customer. There have been some first steps in order to move towards this vision. Huang et al. [Huang and Abdelzaher, 2004] proposed an RPA and a system architecture that can be used in order to provide latency goals to the customers with an unknown but high probability. Both a centralized and a distributed algorithm based on the set domination problem (4) was presented.

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