Towards scalable and affordable content distribution services

Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521), 2004

interactions whose quality is mainly affected by application response time. Content Delivey Networks (CDNs) have shortly appeared as a distributed solution to serve content faster than contacting a centralized server. Their effectiveness has been showed by larger com panies such as Akamai and Speedera. However, there is currently a certain gap about implementations issues of this technology, and only arquitectural designs and performance reports are published. This article tries to describe a CDN from a different point of view, paying much attention on the implementation process of a CDN.

Lecture Notes in Computer Science, 2004

Content Delivery Networks (CDN) aim at overcoming the inherent limitations of the Internet. The main concept at the basis of this technology is the delivery at edge points of the network, in proximity to the request areas, to improve the user's perceived performance while limiting the costs. This paper focuses on the main research areas in the field of CDN, pointing out the motivations, and analyzing the existing strategies for replica placement and management, server measurement, best fit replica selection and request redirection.

2012

As more aspects of our work and life move online and the Internet expands beyond a communication medium to become a platform for business and society, Content Delivery Networks (CDNs) have recently gained momentum in the Internet computing landscape. Today, a large portion of Internet traffic is originating from CDNs. The ultimate success of CDNs requires novel policies that would address the increasing demand for content.

IEEE International Conference on Networks, 2003

The current paradigm of content distribution networks (CDN) deployment requires heavy infrastructure investment since a large number of servers have to be deployed over a wide area. To overcome this difficulty, we propose a new paradigm where future CDNs are to be deployed over a leased server infrastructure. This paradigm shift changes the object placement problem in current CDNs to

Computer Communications, 2006

Due to the technical developments in electronics the amount of digital content is continuously increasing. In order to make digital content respectively multimedia content available to potentially large and geographically distributed consumer populations, Content Distribution Networks (CDNs) are used. The main task of current CDNs is the efficient delivery and increased availability of content to the consumer. This area has been subject to research for several years. Modern CDN solutions aim to additionally automate the CDN management. Furthermore, modern applications do not just perform retrieval or access operations on content, but also create content, modify content, actively place content at appropriate locations of the infrastructure, etc. If these operations are also supported by the distribution infrastructure, we call the infrastructure Content Networks (CN) instead of CDN. In order to solve the major challenges of future CNs, researchers from different communities have to collaborate, based on a common terminology. It is the aim of this paper, to contribute to such a terminology, to summarize the state-of-the-art, and to highlight and discuss some grand challenges for CNs that we have identified. Our conception of these challenges is supported by the answers to a questionnaire we received from many leading European research groups in the field. q

2006

Information Technology and Management, 2011

One strategy for alleviating excess latency (delay) in the Internet is the caching of web content at multiple locations. This reduces the number of hops necessary to reach the desired content. This strategy is used for web content such as html pages, images, streaming video, and Internet radio. The network of servers which store this content, and the collections of objects stored on each server, is called a content distribution network (CDN). In order to optimally design a CDN, given a network topology with available server storage capacity at various points in the network, one must decide which object collections to place on each server in order to achieve performance or cost objectives. The placements must be within the storage limits of the servers and must reflect the request patterns for each collection of objects to be cached. Researchers have suggested formulations for the CDN problem which address performance by minimizing latency (the average number of hops is a commonly accepted measure of latency) from client to content, or formulations that focus on minimizing cost of storage and/or bandwidth. In this research, we develop a model which allows for the simultaneous treatment of performance and cost, present examples to illustrate the application of the model and perform a detailed designed experiment to gain insights into cost/hops tradeoff for a variety of network parameters.

2006

Abstract. Web caching and replication tune capacity with performance and they have become essential components of the Web. In practice, caching and replication techniques have been applied in proxy servers and Content Distribution Networks (CDNs) respectively. In this paper, we investigate the benefits of integrating caching policies on a CDN's infrastructure.

Seventh IEEE International Symposium on Cluster Computing and the Grid (CCGrid '07), 2007

Existing Content Delivery Networks (CDNs) exhibit the nature of closed delivery networks which do not cooperate with other CDNs and in practice, islands of CDNs are formed. The logical separation between contents and services in this context results in two content networking domains. In addition to that, meeting the Quality of Service requirements of users according to negotiated Service Level Agreement is crucial for a CDN. Present trends in content networks and content networking capabilities give rise to the interest in interconnecting content networks. Hence, in this paper, we present an open, scalable, and Service-Oriented Architecture (SOA)-based system that assist the creation of open Content and Service Delivery Networks (CSDNs), which scale and supports sharing of resources through peering with other CSDNs. To encourage resource sharing and peering arrangements between different CDN providers at global level, we propose using market-based models by introducing an economy-based strategy for content replication. Streaming media Desktop CDN Music (MP3) / Audio Cell Phone Contents and services End-users Smart phone / PDA Laptop Web pages E-docs Figure 1: Content/services provided by a CDN Page 2 of 13

2007