A distributed architecture of edge proxy servers for cooperative transcoding

Cardellini, Valeria; Colajanni, Michele; Lancellotti, Riccardo; Yu, Philip S.

doi:10.1109/wiapp.2003.1210288

Cited by 8 publications

(11 citation statements)

References 8 publications

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“…A preliminary performance comparison between ICP and Cache Digests is reported in [3]. With the experiments carried out in this paper we confirm the previous observations: the higher global hit rates of ICP tend to reduce the response time of the found resources.…”

Section: Comparison Of the Architecturessupporting

confidence: 87%

“…ICP performs well with a wide range of workloads, at least until the system is under heavy stress, as noted in [3]. Under low and medium load, the difference between the various transcoding algorithms is very small.…”

Section: Cooperative Transcoding Algorithmsmentioning

confidence: 83%

“…The authors have obtained some preliminary results through simulations of a cooperative hierarchical scheme in [4], and some experimental results referring to one cooperative algorithm on flat topologies, which demonstrate the reduction of the user response times achievable with respect to a system of non-cooperative servers [3]. New cooperative transcoding algorithms and architectures are considered here.…”

Section: Introductionmentioning

confidence: 99%

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Cooperative Architectures and Algorithms for Discovery and Transcoding of Multi-Version Content

Canali

Cardellini

Colajanni

et al.

Web Content Caching and Distribution

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A clear trend of the Web is that a variety of new consumer devices with diverse computing powers, display capabilities, and wired/wireless network connections is gaining access to the Internet. Tailoring Web content to match the device characteristics requires functionalities for content transformation, namely transcoding, that are typically carried out by the content Web server or by an edge proxy server. In this paper, we explore how to improve the user response time by considering systems of cooperative edge servers which collaborate in discovering, transcoding, and delivering multiple versions of Web objects. The transcoding functionality opens an entirely new space of investigation in the research area of distributed cache cooperation, because it transforms the proxy servers from content repositories along the client-server path into pro-active network elements providing computation and adaptive delivery. We propose and investigate different algorithms for cooperative discovery, delivery, and transcoding in the context of edge servers organized in hierarchical and flat peer-to-peer topologies. We compare the performance of the proposed schemes through ColTrES (Collaborative Transcoder Edge Services), a flexible prototype testbed that implements all considered mechanisms.

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Section: Comparison Of the Architecturessupporting

confidence: 87%

Section: Cooperative Transcoding Algorithmsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cooperative Architectures and Algorithms for Discovery and Transcoding of Multi-Version Content

Canali

Cardellini

Colajanni

et al.

Web Content Caching and Distribution

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show abstract

“…Different architectures have been evaluated ranging from flat and hierarchical schemes [5]. However, most of these studies only focus on transcoding services, which do not introduce significant security and consistency problems.…”

Section: Related Workmentioning

confidence: 99%

Distributed Systems to Support Efficient Adaptation for Ubiquitous Web

Canali

Casolari

Lancellotti

2005

High Performance Computing and Communications

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The ubiquitous Web will require many adaptation and personalization services which will be consumed by an impressive amount of different devices and classes of users. These novel advanced services will stress the content provider platforms in an unprecedented way with respect to the content delivery seen in the last decade. Most services such as multimedia content manipulation (images, audio and video clips) are computationally expensive and no single server will be able to provide all of them, hence scalable distributed architectures will be the common basis for the delivery platform. Moreover these platforms would even address novel content management issues that are related to the replication and to the consistency and privacy requirements of user/client information. In this paper we propose two scalable distributed architectures that are based on a two-level topology. We investigate the pros and cons of such architectures from both a security, consistency and performance points of view.

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“…Most of them have been carried out through simulations and aim to demonstrate the improvement of the proposed solutions. After many experiences of experiments of distributed systems in the Internet (e.g., [1,2]), we are appreciating the benefits of having a controlled testbed environment where the experiments are scientifically reproducible. For example, the performance evaluation of an origin server-side system for content adaptation provided by Chandra et al [3] in an uncontrollable real environment does not allow the authors to give a clear picture of the impact of WAN effects.…”

Section: Introductionmentioning

confidence: 99%