Hierarchical substring caching for efficient content distribution to low-bandwidth clients
WWW '05 Proceedings of the 14th international conference on World Wide Web
Evaluation of ESI and class-based delta encoding
Web content caching and distribution
CFP taxonomy of the approaches for dynamic web content acceleration
ADBIS'05 Proceedings of the 9th East European conference on Advances in Databases and Information Systems
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Caching static HTTP traffic in proxy-caches has reduced bandwidth consumption and download latency. However, web-caching performance is hard to increase further due to the growing number of non-cachable dynamic web-documents. Delta-encoding is a promising technique that exploits temporal correlation among different snapshots of a dynamic document, and renders dynamic traffic cachable. It achieves this by combining a cachable, previous snapshot of a document, called base-file, with small difference-file, called delta, to generate the current snapshot of the document. However, it has not yet been deployed due to the significant scalability concerns related to the storage requirements for base-files on theserver-side.In this paper we introduce class-based delta-encoding, a scalable scheme to perform delta-encoding on dynamic web-traffic. The idea is to group documents into classes, and store one document per class on the server-side. Thus, the proposed scheme exploits both temporal correlation in a dynamically evolving document, and spatial correlation among different documents. Finally, we present an architecture to deploy the scheme, that is transparent to clients, proxy-caches, and web-servers. Experimental results report thatclass-based delta-encoding combined with compression reduces the bandwidth consumption by a factor of 30, and the latency perceived by most users by a factor of 10 on average, without suffering from enormous storage requirements on the server-side.