``On Scalable and Locality Aware Web Document Sharing"

Li Xiao, Xin Chen, Xiaodong Zhang, and Yunhao Liu

Journal of Parallel and Distributed Computing. Vol. 63, Issue. 10, 
2003, pp. 945-962.

Abstract

We propose a scalable Web document sharing infrastructure model called
Browsers-Aware Proxy Server.  In this design, a proxy server connecting
to a group of networked clients maintains an index file of data objects
of all clients' browser caches.  If a user request misses in its local
browser cache and the proxy cache, the browsers-aware proxy server
will search the index file attempting to find it in another client's
browser cache before sending the request to an upper level proxy or the
Web server. If such a request does hit in a remote client, this client
will directly forward the data object to the requesting client; or the
proxy server fetches the data object from this client and then forwards
it to the requesting client. The contributions of this caching model
are twofold.  First, we show that the amount of sharable data in browser
caches is significant and can be utilized for document sharing among
clients to improve Web caching performance and scalability. Second, the
browsers-aware model can effectively and further improve Web prefetching
performance. The browsers-aware model and its supported prefetching
technique build a strong locality-aware Internet environment to make Web
accesses fast with low communication costs.  Conducting trace-driven
simulations, we show the effectiveness of the browsers-aware model,
and its unique advantages to facilitate prefetching.

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