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Department of Computer Science Colloquium
2005 Series

Validation-Based Approximate Data Replication

Dr. Xueyan TANG
Nanyang Technological University

Date: November 4, 2005 (Friday)
Time: 2:00 - 3:00 pm
Venue: SCT909, Cha Chi Ming Science Tower, Ho Sin Hang Campus

The validation-based scheme is widely used to keep replicated data up-to-date in the Internet. This approach ensures that the data retrieved from the replicas are never outdated by over a designated time period with respect to the authoritative origin data. It is therefore known as approximate data replication. In this talk, we discuss two issues under validation-based approximate data replication. We consider two classes of service models: replica-aware services and replica-blind services. In replica-aware services, the servers are aware of the locations of replicas and can therefore optimize request routing to improve performance. We study the routing optimization among replicas to cut down validation cost. In replica-blind services, the servers are not aware of the locations of replicas or even their existence. Thus, each replica only serves the requests flowing through it under a given routing strategy. We investigate the placement of replicas to reduce access and validation costs.

Xueyan Tang received his BEng degree in computer science and engineering from Shanghai Jiao Tong University, Shanghai, China, in 1998, and his PhD degree in computer science from the Hong Kong University of Science and Technology in 2003. He is currently an Assistant Professor in the School of Computer Engineering at Nanyang Technological University, Singapore. He is an editor of a book entitled Web Content Delivery published by Springer. His research interests include mobile and pervasive computing, wireless sensor networks, Web and Internet. and distributed system, particularly the data management aspects in these areas.

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