DATE: Thursday , October 31, 2002
TIME: Noon - 1 pm
PLACE: Wean Hall 8220

Joseph M. Hellerstein
Associate Professor
Computer Science Division
University of California, Berkeley

Telegraph, TinyDB and PIER: Three Takes on Adaptive Dataflow

A key contribution of the database community is the notion of data independence: the decoupling of applications from physical properties of the computing environment. Data independence is achieved via query processing techniques. Simply viewed, query processors configure and execute dataflow programs to span the level of indirection between high-level logical requests and volatile physical data layouts and delivery mechanisms. Such levels of indirection are becoming more pervasive in emerging networked architectures, including overlays on the Internet and ad hoc wireless networks of sensors and actuators. If these new networked systems are to be robust, malleable and easily deployed, they will require intelligent indirection architectures, and new more adaptive dataflow technologies to span the indirections.

In this talk, I will present three examples of work we're doing at Berkeley on adaptive dataflow over networked environments. I will begin by describing the building blocks of the Telegraph system in some detail. Telegraph is a centralized query processor for networked data sources and streams. I will also provide quick overviews of two more recent projects: TinyDB, a query processing system for wireless sensors, and PIER, a peer-to-peer overlay system for querying the Internet. In presenting these systems, I will try to highlight some resonances between the networking and database communities.

Joseph M. Hellerstein is an Associate Professor of Computer Science at the University of California, Berkeley. He is an Alfred P. Sloan Research Fellow, and a recipient of the NSF CAREER, NASA New Investigator, and Okawa Foundation Fellowship awards. In 1999, MIT's Technology Review named him one of the top 100 young technology innovators (TR100).

Hellerstein's research focuses on data management and movement, including database systems, sensor networks, peer-to-peer and federated systems.

Hellerstein received his Ph.D. at the University of Wisconsin, Madison, a masters degree from UC Berkeley, and a bachelor's degree from Harvard College. He spent a pre-doctoral internship at IBM Almaden Research Center, and a post-doctoral internship at the Hebrew University in Jerusalem.

Hellerstein serves on the technical advisory boards of a number of software companies, and has served as a member of the advisory boards of ACM SIGMOD and Ars Digita University. He was a co-founder of Cohera Corporation (now part of PeopleSoft), where he served as Chief Scientist from 1998-2001. He currently serves as a Faculty Research Associate of the Intel Berkeley Research Lab.

For Further Seminar Info: