Tech Reports Home Contact
Technical Report Series
Submit Report
Browse Reports
Information for Authors
Contact Details

Technical Report HW-MACS-TR-0031

TitleRepublishers in a Publish/Subscribe Architecture for Data Streams
AuthorsAlasdair J G Gray, Werner Nutt
AbstractIn data stream applications, streams typically arise from a geographically distributed collection of producers and may be queried by consumers, which may be distributed as well. In such a setting, a query can be seen as a subscription asking to be informed of all tuples that satisfy a specific condition. We propose to support the publishing and querying of distributed data streams by a publish/subscribe architecture. To enable such a system to scale to a large number of producers and consumers requires the introduction of republishers which collect together data streams and make the merged stream available. If republishers consume from other republishers, a hierarchy of republishers results. We present a formalism that allows distributed data streams, published by independent stream producers, to be integrated as views on a mediated schema. We then use this formalism to develop query planning techniques for the republishers, and methods to adapt plans when the set of available data streams changes.


Email Technical Report's Administrator
|MACS Home| Top of the Page

Department of Computer Science, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, +44 (0) 131 4514152

Last Updated: 02 September 2003 Copyright Heriot-Watt University, Disclaimer