Research

HORAE

The Brown Dwarf is a distributed system designed to efficiently store, query and update multidimensional data over a Peer-to-Peer overlay. It manages to distribute a highly effective centralized structure among peers on-the-fly. Both point and aggregate queries are then naturally answered on-line through cooperating nodes that hold parts of a fully or partially materialized data cube. Updates are also performed on-line, eliminating the usually costly over-night process.

Concept hierarchies greatly help in the organization and reuse of information. Multidimensional, hierarchy-organized data are widely used in a variety of applications, such as data warehousing, mining network data, etc. In the HiPPIS (Hierarchical Peer-to-Peer Indexing System) project, we investigate methods for efficiently storing and querying multidimensional data organized into concept hierarchies and dispersed over a network.

GridTorrent is an implementation of the popular BitTorrent protocol designed to interface and integrate with well-defined and deployed Data Grid components and protocols (e.g. GridFTP, RLS). Just like BitTorrent, GridTorrent is based on peer-to-peer techniques, that allow clients to download files from multiple sources while uploading them to other users at the same time, rather than obtaining them from a central server.