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1 GDD - Gestion de Données Distribuées Nantes LINA - Laboratoire d-Informatique de Nantes Atlantique

Abstract : Federated query engines allow data consumers to execute queries over the federation of Linked Data LD. However, as feder-ated queries are decomposed into potentially thousands of subqueries distributed among SPARQL endpoints, data providers do not know fed-erated queries, they only know subqueries they process. Consequently, unlike warehousing approaches, LD data providers have no access to secondary data. In this paper, we propose FETA FEderated query TrAcking, a query tracking algorithm that infers Basic Graph Patterns BGPs processed by a federation from a shared log maintained by data providers. Concurrent execution of thousand subqueries generated by multiple fed-erated query engines makes the query tracking process challenging and uncertain. Experiments with Anapsid show that FETA is able to extract BGPs which, even in a worst case scenario, contain BGPs of original queries.

Autor: Georges Nassopoulos - Patricia Serrano-Alvarado - Pascal Molli - Emmanuel Desmontils -



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