Collaboration dans une fédération de consommateurs de données liées

Abstract : Following the Linked Data principles, data providers have published billions of RDF facts on the web. Anyone can retrieve some relevant information from the Linked Data by executing SPARQL queries. Such queries are useful in many domains including health or data journalism. However, there is a trade-off between performances of the queries and data availability when executing SPARQL queries. In this thesis, we have investigated how the collaboration of data consumers is opening new opportunities in this trade-off. More precisely, how the collaboration of data consumers can improve performances without degrading availability, or can improve availability without degrading performances. We consider that Linked Data can allow anyone to run a compact mediator that executes SPARQL queries over data sources on the web. The main idea is to connect these mediators together to build a federation of Linked Data consumers. In this federation, each mediator interacts with a subset of the network. Thanks to this federation, we have built : (i) a decentralized cache hosted by mediators. This client-side cache is able to handle a significative part of subqueries and then improve data availability without a low impact on performances. (ii) a delegation algorithm that allows mediators to delegate their queries to other mediators. We have demonstrated that delegation allows to run the workloads faster when collaborating. This clearly improves performances without degrading data availability.
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Pauline Folz. Collaboration dans une fédération de consommateurs de données liées. Web. Université de Nantes, Faculté des sciences et des techniques., 2017. Français. ⟨tel-01684140⟩

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