@inproceedings{96c2b0ab3caa45acacec0511163edf79,
title = "DEFENDER: A decomposer for queries against federations of endpoints",
abstract = "We present DEFENDER and illustrate the benefits of identifying promising query decompositions and efficient plans that combine results from federations of SPARQL endpoints. DEFENDER is a query decomposer that implements a two-fold approach. First, triple patterns in a SPARQL query are decomposed into simple sub-queries that can be completely executed on one endpoint. Second, sub-queries are combined into a feasible bushy tree plan where the number of joins is maximized and the height of tree is minimized. We demonstrate DEFENDER and compare its performance with respect to state-of-the-art RDF engines for queries of diverse complexity, networks with different delays, and dataset differently distributed among a variety of endpoints.",
author = "Gabriela Montoya and Vidal, \{Maria Esther\} and Maribel Acosta",
note = "Publisher Copyright: {\textcopyright} Springer-Verlag Berlin Heidelberg 2015.; Extended Semantic Web Conference on Satellite Events, ESWC 2012 ; Conference date: 27-05-2012 Through 31-05-2012",
year = "2015",
doi = "10.1007/978-3-662-46641-4\_49",
language = "English",
isbn = "9783662466407",
series = "Lecture Notes in Computer Science",
publisher = "Springer Verlag",
pages = "480--484",
editor = "Elena Simperl and Barry Norton and Dunja Mladenic and Valle, \{Emanuele Della\} and Irini Fundulaki and Alexandre Passant and Raphael Troncy",
booktitle = "The Semantic Web",
}