%0 Conference Paper %B Proceedings of the ISWC 2013 Posters & Demonstrations Track %D 2013 %T D-SPARQ: Distributed, Scalable and Efficient RDF Query Engine %A Raghava Mutharaju %A Sherif Sakr %A Alessandra Sala %A Pascal Hitzler %E Eva Blomqvist %E Tudor Groza %K D-SPARQ %K Distributed Querying %K Scalable RDF querying %K SPARQL %X

We present D-SPARQ, a distributed RDF query engine that combines the MapReduce processing framework with a NoSQL distributed data store, MongoDB. The performance of processing SPARQL queries mainly depends on the efficiency of handling the join operations between the RDF triple patterns. Our system features two unique characteristics that enable efficiently tackling this challenge: 1) Identifying specific patterns of the input queries that enable improving the performance by running different parts of the query in a parallel mode. 2) Using the triple selectivity information for reordering the individual triples of the input query within the identified query patterns. The preliminary results demonstrate the scalability and efficiency of our distributed RDF query engine.

%B Proceedings of the ISWC 2013 Posters & Demonstrations Track %I CEUR-WS.org %C Sydney, Australia %V 1035 %P 261–264 %G eng %U http://ceur-ws.org/Vol-1035/iswc2013_poster_21.pdf %0 Conference Paper %B Proceedings of the ISWC 2013 Posters & Demonstrations Track, Sydney, Australia, October 23, 2013 %D 2013 %T Editing R2RML Mappings Made Easy %A Kunal Sengupta %A Peter Haase %A Michael Schmidt %A Pascal Hitzler %E Eva Blomqvist %E Tudor Groza %B Proceedings of the ISWC 2013 Posters & Demonstrations Track, Sydney, Australia, October 23, 2013 %I CEUR-WS.org %V 1035 %P 101–104 %G eng %0 Conference Paper %B Proceedings of the ISWC 2013 Posters & Demonstrations Track, Sydney, Australia, October 23, 2013 %D 2013 %T Linked Scientometrics: Designing Interactive Scientometrics with Linked Data and Semantic Web Reasoning %A Grant McKenzie %A Krzysztof Janowicz %A Yingjie Hu %A Kunal Sengupta %A Pascal Hitzler %E Eva Blomqvist %E Tudor Groza %B Proceedings of the ISWC 2013 Posters & Demonstrations Track, Sydney, Australia, October 23, 2013 %I CEUR-WS.org %V 1035 %P 53–56 %G eng %0 Conference Paper %B Proceedings of the ISWC 2013 Posters & Demonstrations Track, Sydney, Australia, October 23, 2013 %D 2013 %T Optique 1.0: Semantic Access to Big Data: The Case of Norwegian Petroleum Directorate's FactPages %A Evgeny Kharlamov %A Martin Giese %A Ernesto Jiménez-Ruiz %A Martin G. Skjæveland %A Ahmet Soylu %A Dmitriy Zheleznyakov %A Timea Bagosi %A Marco Console %A Peter Haase %A Ian Horrocks %A Sarunas Marciuska %A Christoph Pinkel %A Mariano Rodriguez-Muro %A Marco Ruzzi %A Valerio Santarelli %A Domenico Fabio Savo %A Kunal Sengupta %A Michael Schmidt %A Evgenij Thorstensen %A Johannes Trame %A Arild Waaler %E Eva Blomqvist %E Tudor Groza %B Proceedings of the ISWC 2013 Posters & Demonstrations Track, Sydney, Australia, October 23, 2013 %I CEUR-WS.org %V 1035 %P 65–68 %G eng