International Semantic Web Conference

ISWC 2013: The Semantic Web – ISWC 2013 pp 277-293

SPARQL Web-Querying Infrastructure: Ready for Action?

  • Carlos Buil-Aranda
  • Aidan Hogan
  • Jürgen Umbrich
  • Pierre-Yves Vandenbussche
Conference paper

DOI: 10.1007/978-3-642-41338-4_18

Volume 8219 of the book series Lecture Notes in Computer Science (LNCS)
Cite this paper as:
Buil-Aranda C., Hogan A., Umbrich J., Vandenbussche PY. (2013) SPARQL Web-Querying Infrastructure: Ready for Action?. In: Alani H. et al. (eds) The Semantic Web – ISWC 2013. ISWC 2013. Lecture Notes in Computer Science, vol 8219. Springer, Berlin, Heidelberg

Abstract

Hundreds of public SPARQL endpoints have been deployed on the Web, forming a novel decentralised infrastructure for querying billions of structured facts from a variety of sources on a plethora of topics. But is this infrastructure mature enough to support applications? For 427 public SPARQL endpoints registered on the DataHub, we conduct various experiments to test their maturity. Regarding discoverability, we find that only one-third of endpoints make descriptive meta-data available, making it difficult to locate or learn about their content and capabilities. Regarding interoperability, we find patchy support for established SPARQL features like ORDER BY as well as (understandably) for new SPARQL 1.1 features. Regarding efficiency, we show that the performance of endpoints for generic queries can vary by up to 3–4 orders of magnitude. Regarding availability, based on a 27-month long monitoring experiment, we show that only 32.2% of public endpoints can be expected to have (monthly) “two-nines” uptimes of 99–100%.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Carlos Buil-Aranda
    • 1
  • Aidan Hogan
    • Jürgen Umbrich
      • 2
    • Pierre-Yves Vandenbussche
      • 2
    1. 1.Department of Computer SciencePontificia Universidad Católica de ChileChile
    2. 2.Fujitsu (Ireland) Limited, Swords, Co.DublinIreland