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Distributed Keyword Search over RDF via MapReduce

  • Roberto De Virgilio
  • Antonio Maccioni
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8465)

Abstract

Non expert users need support to access linked data available on the Web. To this aim, keyword-based search is considered an essential feature of database systems. The distributed nature of the Semantic Web demands query processing techniques to evolve towards a scenario where data is scattered on distributed data stores. Existing approaches to keyword search cannot guarantee scalability in a distributed environment, because, at runtime, they are unaware of the location of the relevant data to the query and thus, they cannot optimize join tasks. In this paper, we illustrate a novel distributed approach to keyword search over RDF data that exploits the MapReduce paradigm by switching the problem from graph-parallel to data-parallel processing. Moreover, our framework is able to consider ranking during the building phase to return directly the best (top-k) answers in the first (k) generated results, reducing greatly the overall computational load and complexity. Finally, a comprehensive evaluation demonstrates that our approach exhibits very good efficiency guaranteeing high level of accuracy, especially with respect to state-of-the-art competitors.

Keywords

#eswc2014Virgilio 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Roberto De Virgilio
    • 1
  • Antonio Maccioni
    • 1
  1. 1.Dipartimento di IngegneriaUniversitá Roma TreRomeItaly

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