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Web applications that combine dynamic data stream with distributed background data are getting a growing attention in recent years. Answering in a timely fashion, i.e., reactiveness, is one of the most important performance indicators for those applications. The Semantic Web community showed that RDF Stream Processing (RSP) is an adequate framework to develop this type of applications. However, RSP engines may lose their reactiveness due to the time necessary to access the background data when it is distributed over the Web. State-of-the-art RSP engines remain reactive using a local replica of the background data, but it progressively becomes stale if not updated to reflect the changes in the remote background data. For this reason, recently, the RSP community has investigated maintenance policies of the local replica that guarantee reactiveness while maximizing the freshness of the replica. Previous works simplified the problem with several assumptions. In this paper, we investigate how to remove some of those simplification assumptions. In particular, we target a class of queries for which multiple policies may be used simultaneously and we show that rank aggregation can be effectively used to fairly consider their alternative suggestions. We provide extensive empirical evidence that rank aggregation is key to move a step forward to the practical solution of this problem in the RSP context.

Fri 23 Jun

Displayed time zone: Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna change

10:30 - 12:10
Session 5: Learning, Automation and IntegrationDEBS Research Papers at Sala d'Actes, Vertex Building
Chair(s): Martin Hirzel IBM Research
10:30
25m
Talk
Event Forecasting with Pattern Markov Chains. (Research Paper)
DEBS Research Papers
Elias Alevizos NCSR Demokritos, Institute of Informatics and Telecommunications, Alexander Artikis University of Pireaus and NCSR "Demokritos", Georgios Paliouras Institute of Informatics & Telecommunications, NCSR "Demokritos"
10:55
25m
Talk
Automatic Learning of Predictive CEP Rules: Bridging the Gap between Data Mining and Complex Event Processing. (Research Paper)
DEBS Research Papers
Raef Mousheimish DAVID lab, University of Versailles, Yehia Taher DAVID - UVSQ, Karine Zeitouni University of Versailles-Saint-Quentin
11:20
20m
Talk
An Event-based Capture-and-Compare Approach to Support the Evolution of Systems of Systems. (Experience Paper)
DEBS Research Papers
Jürgen Thanhofer-Pilisch Christian Doppler Lab. MEVSS, Johannes Kepler University Linz, Rick Rabiser Christian Doppler Lab. MEVSS, Johannes Kepler University Linz, Thomas Krismayer Christian Doppler Lab. MEVSS, Johannes Kepler University Linz, Michael Vierhauser University of Notre Dame, Paul Grünbacher , Stefan Wallner Primetals Technologies Austria GmbH, Klaus Seyerlehner Primetals Technologies Austria GmbH, Helmut Zeisel Primetals Technologies Austria GmbH
11:40
20m
Talk
Using Rank Aggregation in Continuously Answering SPARQL Queries on Streaming and Quasi-static Linked Data. (Experience Paper)
DEBS Research Papers
Shima Zahmatkesh Politecnico di Milano, Emanuele Della Valle DEIB, Politecnico di Milano, Daniele Dell'Aglio IFI, University of Zurich