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Issue No.09 - September (2011 vol.23)
pp: 1312-1327
Mohammad Farhan Husain , University of Texas at Dallas, Richardson
James McGlothlin , University of Texas at Dallas, Richardson
Mohammad Mehedy Masud , University of Texas at Dallas, Richardson
Latifur R. Khan , University of Texas at Dallas, Richardson
Bhavani Thuraisingham , University of Texas at Dallas, Richardson
Semantic web is an emerging area to augment human reasoning. Various technologies are being developed in this arena which have been standardized by the World Wide Web Consortium (W3C). One such standard is the Resource Description Framework (RDF). Semantic web technologies can be utilized to build efficient and scalable systems for Cloud Computing. With the explosion of semantic web technologies, large RDF graphs are common place. This poses significant challenges for the storage and retrieval of RDF graphs. Current frameworks do not scale for large RDF graphs and as a result do not address these challenges. In this paper, we describe a framework that we built using Hadoop to store and retrieve large numbers of RDF triples by exploiting the cloud computing paradigm. We describe a scheme to store RDF data in Hadoop Distributed File System. More than one Hadoop job (the smallest unit of execution in Hadoop) may be needed to answer a query because a single triple pattern in a query cannot simultaneously take part in more than one join in a single Hadoop job. To determine the jobs, we present an algorithm to generate query plan, whose worst case cost is bounded, based on a greedy approach to answer a SPARQL Protocol and RDF Query Language (SPARQL) query. We use Hadoop's MapReduce framework to answer the queries. Our results show that we can store large RDF graphs in Hadoop clusters built with cheap commodity class hardware. Furthermore, we show that our framework is scalable and efficient and can handle large amounts of RDF data, unlike traditional approaches.
Hadoop, RDF, SPARQL, MapReduce.
Mohammad Farhan Husain, James McGlothlin, Mohammad Mehedy Masud, Latifur R. Khan, Bhavani Thuraisingham, "Heuristics-Based Query Processing for Large RDF Graphs Using Cloud Computing", IEEE Transactions on Knowledge & Data Engineering, vol.23, no. 9, pp. 1312-1327, September 2011, doi:10.1109/TKDE.2011.103
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