Databases and Information Systems
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Map-Side Merge Join for MapReduce

We provide an adaption of the classical sort-merge join for MapReduce, which we introduce as an optimization for our RDFPath MapReduce Processor.

Related Publications

  • Martin Przyjaciel-Zablocki, Alexander Schätzle, Eduard Skaley, Thomas Hornung, Georg Lausen:
    Map-Side Merge Joins for Scalable SPARQL BGP Processing.pdf ]
    Proc. of the 5th IEEE International Conference on Cloud Computing Technology and Science, (CloudCom 2013). Bristol (UK).


  • Hadoop, we recommend Cloudera's Distribution of Hadoop CDH4, the implementation is tested with CDH 4.1.2
  • Java Version 6
  • RDF data in NTriples format


Files Description
Merge Join v0.2 Readme and binaries Download


You can also checkout the source code of MapMerge from the following subversion repository.
(username: anonymous, password: anonymous)

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