Map-reduce extensions and recursive queries

  • Authors:
  • Foto N. Afrati;Vinayak Borkar;Michael Carey;Neoklis Polyzotis;Jeffrey D. Ullman

  • Affiliations:
  • National Technical University, Athens, Greece;UC Irvine;UC Irvine;UC Santa Cruz;Stanford University

  • Venue:
  • Proceedings of the 14th International Conference on Extending Database Technology
  • Year:
  • 2011

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Abstract

We survey the recent wave of extensions to the popular map-reduce systems, including those that have begun to address the implementation of recursive queries using the same computing environment as map-reduce. A central problem is that recursive tasks cannot deliver their output only at the end, which makes recovery from failures much more complicated than in map-reduce and its nonrecursive extensions. We propose several algorithmic ideas for efficient implementation of recursions in the map-reduce environment and discuss several alternatives for supporting recovery from failures without restarting the entire job.