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k-NN Join Based on LSH in Big Data Environment

  • Ji, Jiaqi (Department of Information Center, Hebei Normal University for Nationalities) ;
  • Chung, Yeongjee (Department of Computer Engineering, Wonkwang University)
  • Received : 2017.12.10
  • Accepted : 2018.01.19
  • Published : 2018.06.30

Abstract

k-Nearest neighbor join (k-NN Join) is a computationally intensive algorithm that is designed to find k-nearest neighbors from a dataset S for every object in another dataset R. Most related studies on k-NN Join are based on single-computer operations. As the data dimensions and data volume increase, running the k-NN Join algorithm on a single computer cannot generate results quickly. To solve this scalability problem, we introduce the locality-sensitive hashing (LSH) k-NN Join algorithm implemented in Spark, an approach for high-dimensional big data. LSH is used to map similar data onto the same bucket, which can reduce the data search scope. In order to achieve parallel implementation of the algorithm on multiple computers, the Spark framework is used to accelerate the computation of distances between objects in a cluster. Results show that our proposed approach is fast and accurate for high-dimensional and big data.

Acknowledgement

Supported by : Wonkwang University

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