Strategic and suave processing for performing similarity joins using MapReduce
An efficient MapReduce Algorithm for performing Similarity Joins between multisets is proposed. Filtering techniques for similarity joins minimize the number of pairs of entities joined and hence improve the efficiency of the algorithm. Multisets represent real-world data better by considering the frequency of its elements. Prior serial algorithms incorporate filtering techniques only for sets, but not multisets, while prior MapReduce algorithms do not incorporate any filtering technique or inefficiently and unscalably incorporate prefix filtering. This work extends the filtering techniques, namely the prefix, size and positional to multisets, and also achieves the challenging task of efficiently incorporating them in the shared-nothing MapReduce model, thereby minimizing the pairs generated and joined, resulting in I/O, network and computational efficiency. A technique to enhance the scalability of the algorithm is also presented as a contingency need. Algorithms are developed using Hadoop and tested using real-world Twitter data. Experimental results demonstrate unprecedented performance gain.
similarity joins mapreduce multisets