The Large-scale Dynamic Data Rapid Reduction Algorithm Based on Map-Reduce

With the advent of the era of “Big Data”, the application of the large-scale data is becoming popular. Efficiently using and analyzing the data has become an interesting research topic. Traditional knowledge reduction algorithms read small data samples once into a computer main memory for reduction, but it is not suitable for large-scale data. This paper takes large-scale sensor monitoring dynamic data as the research object and puts forward an incremental reduction algorithm based on Map-Reduce. Using a Hash fast partitioning strategy this algorithm divides the dynamic data set into multiple subdatasets to compute, which has greatly reduced the calculation time and space complexity of each node. Finally,experiments are conducted on the data from UCI Machine Learning Repository using Hadoop platform to prove that the algorithm is efficient and suitable for large-scale dynamic data. Compared to the traditional algorithms, the highest speedup of the parallel algorithm can be increased up to 1.55 times.