Big Data Preprocessing as the Bridge between Big Data and Smart Data: BigDaPSpark and BigDaPFlink Libraries

Abstract

With the advent of Big Data, terabytes of data are generated and stored every second. This raw data is far from being perfect, it contains many imperfections (noise, missing values, etc.) and is not suitable for analysis, as it will led to wrong conclusions. Data preprocessing is the set of techniques devoted to polish, clean, fix, and improve that raw data. With this preprocessed data, we would be able to find more patterns in it, and to better explain the underlaying distribution of the data. This is what is called Smart Data, raw data that has been preprocessed and is ready for being analyzed, data that contains valuable information that will led to knowledge. In this work, we present two Big Data libraries for achieving Smart Data from Big Data, BigDaPSpark and BigDaPFlink. They are built on top of two Big Data frameworks, Apache Spark and Apache Flink. Both libraries contain a series of algorithms for Big Data preprocessing, ranging from noise cleaning, to discretization, or data reduction, among many others. Additionally, we ilustrate the usage of the libraries with two cases of use.