1. Introduction
The Internet of Things (IoT) emerges as a new paradigm leading to profitable approaches, such as autonomous environments [1], [2]. However, the rise of the IoT even worsens the issues regarding data processing and analysis, also known as the Big Data problem, which comprises coping with large data volume, velocity, and variety [3]. In traditional approaches, such as the famous Knowledge Discovery process introduced by Fayyad et al. [4], data is pre-processed, integrated, and then analyzed to extract interesting patterns from it. However, with Big Data, especially originating from the IoT, those traditional approaches are not feasible. The high distribution of data and their heterogeneity lead to the need for new approaches.