Effective and scalable data discovery with NextiaJD

Abstract

We present NextiaJD, a data discovery system with high predictive performance and computational efficiency. NextiaJD aids data scientists in the discovery of datasets that can be crossed. To that end, it proposes a ranking of candidate pairs according to their join quality, which is based on a novel similarity measure that considers both containment and cardinality pro- portions between candidate attributes. To do so, NextiaJD adopts a learning approach relying on profiles. These are succint and informative representations of the schemata and data values of datasets that capture their underlying characteristics. NextiaJD's features are fully integrated into Apache Spark and benefits from it to parallelize the profiling and discovery processes. The on-site demonstration will showcase how NextiaJD can effectively support large-scale data discovery tasks with a large set of datasets the audience will be able to play with.