Cloud Computing and Big Data 7th Conference, JCC&BD 2019, La Plata, Buenos Aires, Argentina, June 24-28, 2019, Revised Selected Papers - Naiouf, Marcelo; Naiouf, Marcelo; Chichizola, Franco; Chichizola, Franco; Rucci, Enzo; Rucci, Enzo (Springer International Publishing : Imprint: Springer, 2019)