Big advantage of Hadoop is that you do not need to pay license fees which in case of relational databases can reach into tens of thousands dollars. The big dis

Big advantage of Hadoop is that you do not need to pay license fees which in case of relational databases can reach into tens of thousands dollars. The big disadvantage is that Hadoop is two orders of magnitude slower than relational databases. Also, Hadoop clusters are not what one would call a "green" solution. More like a terrible waste of computing resources.