I am going through this right now. We are producing 1 TB per year and have to run a few SQL queries per week. Some people in corporate IT have sold our management on Hadoop and now the whole project has turned from super simple storing into a SQL database into this crazy cycle of writing requirements for IT for every little thing. We are not even allowed to write directly into Hadoop but have to go through their badly defined API.

I have run a SQL database on a USB disk with the same data without problems but some people are just attached to the idea of "big data" so Hadoop it.