Several years ago my Pointy-haired Boss was reading technology articles (bad idea) and caught the "Big Data" bug. It spread to our CTO, CIO and all department heads like wildfire. This led to our Development team being turned into NoSQL zombies who said words like "Hadoop", "Shark", "Spark" in response to any new product requirement. It was a glorious vision of a magical backend system that would take all our data from every platform, that would scale up and out forever, and could be asked any question and give us exactly the results we wanted all instantly. The fact no one in the entire company had ever used any of the technology before or the fact we didn't even have any Java experience to setup even the base Hadoop installation were just minor points not worth discussing. I would like to say I was the lone dissenting voice, well I was and said lets just stick to SQL, but even I got caught up in the hype eventually.
18 months later and a sickening amount of man-years wasted and contractor money spent with no usable products or services the conclusion was NoSQL isn't a good fit for our data or platform use case. So they all went back to standard MySQL and completed 90% of the delayed projects in under 4 weeks.
On the plus side management heads did roll. I have a new My Pointy-haired Boss and CTO. However they have now started to drop in the words "Microservices" and "Docker" into all discussions. I can see a new hype-train arriving shortly