I just interviewed for a big data company. I think I did reasonably well even though I didn't get the job. While many people working there were from CS backgrounds, there was a small group in the Informatics department called Analytics. Not one of the four people in it came from a CS background. They didn't seem overly concerned about the lack of experience with the specific technologies (Hadoop, MapReduce, etc.), though I'm sure that would have helped. I was able to puzzle through their 'technical' questions reasonably quickly since they didn't rely too much on specific knowledge of a field.
Note that I am/was an experimental physicist whose done my fair share of modeling along the way, but mostly a lot of data collection and analysis. I also have a Ph.D. The head of the group also had a Ph.D., but in Applied Math.
I would also like to note this obvious point about technology. It's a quickly moving target. Hadoop hadn't even been invented and 'big data' wasn't a thing when I was in college. Heck, Hadoop came around past the half way point of my graduate experience. I think Hadoop and the like are good skills to have for the market NOW, but who knows what it will be like in 5 or 10 years.
This is just my take based on my brief experience. I'll also just throw out there that most of my friends and associates who specialized in computation physics, albeit at the Ph.D. level, are all gainfully employed and seem to have less trouble then the experimentalists finding work and transitioning to other fields.