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Title should be fixed to "MapReduce is not the answer--if the question comes from an interview at my company." Zero content, let's move on.
You can make sure the candidate knows it's a basic question by simply saying so. If the point really is to make the person feel at ease, that reassurance will be even more helpful. Say:

Don't overthink this one, I just want a solution.

That should work wonders and will be more effective than ranting on your blog.