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To everybody who uses MapReduce: what problems do you solve?

At the time I’m reading this Ask HN: To everybody who uses MapReduce: what problems do you solve?, there aren’t many interesting answers.

✚ Compare it with AskReddit: What is an invention that the human race is fully capable of making, but hasn’t been made yet?

Original title and link: To everybody who uses MapReduce: what problems do you solve? (NoSQL database©myNoSQL)