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Clearly these guys need to stick to commentary on RDBMSs, which MapReduce most definitely is not.

MapReduce enables Google to do it's thing, so I wouldn't call it a "major step backwards".

The fact that Google use MapReduce has no bearing on whether it is a "major step backwards" to the database community. The original authors essentially argue that MapReduce ignores 40 years of database technology, and that it is the worse for it; whether MapReduce is essential at Google isn't the point.

You're absolutely correct here. Wouldn't most users consider the fact that it ignores database research and history a feature of MapReduce?

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