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The issue isn't that MongoDB is eventually consistent, it's that the documentation claims that in some cases it's strictly consistent[1] while Kyle found that:

"MongoDB, even at the strongest consistency levels, allows reads to see old values of documents or even values that never should have been written."

1. http://docs.mongodb.org/manual/reference/glossary/#term-stri...

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I didn't say Eventual Consistency. I said Occasional Consistency. MongoDB is has hard Occasional Consistency. Indeed, it is the most occasionally consistent database I know of. I once wrote a few million records into Mongo. It was consistent before the write, but never again after.

Great for sub-linear time algorithms! At that point, all my algorithms ran at less than O(n) on the size of the data I had written in.

From a business perspective, Occasional Consistency is also a very nice property if you are storing audit data for certain types of organizations. It gives complete plausible deniability about rule compliance.

Heh, Poe's Law, etc :)

I guess you could also call it Quantum Consistency.

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