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I'll be interested to see what Jepsen[1] makes of this. MongoDB traditionally lost a lot of data when there was a split-brain in the network. According to the post, AWS is a re-implementation of MongoDB v3. Will Amazon's implementation fare any better?

[1]: https://aphyr.com/posts/284-call-me-maybe-mongodb

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Michael here from MongoDB - I can't answer your question about DocumentDB and Jepsen, but there is a more recent analysis from Jepsen: https://jepsen.io/analyses/mongodb-3-4-0-rc3. DocumentDB is built on Aurora, so the architecture is completely different.

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