Jepsen Disputes MongoDB’s Data Consistency Claims

guest · May 23, 2020

Jepsen Disputes MongoDB’s Data Consistency Claims
May 22, 2020
https://www.infoq.com/news/2020/05/Jepsen-MongoDB-4-2-6/

In an article titled MongoDB and Jepsen, MongoDB claimed that their database passed “the industry’s toughest data safety, correctness, and consistency Tests”. In response, Jepsen published an article stating that MongoDB 3.6.4 had in fact failed their tests; the newer MongoDB 4.2.6 has more problems including “retrocausal transactions” where a transaction reverses order so that a read can see the result of a future write.

Jepsen LLC’s response begins with this reply to Maxime Beugnet on their official Twitter feed:

I have to admit raising an eyebrow when I saw that web page. In that report, MongoDB lost data and violated causal by default. Somehow that became "among the strongest data consistency, correctness, and safety guarantees of any database available today"!
Transaction Isolation Failures
In recent years MongoDB has been heavily promoting its transactional capabilities. But as Jepsen found, transactional support doesn’t work by default.
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