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"Jepsen aims to improve the safety of distributed databases, queues, consensus systems, etc. We maintain an open source library for safety testing, and publish free, in-depth analyses of specific systems. In each analysis we explore whether the system lives up to its documentation’s claims, file new bugs, and suggest recommendations for operators. In addition to paid analysis, Jepsen offers technical talks, training classes, and consulting services."

"Jepsen pushes vendors to make accurate claims and test their software rigorously, helps users choose databases and queues that fit their needs, and teaches engineers how to evaluate distributed systems correctness for themselves."

"We have several tricks for efficiently checking the consistency of transactions over primary keys, but what are we to do about predicates? Database histories with predicates are particularly tricky because their correctness hinges on the entire universe of objects, not just those objects which matched the predicate. When a query for all even objects returns the empty set, is that because it selected the unborn version of x, or one in which x = 1? There are many possibilities, each resulting in a different dependency graph. The proliferation of these graphs may be intractable, unless we find a way to prove exactly which invisible version was selected."

"If you’d like to talk about this problem, come to Bugbash 2026 on April 22-24th, in Washington, DC. Jepsen’s seminar, “Paranormal forms”, will introduce the problem of predicate checking, suggest a few possibilities, then open the floor to discussion."

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