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While you are correct that 3.4 now passes, I feel like your interpretation here is a bit optimistic. It's not like I tested Mongo and it passed out of the box--
by aphyr 10y ago
While you are correct that 3.4 now passes, I feel like your interpretation here is a bit optimistic. It's not like I tested Mongo and it passed out of the box--it failed Jepsen tests, and not just with a read anomaly--it lost majority-acknowledged inserts. The v0 protocol still fails--it's fundamentally broken. The v1 bugs are fixed now, but that's a consequence of our collaboration.
I'd say the marker of maturity here is that MongoDB has put significant time and effort into correctness: they take clock skew and network partitions as serious failure modes, they've redesigned their replication protocol, added options for stronger reads, and invested in their own correctness test suite, and Jepsen tests, as a part of their CI process.
- VeejayRampay 10y agoI'd like to use the occasion to thank you for the service you provide to the community. The tests themselves, the collaboration with vendors, the competition it fosters and the in-depth technical write-ups I think push the whole ecosystem forward, which everyone eventually benefits from. Much obliged.
- aphyr 10y agoThanks. :)
- CJefferson 10y agoI agree -- I think the two most important people currently in software are aphyr for database testing, and lcamtuf for fuzzing (AFL). Both are pushing important fundamental software to pass the kind of tests it's embarrassing we haven't been doing for the past 20 years. I mean that in the most positive way, it's hard to get people to do things they've been neglecting for so long!