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Comment by jboggan | Hacker News Reader

Hopefully Coinbase isn't using MongoDB anymore for handling transactions.

I've seen no evidence they were ever using Mongo for transactions. The only references I've seen is that they were using it for the API and such. That could result in things like incorrect balances and improperly telling the user that an action is confirmed or rejected, but it has nothing to do with the actual transactions.

I remember back on BitcoinTalk in 2014 or so when this cropped up, there were people reporting they initiated a withdrawal and their external bank account was credited or debited multiple times with the exact same amount. It wasn't just the API their website was built on.

I was there during that time, and don't recall anyone actually being able to confirm that those issues were due to the underlying DB, but I'll go back and check now that you mention it.

I will say that while I know almost nothing of Coinbase's internals, I have seen enough of two separate exchanges to require a signed NDA. I was intending on working with them to suggest a solution to an issue they were having, and in both cases once I saw their platform I turned around and ran the other direction as quickly as possible.

One of them, I don't mind saying now, was Cryptsy.

you're kidding right?

He's not kidding.

They had to make it webscale!

https://news.ycombinator.com/item?id=5428382

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