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by niemeyer 4176 days ago
There are further details about how it works in this blog post:

http://blog.labix.org/2012/08/22/multi-doc-transactions-for-...

While it does work, it's still a workaround for the lack of first-class transactions in MongoDB. It offers a more limited API and requires care on the developer side.

Despite being the author, I do hope it gets obsoleted by more convenient first-class transaction support in MongoDB itself at some point in the near future.