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by delroth 3427 days ago
Piper is not built on top of Mercurial.
1 comments

Sorry, you are right, I got it confused with some other work Google was doing to improve the scalability of mercurial. It's not based on perforce though either, appears to be entirely custom technology.
They first outgrew git, then outgrew perforce and implemented a custom server on top of their usual storage/database stack.