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You can read the source code yourself. I don't remember the database, but it's running on an Arc server.

Being proxied to Server:Apache/2.2.8 (Ubuntu) fyi

edit: I don't think the page itself is actually proxied it seems only the static content is.

If the app is behind apache and writing static files for serving things up, and only hitting arc on operations like votes and cache misses then of course it's gonna scale! Especially if the app is read heavy :)

Is the HN source code actually open source itself?

yes its in the arc source

I have taken a look at the source, but wasn't sure if they were using all of it in production. If they are then quite impressive.

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