I've been wondering about the internals for a while, and only had a brief notion of what it was like. Thanks for doing all this research!

Well done sir.

The routing mesh is less discriminating than you might think. There is no "global queue".

I thought it was terrific that you did this - I emailed the answer to myself so I can read it on the bus...

It looked like you did a lot of research into it based on the sources you posted.

How long did it take you to create that post?

What is your primary area of interest -- If I post a question about some other infrastructure, would you give such a detailed response, or was this a one-off?

It took maybe 4 hours, but it was fun and I learned a lot (not just about Heroku).

I've been using Heroku since near the beginning (we were in YC W08 together) so I was already vaguely familiar with the architecture. It was mostly filling in the details.

Infrastructure is a side interest that I'm trying to learn more about, so I can't guarantee I'll be able to answer your questions, but it's worth posting them anyway. Hopefully other people can answer as well (of course that's what I thought when I posted the Heroku question... I ended up answering it myself)

Rather than directing the question at me, just post a normal question on Quora, and post the link here or message me.

Might be worth noting that Heroku has released Doozer as an open source project and link to its home at: https://github.com/ha/doozer

It's already mentioned in the answer under "misc tech". I couldn't find a lot of info on how Doozer is actually used at Heroku though.