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Thanks for the writeup. It seems Heroku could implement easily a two-layer routing mesh to accomplish what you describe thought.



I think that is the wrong conclusion. You still have the problem of having to design a system where the dynos communicate their queues to the second layer of the routing mesh.

The solution is to have dynos large enough that you can run 8+ workers and let the operating system do all the complex scheduling.


> and let the operating system do all the complex scheduling.

So Heroku could spawn workers with a $FD environment variable instead of $PORT and the "complex scheduling" done by the OS _is_ the second routing layer.

But really, they could still do a second level routing even outside a single OS as the scale of the distribution is much smaller, so having the routing mesh be aware of the worker availability seems feasible again.




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