While it’s true that the switch to random routing didn’t “degrade” performance on Cedar, that’s only because Cedar always used random routing and therefore always had terrible performance for Rails applications on thin (and other non-concurrent web servers)
Note that thin is the default web server on Cedar, so by default your Rails Cedar app will perform poorly. And of course you won’t even know it because the degradation in performance is caused by queuing that’s not measured by Heroku’s logs or New Relic
“Yesterday” (2/13/2013) is inaccurate – I started discussing the issue with Adam Wiggins (Heroku’s CTO) on 2/5/2013, and sent him the simulation results on 2/8/2013.
On 2/11/2013 he responded with an email that said:
I’m convinced that the best path forward is for one of your developers to work closely with [redacted] to modernize and optimize your web stack. If you invest this time I think it’s very likely you’ll end up with an app that performs the way you want it to at a price within your budget.
You’re correct, the routing mesh does not behave in quite the way described by the docs. We’re working on evolving away from the global backlog concept in order to provide better support for different concurrency models, and the docs are no longer accurate. The current behavior is not ideal, but we’re on our way to a new model which we’ll document fully once it’s done.
In the meantime, you shouldn’t have any difficulties as long as you keep your web requests short (less than about 500ms), which is good practice anyway.
Sorry for any difficulty or confusion, and thanks for digging in and providing such a detailed analysis.
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