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Re:Ask HN: What's your favorite way of getting a web app up ... by jaggederest on Sunday June 03, 2018 @02:32AM (#17218227)
Agreed. I've been working mostly in Ruby since 2006, over hundreds or thousands of apps, depending on how you count, and I have only worked on 2 apps that actually had scaling problems with Ruby. The rest were 100% improperly designed or scaled databases.

Twitter is certainly of a scale that I would not be using Ruby on the primary load points. But even billion dollar companies don't often reach that scale.

Re:Ask HN: What's your favorite way of getting a web app up ... by jaequery on Sunday June 03, 2018 @11:11AM (#17219894)
at twitter’s scale, its not jus ruby, you would also have problems with php, python, node, and maybe even java. only language that will work well at that point are languages built for concurrencies such as scala, elixir, and go.
Re:Ask HN: What's your favorite way of getting a web app up ... by busterarm on Monday June 04, 2018 @08:21AM (#17227038)
Or you break out your infrastructure into smaller components and move the more demanding/critical parts of your infrastructure to that other language and keep everything else you've built!