Comment by demosthanos

Comment by demosthanos 6 months ago

And if you need that kind of persistent immediately reactive connection and are willing to pay the price, go for it! If that's truly a requirement for you then you're in the subset of web that overlaps substantially with telecoms.

I'm not cautioning against making the calculated decision that realtime is a core requirement and choosing the BEAM accordingly. I'm cautioning against positioning the BEAM as being designed for web use cases in general, which it's not.

Many projects, including GitHub, do not need that kind of immediate reactivity and would not have benefited enough from the BEAM to be worth the trade-offs involved. A single example of a UX flow that could be made slightly better by rearchitecting for realtime isn't sufficient reason to justify an entirely different architecture. Engineering is about trade-offs, and too often in our field we fall for "when all you have is a hammer". Realtime architectures are one tool in a toolbox, and they aren't even the most frequently needed tool.

throwawaymaths 6 months ago

"willing to pay the price"

what price? learning a new language that is designed to be learned from the one you already know with fewer footguns? ok fine.

but you make it seem like going to elixir is some kind of heavy lift or requires a devops team or something. the lift is low: for example i run a bespoke elixir app in my home on my local network for co2 monitoring.

and for that purpose (maybe 300 lines of code? yes, i do want reactivity. wrangling longpoll for that does not sound fun to me.

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demosthanos 6 months ago

To name just a few costs that aren't worth it for many businesses:
* A much smaller ecosystem of libraries to draw from.
* Much weaker editor tooling than with more established languages.
* An entirely different paradigm for deployments, monitoring, and everything else that falls under "operations" that may be incompatible with the existing infrastructure in the organization.
* When something does go wrong, using a weird stack means you have less institutional knowledge to lean on and fewer resources from people who've been doing the same thing as you.
* A whole new set of foot guns to dodge and UX problems to solve related to what happens when someone's connection is poor. This has come up repeatedly in discussions of Phoenix LiveView—what you get in reactivity comes at the expense of having to work harder to engineer for spotty connections than you would with a request/response model.
* More difficulty hiring people, and an increased tendency when hiring for selecting people who are really just obsessed with a particular tool and unwilling to see when the situation calls for something else.
There are many more, these are just the ones I can think of without having a concrete application with concrete requirements to analyze. In the end for most apps reactivity is so much a "nice to have" that it's hardly worth sacrificing the stability and predictability of the established option for moderately better support for that one aspect of UX, especially given that you can always add reactivity later if you need to at a slightly higher cost than it would have come at with Erlang.
If reactivity is a core requirement, that's a different story. If it's polish, don't choose your architecture around it.

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- jiggawatts 6 months ago
  
  When José Valim “moved on” from Ruby development to work on Elixir, his fans followed.
  It’s a bit like true believers switching faiths when their leader changes religions.
  It’s hard to make sense of it from the outside looking in, but it’s definitely a thing that happened historically and occurs in small and big ways even today.
  
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  throwawaymaths 6 months ago
  
  i had never heard of jose until i started working in elixir. i had about two years of grueling ruby experience[0] and boy was elixir an amazing breath of fresh air.
  what is also a thing is stockholm syndrome and sunk cost fallacy.
  [0] ok, now that i think about it also this was when ruby was having serious 1.84-2.0 transition troubles and i had difficulty reinstalling ruby if i needed to redo the os because some python wheel broke everything, so i had other historical reasons to leave ruby with a bad taste in my mouth. i think my gripes about activerecord are real, though.
  
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