AyubOpen
Elixir rest api returning 504 Gateway Time-out
during high load I see the rest api or even the welcome page localhost:4000 returns 504 Gateway Time-out error, I am usng OTP 20. Any clues how to improve performance
Elixir 1.7.3 (compiled with Erlang/OTP 20)
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NobbZ
When you hit phoenix directly, it should never ever give you a 504, as it not acts as a gateway…
OvermindDL1
Would need more information. I’ve seiged my server with over a 30k requests per second on 2-cores without an incorrect result (and after that it just slows down a lot more but still no incorrect, dropped, or invalid responses).
If it’s a 504 Gateway Time-out that sounds like there is a front-loader/gateway in front of Elixir and it is what’s getting overwhelmed (perhaps it has only a single connection open to the backend server?).
What is the gateway program, what defines ‘high load’, what is the gateway’s configuration for the reverse proxy, what are the hardware specs, etc… etc… 
NobbZ
Do you have any issues, when you hit your application without any MITMs?
Do you have any issues when you hit your NGINX without any MITMs?
Do you have any issues when you use some MITM CDN?
Do you use free or paid plans?
My current experience with CDN providers like CloudFlare is to simply avoid them. They add hard to debug overhead without much benefit. Much more important is to have the servers “near” to the expected clients.
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