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How to scale out a Phoenix application with websocket

Foreword

It's relatively easy to scale out stateless web applications. You often only need a reverse proxy. But for those stateful web applications, especially those applications that embeds websocket services in them, it's always a pain to distribute them in a cluster. The traditional way is introducing some external services like Redis to handle pubsub, however, in such way, you often need to change your code. Can Erlang/Elixir, the "concurrency oriented programming languages", best other languages in this use case? Has Phoenix framework already integrated the solution of horizontally scaling websocket? I'll do an experiment to prove (or disprove) that.

Resources

How to add a collapsible section in markdown

1. Example

Click me

Heading

Foo
Bar
- Baz

Qux

Elixir Notes

Misc notes

String concatenation:

Hopefully this may speed your groking of the forking torturing Y Combinator a little bit.

Disclaimer: I don't assert what I say here is accurate, or even correct (I'm not authorative, obviously), but it's my understanding and I'm sharing in the hope that someone who also struggles on the Y Combinator may benefit a tad.

Prerequisite Understandings

In Lambda Caculus, everything is a Lambda Caculus (Anonymous function that takes one parameter). And the best thing is that, ... drump roll ..., it's Turing Complete. So theoretically, it can caculate anything a computer can.
In this note, I use the term function, which (I think) means Lambda Caculus, to sound (at least to myself) more accustomed.

The definition of Y Combinator

Y = λf.(λx.f (x x)) (λx.f (x x))

Elixir Resources

Resource Lists
- Awesome Elixir Resource List https://github.com/h4cc/awesome-elixir
- Elixir Talks https://github.com/elixir-lang/elixir/wiki/Talks
- Phoenix Framework http://www.phoenixframework.org/
- Elixir Official Site http://elixir-lang.org/

	// extract from TELENOR https://ecaf.telenor.com.mm/?orcf=1&lang=my

	const townships = [
	[
	"AhGaYa",
	"BaMaNa",
	"DaHpaYa",
	"HaPaNa",
	"HpaKaNa",
	"KaMaNa",

	#! /usr/bin/env ruby

	# NOTE: Requires Ruby 2.1 or greater.

	# This script can be used to parse and dump the information from
	# the 'html/contact_info.htm' file in a Facebook user data ZIP download.
	#
	# It prints all cell phone call + SMS message + MMS records, plus a summary of each.
	#
	# It also dumps all of the records into CSV files inside a 'CSV' folder, that is created

	defmodule StableMatching.Preference do
	@enforce_keys [:id, :prefers]
	defstruct id: nil, prefers: []
	end

	defmodule StableMatching.GaleShapley do
	alias StableMatching.Preference

	@doc """
	Solves [stable matching problem](https://en.wikipedia.org/wiki/Stable_marriage_problem#Algorithm)

	<html>
	<body>
	<h2>Privacy Policy</h2>
	<p>[Individual or Company Name] built the [App Name] app as a [open source \| free \| freemium \| ad-supported \| commercial] app. This SERVICE is provided by [Individual or company name] [at no cost] and is intended
	for use as is.</p>
	<p>This page is used to inform website visitors regarding [my\|our] policies with the collection, use, and
	disclosure of Personal Information if anyone decided to use [my\|our] Service.</p>
	<p>If you choose to use [my\|our] Service, then you agree to the collection and use of information in
	relation with this policy. The Personal Information that [I\|we] collect are used for providing and
	improving the Service. [I\|We] will not use or share your information with anyone except as described

	// Basic Operators
	35 + 98
	62 - 14
	50 / 10
	463 * 173


	// Types
	var age: Int = 21 // Int = Integer = Any whole number
	var milesCanRun: Double = 0.75 // Double = Float = Decimal Number