Dat Le-Tien keymastervn

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

	### Keybase proof

	I hereby claim:

	* I am keymastervn on github.
	* I am datlee (https://keybase.io/datlee) on keybase.
	* I have a public key whose fingerprint is 9358 A9F2 74FB F6F5 D9C1 2625 2A06 1385 B43E B549

	To claim this, I am signing this object:

	files:
	'/etc/nginx/conf.d/01_proxy.conf':
	mode: '000644'
	owner: root
	group: root
	content: \|
	client_max_body_size 10M;
	'/etc/nginx/default.d/01_locations.conf':
	mode: '000644'
	owner: root

	function mapValues(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	result[key] = fn(obj[key], key);
	return result;
	}, {});
	}

	function pick(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	if (fn(obj[key])) {

	files:
	"/opt/elasticbeanstalk/hooks/appdeploy/pre/09_yarn.sh" :
	mode: "000755"
	owner: root
	group: root
	content: \|
	#!/usr/bin/env bash
	set -xe

	EB_SCRIPT_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k script_dir)

	# frozen_string_literal: true

	require "spec_helper"

	describe PgSearch::Multisearch do
	with_table "pg_search_documents", &DOCUMENTS_SCHEMA

	with_model :MultisearchableModel do
	table do \|t\|
	t.string :title

	// non param lambda as a method
	def insert_sql
	-> (controller, action, title, url, user_id) {
	ActiveRecord::Base.connection.execute <<~SQL, [controller, action, title, url, user_id]
	insert into dummy(controller, action, title, url, user_id, created_at, updated_at)
	values(
	$1,
	$2,
	$3,
	$4,

	ruby '2.7.1'

	gem 'rails', github: 'rails/rails'
	gem 'tzinfo-data', '>= 1.2016.7' # Don't rely on OSX/Linux timezone data

	# Action Text
	gem 'actiontext', github: 'basecamp/actiontext', ref: 'okra'
	gem 'okra', github: 'basecamp/okra'

	# Drivers