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Chapter 1: Reliable, Scalable, and Maintainable Applications

Data Systems
- Dimensions to consider when thinking about data systems: access patterns, performance characteristics, implementations.
- Modern data systems often blur the lines between databases, caches, streams, etc.
Reliability
- Systems should perform the expected function at a given level of performance, and be tolerant to faults and user mistakes
- Fault: One component of a system deviating from its spec. Prefer tolerating faults over preventing them (except for things like security issues). Faults stem from hardware failures, software failures, and human error (in a study, config errors caused most outages).
- Failure: The system as a whole not working
Scalability

Chrome ExtensionのLive HTTP Headersを調査した。Firefox用のものではない。Firefox用のものではない。

11/7追記

Summary in english.

	pmset -g log \| grep ShutdownCause

	ShutdownCause SMC shutdown cause: -82:

	# https://github.com/apple-oss-distributions/PowerManagement/
	# https://georgegarside.com/blog/macos/shutdown-causes/

	"Thermal shutdown for overtemp", -81
	"Proximity temperature exceeds limits" -86

	__SSTOKENSTRING = "@generated SignedSource<<dbe928e1275c495c1922c1bf063ffb70>>";
	! function(e) {
	function t(e) {
	function t() {
	var t = Array.prototype.map.call(arguments, function(e) {
	if (null == e) return null === e ? "null" : "undefined";
	if ("string" == typeof e) return '"' + e + '"';
	try {
	return JSON.stringify(e)
	} catch (t) {

	For iOS.
	(Do not delete the app, this obviously loses your data!)

	1. Disable the setting in iCloud for WhatsApp (aka delete the current backup)
	2. Key: wait for an Apple iOS update and update the phone
	3. Backup now should work again.

	Extra: The backup is (has been) most likely working and WhatsApp iOS isn't syncing properly.
	Check whether the WhatsApp backup size in iCloud and in the WhatsApp application
	are the same.

	#!/usr/bin/env python3

	import requests
	import sys
	from bs4 import BeautifulSoup
	from urllib.parse import urljoin
	import random
	import logging
	import time

	unplug your oculus go it doesn’t have any juice then hold the power button (while disconnected) for 11 to 12 seconds after that, just plug your headset back and the charging status screen should appear.

	https://www.reddit.com/r/OculusGo/comments/ack5ob/my_oculus_go_wont_turn_on_despite_charging/