Pranay Kanwar r4um

Rich Already Answered That!

A list of commonly asked questions, design decisions, reasons why Clojure is the way it is as they were answered directly by Rich (even when from many years ago, those answers are pretty much valid today!). Feel free to point friends and colleagues here next time they ask (again). Answers are pasted verbatim (I've made small adjustments for readibility, but never changed a sentence) from mailing lists, articles, chats.

How to use:

The link in the table of content jumps at the copy of the answer on this page.
The link on the answer itself points back at the original post.

Table of Content

Sessions

Code	Title	Duration	Link
Keynote	Andy Jassy Keynote Announcement Recap	0:01	https://www.youtube.com/watch?v=TZCxKAM2GtQ
Keynote	AWS re:Invent 2016 Keynote: Andy Jassy	2:22	https://www.youtube.com/watch?v=8RrbUyw9uSg
Keynote	AWS re:Invent 2016 Keynote: Werner Vogels	2:16	https://www.youtube.com/watch?v=ZDScBNahsL4
Keynote	[Tuesday Night Live with Jame

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

An update by Paul Johnston ([email protected]), for a Serverless Architecture scenario. This assumes something akin to AWS Lambda + API Gateway + DynamoDB (c. 2016) Function as a Service (FaaS) solution as the basis for deployment rather than a cloud-based virtual server approach which the original paper was based upon. The FaaS solution implies each function is separately scalable and the database is inherently partitioned (assuming designed/built well).

If you agree/disagree, please fork and share with me on twitter @pauldjohnston.

Building a Maintainable, Agile Architecture for Realtime, Transactional Apps

A maintainable application architecture requires that the UI only contain the rendering logic and execute queries and mutations against the underlying data model on the server. A maintainable architecture must not contain any logic for composing "app state" on the client as that would necessarily embed business logic in the client. App state should be persisted to the database and the client projection of it should be composed in the mid tier, and refreshed as mutations occur on the server (and after network interruption) for a highly interactive, realtime UX.

With GraphQL we are able to define an easy-to-change application-level data schema on the server that captures the types and relationships in our data, and wiring it to data sources via resolvers that leverage our db's own query language (or data-oriented, uniform service APIs) to resolve client-specified "queries" and "mutations" against the schema.

We use GraphQL to dyn

System Design Cheatsheet

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

Basic Steps

Clarify and agree on the scope of the system

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?

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

	package main

	import (
	"fmt"
	"sync"
	"time"
	)

	func main() {
	wg := sync.WaitGroup{}

	#!/bin/bash
	# This Works is placed under the terms of the Copyright Less License,
	# see file COPYRIGHT.CLL. USE AT OWN RISK, ABSOLUTELY NO WARRANTY.
	#
	# COPYRIGHT.CLL can be found at http://permalink.de/tino/cll
	# (CLL is CC0 as long as not covered by any Copyright)

	OOPS() { echo "OOPS: $*" >&2; exit 23; }

	[ -z "`pidof openssl`" ] \|\| OOPS "openssl running, consider: killall openssl"

	##################
	# Privacy Settings
	##################

	# Privacy: Let apps use my advertising ID: Disable
	Set-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\AdvertisingInfo -Name Enabled -Type DWord -Value 0
	# To Restore:
	#Set-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\AdvertisingInfo -Name Enabled -Type DWord -Value 1
	# Privacy: SmartScreen Filter for Store Apps: Disable
	Set-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppHost -Name EnableWebContentEvaluation -Type DWord -Value 0