William Li senvey

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?

Site List

Image Site

Default

Powerlevel10k

Setup Mac OS X

I've done the same process every couple years since 2013 (Mountain Lion, Mavericks, High Sierra, Catalina) and I updated the Gist each time I've done it.

I kinda regret for not using something like Boxen (or anything similar) to automate the process, but TBH I only actually needed to these steps once every couple years...

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	# Change the magic key to `^A`:
	set-option -g prefix C-a
	unbind-key C-b
	bind-key a send-prefix

	### Some familiar `screen`-like movement bindings ###
	# `^A^A` to toggle between the last two windows
	bind-key C-a last-window
	# `^A space` to move to the next window
	bind-key Space next-window

	This gist covers the Oozie SSH action.
	It includes components of a sample Oozie workflow application- scripts/code,
	sample data and commands; Oozie actions covered: secure shell action, email
	action.

	My blog has documentation, and highlights of a very basic sample program.
	http://hadooped.blogspot.com/2013/10/apache-oozie-part-13-oozie-ssh-action_30.html


	This gist includes:

	from django.contrib.sessions.backends.base import SessionBase, CreateError
	from django.conf import settings
	from django.utils.encoding import force_unicode
	import redis

	class SessionStore(SessionBase):
	""" Redis store for sessions"""

	def __init__(self, session_key=None):
	self.redis = redis.Redis(

	#!/usr/bin/env python

	#
	# Converts any integer into a base [BASE] number. I have chosen 62
	# as it is meant to represent the integers using all the alphanumeric
	# characters, [no special characters] = {0..9}, {A..Z}, {a..z}
	#
	# I plan on using this to shorten the representation of possibly long ids,
	# a la url shortenters
	#