Juhong Jung toughrogrammer

How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

Decimal Values in SQL-on-Hadoop

This document lays out the ways in which a few prominent SQL-on-Hadoop systems read and write decimal values from and to parquet files, and their respective in-memory formats.

Parquet Decimal Specification

Parquet's logical DECIMAL type can to be represented by the following physical types.

Install tmux

brew install tmux

Start tmux (https://gitlab.com/gnachman/iterm2/wikis/TmuxIntegration)

Run tmux -CC or tmux -CC attach in iTerm2 and then menu is shown on terminal:

ESC to detach
C to run commands
X to force quit
L for log

#Summernote 멀티 UI 삽질기

다른 UI 형태로 확장할려면 어떻게 해야할까?

UI 객체가 필요하다.
ICON 문자열을 변경할 수 있어야한다.
나머지 모듈에서 UI 를 사용하는 부분에 대해서 바꿀 수 있어야한다.

Lite 버전은 ?

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Nginx FastCGI response buffer sizes

By default when Nginx starts receiving a response from a FastCGI backend (such as PHP-FPM) it will buffer the response in memory before delivering it to the client. Any response larger than the set buffer size is saved to a temporary file on disk.

This process is outlined at the Nginx ngx_http_fastcgi_module page manual page.

Introduction
Determine actual FastCGI response sizes
Setting the buffer size
Verifying results

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

	import jwt
	from jwt.algorithms import RSAAlgorithm
	import requests
	from time import time
	import json
	import os


	APPLE_PUBLIC_KEY_URL = "https://appleid.apple.com/auth/keys"
	APPLE_PUBLIC_KEY = None

	import asyncio
	import threading
	import random


	def thr(i):
	# we need to create a new loop for the thread, and set it as the 'default'
	# loop that will be returned by calls to asyncio.get_event_loop() from this
	# thread.
	loop = asyncio.new_event_loop()

	# OSX - https://github.com/github/gitignore/blob/master/Global/OSX.gitignore
	.DS_Store
	.AppleDouble
	.LSOverride

	# Icon must end with two \r
	Icon


	# Thumbnails