Aryan Ahmed thearyanahmed

There are certain files created by particular editors, IDEs, operating systems, etc., that do not belong in a repository. But adding system-specific files to the repo's .gitignore is considered a poor practice. This file should only exclude files and directories that are a part of the package that should not be versioned (such as the node_modules directory) as well as files that are generated (and regenerated) as artifacts of a build process.

All other files should be in your own global gitignore file:

Create a file called .gitignore in your home directory and add any filepath patterns you want to ignore.
Tell git where your global gitignore file is.

Note: The specific name and path you choose aren't important as long as you configure git to find it, as shown below. You could substitute .config/git/ignore for .gitignore in your home directory, if you prefer.

Nginx Cheat Sheet

(from Understanding Nginx Server and Location Block Selection Algorithms - https://goo.gl/YyzshP)

server {

Kafka Distributed Streaming Platform

Publish and Subscribe / Process / Store

Start Kafka

Kafka uses ZooKeeper as a distributed backend.

Start Zookeeper

thread	goroutine
OS threads are managed by kernal and has hardware dependencies.	goroutines are managed by go runtime and has no hardware dependencies.
OS threads generally have fixed stack size of 1-2MB	goroutines typically have 8KB (2KB since Go 1.4) of stack size in newer versions of go
Stack size is determined during compile time and can not grow	Stack size of go is managed in run-time and can grow up to 1GB which is possible by allocating and freeing heap storage
There is no easy communication medium between threads. There is huge latency between inter-thread communication.	goroutine use `channels` to communicate with other goroutines with low latency (read more).
Threads have identity. There is TID which identifies each thread in a process.	goroutine do not have any identity. go implemented this because go does not have TLS([Thread Local Storage](https://msdn.microsoft.com/en-us/library/win

	#!/bin/sh

	# Converts a mysqldump file into a Sqlite 3 compatible file. It also extracts the MySQL `KEY xxxxx` from the
	# CREATE block and create them in separate commands _after_ all the INSERTs.

	# Awk is choosen because it's fast and portable. You can use gawk, original awk or even the lightning fast mawk.
	# The mysqldump file is traversed only once.

	# Usage: $ ./mysql2sqlite mysqldump-opts db-name \| sqlite3 database.sqlite
	# Example: $ ./mysql2sqlite --no-data -u root -pMySecretPassWord myDbase \| sqlite3 database.sqlite

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	package main

	import (
	"bytes"
	"fmt"
	"io"
	"log"
	"mime/multipart"
	"net/http"
	"os"

	package main

	import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"

	/* Laravel mix API cheat sheet /
	mix.js(src, output);
	mix.react(src, output); / Identical to mix.js(), but registers React Babel compilation. /
	mix.extract(vendorLibs);
	mix.sass(src, output);
	mix.standaloneSass('src', output); / Faster, but isolated from Webpack. /
	mix.fastSass('src', output); / Alias for mix.standaloneSass(). /
	mix.less(src, output);
	mix.stylus(src, output);
	mix.postCss(src, output, [require('postcss-some-plugin')()]);

	package main

	import (
	"math"
	"fmt"
	)

	//:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
	//::: :::
	//::: This routine calculates the distance between two points (given the :::