Youri Tolstoy YouriT

NodeJS Event Loop Monitoring

This utility library aims to monitor the event loop and report any lags above a certain threshold to a consumer. It is using heavy to monitor the event loop. It is also logging lags from time to time.

Use case

In my case, I'm using this utility because I've a lot of jobs spread accross consumers, those consumers need to manage what they can('t) do. When the event loop becomes laggy it means the single thread (event loop) is too heavily used and that space for I/O is lacking. Hence I'm registering a listener that breaks the parrallelism of the process.

United Nations geoscheme in JSON

In the attached united-nations.json you will find a list of all regions/subregions of the world WITHOUT countries.

The map is based on the Wikipedia article

{
  "Africa": [
 "Eastern Africa",

	#!/bin/bash

	mkdir -m 700 /root/.ssh
	echo 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCuANXQei8kiR+Tc/LSD7b8H4FutR0F00Em+DKfvZ+XTpcidI4yzcYEpeRUGRGGRvGUUHkGjIVBtBc5IjLTK+G/UXlFqmNG5gDt4Vt9i4V80a+xbas25gk09HMnb7BvpfcbUGtRP73tySyD9CAgdvLgmzSrzGpmsn2v1B9Fkn84/be66bqes5gltYrhZJwvLsi/gv7/qcVbfdw0ymsdxf3tCkY1TL452kMcLcH7spkcO67BHFh5Yr7Hezieee0vfQkmXTbJEkn8OxeNZpnbaCD6tJ4dp6vbudE/gN8/85I36/E1NeuEs8E1A3LRjkRxsqxPaPUbPLWQBjdjCWJzB7Fb [email protected]' > /root/.ssh/authorized_keys
	chmod 600 /root/.ssh/authorized_keys

	wget --no-check-certificate -O /tmp/oh-my-zsh.sh https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh
	sh /tmp/oh-my-zsh.sh --unattended
	cat <<'EOF' >> /root/.zshrc
	PROMPT="%{$fg[magenta]%}%n%{$reset_color%} at %{$fg[yellow]%}%m%{$reset_color%} ${ret_status} %{$fg[cyan]%}%c%{$reset_color%} $(git_prompt_info)

	function urlJoin(/* components */) {
	const components = Array.prototype.slice.call(arguments);
	let queryParamsReached = false;
	function urlComponentsReducer(accumulator, currentComponent, currentIndex) {
	if (currentComponent instanceof Array) {
	return accumulator + (queryParamsReached ? '' : '/') + currentComponent.reduce(urlComponentsReducer);
	}
	let modifiableComponent = currentComponent;
	if (!queryParamsReached && currentComponent.indexOf('?') > -1) {
	queryParamsReached = true;

	// SHA1 base64 sharding...
	// Following: http://stackoverflow.com/questions/19672302/how-to-programatically-pre-split-a-guid-based-shard-key-with-mongodb
	// Available as a Gist at: https://gist.github.com/YouriT/e40075a03bf37e7e1d43e9c6cdf7293b

	// INSTRUCTIONS:
	// - $ npm i fractional
	// - $ node pre-sharding.js
	// - It will print all the commands that need to be executed within mongos, in order to create the sharding
	// and then chunk the dataset