Ricardo Eihara rhiroyuki

## redis_stream.md

      
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                rhiroyuki
                / redis_stream.md
            
            
              Created
              November 28, 2018 13:15
            
              
                Redis Stream
              
          
    Memory usage and saving loading times

Because of the design used to model Redis streams, the memory usage is remarkably low. It depends on the number of fields, values, and their lengths, but for simple messages we are at a few millions of messages for every 100 MB of used memory. Moreover, the format is conceived to need very minimal serialization: the listpack blocks that are stored as radix tree nodes, have the same representation on disk and in memory, so they are trivially stored and read. For instance Redis can read 5 million entries from the RDB file in 0.3 seconds.
This makes replication and persistence of streams very efficient.
It is planned to also allow deletion of items in the middle. This is only partially implemented, but the strategy is to mark entries as deleted in the entry flag, and when a given ratio between entries and deleted entires is reached, the block is rewritten to collect the garbage, and if needed it is glued to another adjacent block in o

  
## pos-clouding.txt
elb
sticky session, connection draining, proxy protocol


## sinatra-dummy-http.rb
# frozen_string_literal: true
#
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('Gemfile', __dir__)

require 'sinatra'
require 'sinatra/contrib'
require 'logger'

set :logger, Logger.new(STDOUT)

## postgres_setup.md

      
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                rhiroyuki
                / postgres_setup.md
            
            
              Last active
              March 13, 2019 18:52
            
              
                rails db:create error: FATAL: role does not exist
              
          
    Error

FATAL:  role "ricardo" does not exist
Couldn't create 'somedb_development' database. Please check your configuration.
rails aborted!
ActiveRecord::NoDatabaseError: FATAL:  role "ricardo" does not exist
bin/rails:4:in `<main>'

Caused by:
PG::ConnectionBad: FATAL:  role "ricardo" does not exist

  
## gist:c367aac1a65cb5cd2f65c3e380d4d2e1

      
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                rhiroyuki
                / gist:c367aac1a65cb5cd2f65c3e380d4d2e1
            
            
              Created
              January 3, 2019 19:16
            
              
                sinatra/padrino/not rails application rspec not loading support files
              
          
    Add this in spec_helper.rb
Dir[File.expand_path(File.join(File.dirname(__FILE__), 'support', '**', '*.rb'))].each { |f| require f }

  
## Vagrantfile
# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|
  config.vm.box = "jacksonpires/ubuntu-rails-dev"
  config.vm.box_version = "1.0.0"

  config.vm.network :forwarded_port, guest: 3000, host: 3000    # rails
  config.vm.network :forwarded_port, guest: 9292, host: 9292    # rack
  config.vm.network :forwarded_port, guest: 4567, host: 4567    # sinatra

## speed-loop.rb
def main
  CYCLES_COUNT = 1_000_000_000

  start = Time.now

  CYCLES_COUNT.times do

  end

  end_time = Time.now

## sidekiq.rb
# Getting all jobs in retry
retries = Sidekiq::RetrySet.new
retries.each do |job|
  p [job.klass, job.args, job.jid, job['created_at'], job['failed_at']]
end

# job['created_at'] and job['failed_at'] return epoch time, to parse it use Time.at(job['created_at'].to_f)

## gist:0fedf706ba2952ad6b799b4b2ed1023d

      
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                rhiroyuki
                / gist:0fedf706ba2952ad6b799b4b2ed1023d
            
            
              Last active
              March 10, 2019 21:23
            
              
                gpg, keyserver and etc
              
          
    For some reason the current keyserver that is by default set on Manjaro /etc/pacman.d/gnupg/gpg.conf doesn't work for me.
To fix that I have to edit the keyserver for another https://wiki.archlinux.org/index.php/Pacman/Package_signing
Or manually get the signature using the following command:
gpg --keyserver hkp://ipv4.pool.sks-keyservers.net:11371 --recv-keys {keys}

  
## commands.sh
#! /bin/bash

main () {
  sudo pacman -Syu --noconfirm
  sudo pacman -S tmux \
    zsh \
    neovim \
    fzf \
    fd \
    jq \
	# frozen_string_literal: true
	#
	ENV['BUNDLE_GEMFILE'] \|\|= File.expand_path('Gemfile', __dir__)

	require 'sinatra'
	require 'sinatra/contrib'
	require 'logger'

	set :logger, Logger.new(STDOUT)
	# -- mode: ruby --
	# vi: set ft=ruby :

	Vagrant.configure("2") do \|config\|
	config.vm.box = "jacksonpires/ubuntu-rails-dev"
	config.vm.box_version = "1.0.0"

	config.vm.network :forwarded_port, guest: 3000, host: 3000 # rails
	config.vm.network :forwarded_port, guest: 9292, host: 9292 # rack
	config.vm.network :forwarded_port, guest: 4567, host: 4567 # sinatra
	def main
	CYCLES_COUNT = 1_000_000_000

	start = Time.now

	CYCLES_COUNT.times do

	end

	end_time = Time.now
	# Getting all jobs in retry
	retries = Sidekiq::RetrySet.new
	retries.each do \|job\|
	p [job.klass, job.args, job.jid, job['created_at'], job['failed_at']]
	end

	# job['created_at'] and job['failed_at'] return epoch time, to parse it use Time.at(job['created_at'].to_f)
	#! /bin/bash

	main () {
	sudo pacman -Syu --noconfirm
	sudo pacman -S tmux \
	zsh \
	neovim \
	fzf \
	fd \
	jq \