some example to get new practices

new_practice.rb

Чтобы не быть голословным:
require 'redis'
require 'connection_pool'

module Shared
  class RedisPool
    DEFAULT_POOL_SIZE = 100.freeze # Per 1 process

    # Closes all the connections and clears the pool
    #
    def shutdown
      @pool.shutdown do |connection|
        connection.quit
      end
    end

    # Gets a connection from pool and yields a given &block
    #
    # @example
    #   Shared::RedisPool.new.connect { |connection| connection.get('key') }
    #
    def connect(&block)
      @pool.with do |connection|
        yield connection
      end
    end

    # Delegates methods to a connection
    # 
    # @example
    #   Shared::RedisPool.new.set('foo', 'bar')
    #   
    def method_missing(m, *args)
      connect do |c|
        c.send(m, *args)
      end
    end

    private

    def initialize
      @pool = ConnectionPool.new(size: ENV['MAX_REDIS_CONNECTIONS'].to_i | DEFAULT_POOL_SIZE, timeout: 5) do
        ENV['REDIS_URL'] ? ::Redis.new(url: ENV['REDIS_URL']) : ::Redis.new
      end
    end
  end
end