GET YOUR ASS TO 1.9!

@nicbenders @ralphbod

http://nicbenders.com/ruby-19/

GET YOUR ASS TO 1.9!

@nicbenders @ralphbod

http://nicbenders.com/ruby-19/

Ruby 1.9 has been out since 2009

(Ruby 2.0 is even out now)

Ruby 1.8 will reach EOL in June

REE has already reached EOL

0

3750

7500

11250

15000

1.8.6 1.8.7 1.9.2 1.9.3 2.0.0

The New Relic App(as of mid-2012)

5 year old codebase

70,000 "Code LOC" and 59,000 "Test LOC"

Rails 2.3.14 (started as Rails 1.2.3)

REE-1.8.7-2010.02

Putting it off

Rearchitecting the app first

Do it all in a big spike!

Have a ruby_19 branch

STUPID THINGS WE TRIED

Do EVERYTHING on master

Setup a CI job for it

Start with your smaller apps

THE BIG IDEA

Be on latest Rails 2.3 or newer

Use rbenv / rvm everywhere

You already use Bundler, right?

Decent test coverage (50% is ok)

THE FOUNDATION

Getting the test suite to run

Upgrade obsolete 3rd party libs

THE HARD PART

Every commit is run both ways

Slowly burn-down the failures

(This took us several months)

THE GRIND

platforms :ruby_19 do gem 'debugger' gem 'crypt19'end

platforms :ruby_18 do gem 'ruby-debug' gem 'utility_belt' gem 'fastercsv' gem 'crypt', '1.1.4', :require => nilend

# Rails 2.3 did not get along with Ruby 1.9.3 until we did this# See - http://bit.ly/WPAj7aif ::RUBY_VERSION.split('.')[0,3] == ['1','9','3'] MissingSourceFile::REGEXPS.push( [/^cannot load such file -- (.+)$/i, 1] )end

# Prevent accidentally calling #[] on a number[Fixnum, Bignum].each do |k| k.class_eval do def [](*args) raise NoMethodError, "Calling #[] on numbers is wrong." end endend

# Use to_sym to ensure that you always have a# symbol in 1.8 or 1.9instance_methods.map(&:to_sym).include?(:connection)

require "csv"

# In Ruby 1.8, the library is called FasterCSV,# in 1.9 it's just CSV. So use some constant tricks# to make sure it's always "CSV" for usif CSV.const_defined? :Reader # Ruby 1.8 compatible require 'fastercsv' Object.send(:remove_const, :CSV) CSV = FasterCSVelse # CSV is now FasterCSV in ruby 1.9end

--- a/script/server+++ b/script/server@@ -1,3 +1,3 @@ #!/usr/bin/env ruby-require File.dirname(__FILE__) + '/../config/boot'+require File.expand_path('../../config/boot', __FILE__) require 'commands/server'

Mongrel

Ordered Hashes

Regex changes

Encodings

Enumerable String

Lambda Arity

Local dev environment first

Then each "Staging" env

Practice the roll-back plan

STARTING THE DEPLOY

Roll out servers one-by-one

Have extra capacity available

Be patient!

THE BIG DAY

Rotate the knowledge

Make it easy to test both locally

Background jobs were un-tested

THINGS TO DO BETTER

Changing the wheels on the bus at 80 mph: upgrading to Rails 3 on an active master branch

Andrew Bloomgarden and Julian Giuca

JOIN THE TEAMnewrelic.com/about/jobs