The document discusses migrating from a legacy Ruby on Rails application to a newer version of Rails. It provides examples of performance improvements when upgrading Ruby from 1.8.6 to 2.1.1 and Rails from 2.0 to 4.1. It also discusses strategies for migrating codebases while maintaining zero downtime deployments.

1. !
From ‘Legacy' to ‘Edge'
2014 edition
!
Hiroshi SHIBATA
@hsbt
RubyConfTaiwan 2014

2. Thank you!

3. SHIBATA Hiroshi(@hsbt)

4. Ruby Committer

5. ruby-lang.org

6. Rails Girls in Japan

7. asakusa.rb

9. ミドルウェアのアップグレード
アクセス解析基盤の構築
セキュリティ監査
Ruby/Rails
技術リ基ーンス盤タートチアップ
ーム
社内開発基盤の構築
JSOXの運用整備
統計基盤の構築
github
テスト基盤の構築コードレビュー
新人教育
開発プロセス
原稿執筆
カンファレンス発表
Jenkins
RDBMS
OSS開発サーバー構成管理の刷新

10. http://30d.jp

11. from 2008/4

12. 380,000 users
230,000,000 photos

13. Our Rails app
46 models
5000 lines in controllers
400 lines in routes.rb
1:1.3 code to test ratio

14. system architecture

15. application server

16. storage server

17. job server

18. transaction server

19. storage is over
450 TB

20. database size
is over
250 GB

21. Development
Culture

22. github workflow

23. IRC
github issue
costomer’s
contact
nagios

24. DevOps

25. 4 deploy/day

27. How to migrate
edge rails
from
legacy rails?

28. Ruby 1.8.6
Rails 2.0.2

29. Ruby 1.8.6
Rails 2.0.2
Ruby 2.1.1
Rails 4.1.0 new!

30. Why?

32. Ruby on Rails

33. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
4.0

34. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
Slow
4.0 Fast

35. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
4.0

36. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
4.0

37. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
4.0

38. Rails 2.0
Rails 2.3

39. Rails 2.0
hotfix A
Rails 2.3
migration A

40. Rails 2.0
hotfix A
Rails 2.3
migration A

41. Rails 2.0
hotfix A
Rails 2.3
migration A

43. Zero
Downtime
Deploy

44. cookpad/kage

45. Kage (kah-geh) is an HTTP shadow
proxy server that sits between
clients and your server(s) to
enable "shadow requests".

46. the basic of kage
real request

48. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
4.0

49. rails 2.3 with bundler

50. source 'https://rubygems.org'!
!
gem 'rails', '~> 2.3.18'!
gem 'rake', '~> 0.9.2'!
gem 'rdoc'!
gem 'rake-confirm'!
!
gem 'mysql'!
gem "mysql_retry_lost_connection"!
gem 'acts_as_paranoid', :github => 'paperboy-30days/acts_as_paranoid'!
gem 'passenger', '~> 3.0'!
gem 'memcache-client', :require => 'memcache'!
gem 'system_timer'!
gem 'yajl-ruby', :require => 'yajl'!
gem 'will_paginate', '~> 2.3'!
gem 'mail'!
!
gem 'sass'!
gem 'compass-rails'!
!
gem 'osaipo_client', :git => 'git@github.com:paperboy-all/
osaipo_client.git', :branch => 'legacy'!
gem 'jugem_client', :git => 'git@github.com:paperboy-all/
jugem_client.git'!
gem 'ppb_footer', :github => 'paperboy-all/ppb_footer'!

51. require "./config/environment"!
!
use Rails::Rack::LogTailer!
use Rails::Rack::Static!
run ActionController::Dispatcher.new
rack with rails 2.3

52. can’t use
hyphen
30days-front
can’t use
number
can’t convert
! application.rb...

53. Reduce
customer frustration.

54. app1
app2
backgroundrb to dj

56. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
4.0

57. Use trunk everyday.

60. 1.8 to 2.0

62. 2.0 to 2.1

63. CPU Usage(%)
100
75
50
25
0
49
2.0 2.1
69

64. Resp. time(ms)
250
200
150
100
50
0
189
2.0 2.1
221

65. 4
3
memory usage(giga byte) 0
2
1
3.8
2.0 2.1
3.2

66. https://www.ruby-lang.org/en/news/2014/03/10/regression-of-hash-reject-in-ruby-2-1-1/

67. Ruby
1.8.6 1.8.7 1.9.3 2.0.0 2.1
Rails
2.0/2.1
2.3
3.0
3.2
4.0

69. Use modern architecture

70. app1
app2

71. kyoto tycoon is slower
than mysql…

73. Resp. time(ms)
300
240
180
120
60
0
287
3.2 4.0
189

74. Ruby
1.9.3 2.0.0 2.1 2.2
Rails
3.0
3.2 ?
4.0 ?
4.1 ?

75. Ruby
1.9.3 2.0.0 2.1 2.2
Rails
3.0
3.2 ?
4.0 ?
New!!
4.1 ?

77. 1. Flash structure changes
2. Mutator methods called on Relation

79. Resp. time(ms)
300
240
180
120
60
0
266
4.0 4.1
287

80. Ruby
1.9.3 2.0.0 2.1 2.2
Rails
3.0
3.2 ?
4.0 ?
4.1 ?

81. class Bar!
def bar(foo = foo())!
foo!
end!
!
def buzz(foo = foo)!
foo!
end!
!
def foo!
:buzz!
end!
end!
!
p Bar.new.bar!
p Bar.new.buzz

82. % ruby -v r45272.rb!
ruby 2.2.0dev (2014-04-13 trunk 45580) [x86_64-darwin13]!
:buzz!
nil!
!
% ruby -v r45272.rb!
ruby 2.1.2p80 (2014-03-01 revision 45231) [x86_64-darwin13.0]!
:buzz!
:buzz

84. conclusion

85. 1. fix your code
2. fix gem
3. fix Rails
4. fix Ruby