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Migrate to

JRuby

What We Learned
ian yang
@doitian
Agenda

• Background	

• How to Migrate	

• What We Learned
Background
Breadcrumb Payments
The Codebase

• 4 Ruby on Rails applications	

• Ruby 1.9.2 and Rails 3.2.1
Why JRuby?

• Multithreading	

• Memory Leak	

• Easy integration of libraries on
JVM
How to Migrate
Choose a Deploy
Strategy
Archive File
Capistrano
Scheduler
Background Jobs
Clustering

Warbler
✔

Trinidad
✔
✔
✔
✔

TorqueBox
✔
✔
✔
✔
✔
Archive File
Capistrano
Scheduler
Background Jobs
Clustering

Warbler
✔

Trinidad
✔
✔
✔
✔

TorqueBox
✔
✔
✔
✔
✔
JRuby-Lint
https://github.com/jruby/jruby-lint
What We Learned
Gems Alternatives
Wiki: C Extension
Alternatives
https://github.com/jruby/jruby/wiki/C-ExtensionAlternatives
Lock Compatible
Version
gem 'rubyzip', '<1.0.0'
*nix to JVM
•
Cannot trap all signals
•
No Kernel#fork
Kernel#fork → Thread.new
Thread-safety
Avoid Sharing Mutable
State Between Threads
Global Variable
Class Variable
Class Instance Variable
Lazy Initialization →
Preload
class Cvv
✘
def self.redis
@@redis ||= Redis.new(...)
end
end
class Cvv
def self.redis
@@redis
end
def self.redis=(r)
@@redis = r
end
end

✔

!

# config/initializers/cvv.rb
Cvv.redis = Redis.new(...)
Thread Local Storage
class Processor
class_attribute :skip

✘

!

def execute
do_something unless self.class.skip
end
end
✔

class Processor
def self.skip
Thread.current['Processor.skip']
end
def self.skip=(s)
Thread.current['Processor.skip'] = s
end
end
Atomic Variable
class Airlock
class_variable :enabled
end

✘
# gem 'atomic'!
✔
class Airlock!
@@enabled = Atomic.new(false)!
def self.enabled!
@@enabled.value!
end!
def self.enabled=(e)!
@@enabled.update { e }!
end!
end
Locks
require 'thread'!
mutex = Mutex.new!
!

Thread.new do!
mutex.synchronize do!
...!
end!
end
Reference:
Concurrency in JRuby
https://github.com/jruby/jruby/wiki/Concurrency-injruby
Reference: Ruby
Mutithreading
http://www.tutorialspoint.com/ruby/
ruby_multithreading.htm
Resque
•
Jobs run in the same process	

•
Free the resources
•
No Fork
OpenSSL
Full OpenSSL Support
gem 'jruby-openssl'
Different Cryptography
Implementations
https://github.com/jruby/jruby/issues/931
Cryptography Adapter

• Use OpenSSL in CRuby	

• Use JCE directly in JRuby
(java_import)
Tuning
TorqueBox + JBoss
Connection Pool Size
Thread Pool Size
JVM Memory
How To?

• Benchmark	

• Monitoring
References
Deploying with
JRuby
JRuby Wiki
https://github.com/jruby/jruby/wiki
Migrate to JRuby - What We Learned Migrating Ruby on Rails Apps

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