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Migrate to JRuby What We Learned
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ian yang @doitian
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Agenda • Background • How to Migrate • What We Learned
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Background
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Breadcrumb Payments
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The Codebase • 4 Ruby on Rails applications • Ruby 1.9.2 and Rails 3.2.1
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Why JRuby? • Multithreading • Memory Leak • Easy integration of libraries on JVM
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How to Migrate
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Choose a Deploy Strategy
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Warbler Trinidad TorqueBox Archive File ✔ ✔ ✔ Capistrano ✔ ✔ Scheduler ✔ ✔ Background Jobs ✔ ✔ Clustering ✔
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Warbler Trinidad TorqueBox Archive File ✔ ✔ ✔ Capistrano ✔ ✔ Scheduler ✔ ✔ Background Jobs ✔ ✔ Clustering ✔
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JRuby-Lint https://github.com/jruby/jruby-lint
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What We Learned
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Gems Alternatives
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Wiki: C Extension Alternatives https://github.com/jruby/jruby/wiki/C-Extension- Alternatives
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Lock Compatible Version
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gem 'rubyzip', '<1.0.0'
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*nix to JVM
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• No Kernel#fork • Cannot trap all signals
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Kernel#fork → Thread.new
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Thread-safety
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Avoid Sharing Mutable State Between Threads
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Global Variable ⾠ Class Variable ⾠ Class Instance Variable ⾠
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Lazy Initialization → Preload
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class Cvv def self.redis @@redis ||= Redis.new(...) end end ✘
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class Cvv def self.redis @@redis end def self.redis=(r) @@redis = r end end ! # config/initializers/cvv.rb Cvv.redis = Redis.new(...) ✔
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Thread Local Storage
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class Processor class_attribute :skip ! def execute do_something unless self.class.skip end end ✘
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class Processor def self.skip Thread.current['Processor.skip'] end def self.skip=(s) Thread.current['Processor.skip'] = s end end ✔
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Atomic Variable
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class Airlock class_variable :enabled end ✘
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# gem 'atomic'! class Airlock! @@enabled = Atomic.new(false)! def self.enabled! @@enabled.value! end! def self.enabled=(e)! @@enabled.update { e }! end! end ✔
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Locks require 'thread'! mutex = Mutex.new! ! Thread.new do! mutex.synchronize do! ...! end! end
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Reference: Concurrency in JRuby https://github.com/jruby/jruby/wiki/Concurrency-in- jruby
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Reference: Ruby Mutithreading http://www.tutorialspoint.com/ruby/ ruby_multithreading.htm
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Resque
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• No Fork • Jobs run in the same process • Free the resources
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OpenSSL
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Full OpenSSL Support gem 'jruby-openssl'
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Different Cryptography Implementations https://github.com/jruby/jruby/issues/931
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Cryptography Adapter • Use OpenSSL in CRuby • Use JCE directly in JRuby (java_import)
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Tuning
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TorqueBox + JBoss
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Connection Pool Size
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Thread Pool Size
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JVM Memory
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How To? • Benchmark • Monitoring
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References
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Deploying with JRuby
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JRuby Wiki https://github.com/jruby/jruby/wiki
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