JRuby at Square

Thursday, January 26, 2012

JRuby at Square A report Steve Conover Xavier ShayThursday, January 26, 2012

ContextThursday, January 26, 2012

RailsThursday, January 26, 2012

Rails Rack Java Sinatra Java Rails RubyThursday, January 26, 2012

Java Deployment Rails DevelopmentThursday, January 26, 2012

Java IntegrationThursday, January 26, 2012

Not as immediately useful as we thought it would be.Thursday, January 26, 2012

Integrated with Neo4J libraries.Thursday, January 26, 2012

Shared JVM experience is a win.Thursday, January 26, 2012

Deployment “What do you want our infrastructure to look like in 2 years?” — MatthewThursday, January 26, 2012

“Warbler provides a minimal, ﬂexible, Ruby-like way to bundle up all of your application ﬁles for deployment to a Java environment.”Thursday, January 26, 2012

“Trinidad allows you to run a rails or rackup applications within an embedded Apache Tomcat container.”Thursday, January 26, 2012

“Kirk is a wrapper around Jetty that hides all of the insanity and wraps your Rack application in a loving embrace.”Thursday, January 26, 2012

“Also, Kirk is probably the least HTTP retarded ruby rack server out there.”Thursday, January 26, 2012

“Also, Kirk is probably the least RECT rack I OR HTTP retarded ruby NCout there.” serverThursday, January 26, 2012

“Mizuno is a set of Jetty- powered running shoes for JRuby/Rack.”Thursday, January 26, 2012

None of these ﬁt very well.Thursday, January 26, 2012

“Jetpack uses standard ruby- world tools to prepare the app for deployment, and then presents the ruby app to jetty as a Java EE web application.”Thursday, January 26, 2012

Jetpack is stylistically similar to alternatives.Thursday, January 26, 2012

“…its just that this style works and many of the others lead to failure.” — SteveThursday, January 26, 2012

http://github.com/square/jetpackThursday, January 26, 2012

Rolling deploy to n servers coordinated with haproxy.Thursday, January 26, 2012

One process with real threads rocks.Thursday, January 26, 2012

RailsThursday, January 26, 2012

“girl_friday is a Ruby library for performing asynchronous tasks.”Thursday, January 26, 2012

Thread-safe mode is not widely used.Thursday, January 26, 2012

Thread-safe mode is not widely tested.Thursday, January 26, 2012

We learned through high concurrency load testing that Arel had a non-threadsafe design.Thursday, January 26, 2012

cant add a new key into hash during iteration /rails-77dcf76f142b/activesupport/lib/active_support/ dependencies.rb:528:in `[]= https://github.com/rails/rails/issues/3817Thursday, January 26, 2012

DevelopmentThursday, January 26, 2012

> rvm use jruby > time ruby -e ruby -e 1.07s user 0.28s system 95% cpu 1.412 total > rvm use 1.9.3 > time ruby -e ruby -e 0.01s user 0.00s system 63% cpu 0.027 totalThursday, January 26, 2012

#!/bin/bash # script/ci source "$HOME/.rvm/scripts/rvm" function install_ruby_if_needed() { if ! rvm list rubies | grep $1 > /dev/null; then rvm install $1 fi } function switch_ruby() { install_ruby_if_needed $1 && rvm use $1 } function prepare_and_run() { switch_ruby $1 && install_bundler_if_needed && update_gems_if_needed && run_tests } prepare_and_run "1.9.3-p0" && prepare_and_run "jruby-1.6.5"Thursday, January 26, 2012

# Gemfile platforms :ruby do gem mysql2 end platforms :jruby do gem jdbc-mysql gem "jruby-openssl", "~> 0.7" endThursday, January 26, 2012

def normalize_sql_result(result) if jruby? result.map(&:values) else result end endThursday, January 26, 2012

result = if jruby? IO.popen4(cmd) {|_, _, _, _| } $? else pid = Process.spawn(cmd, STDERR => /dev/null) Process.waitpid2(pid)[1] endThursday, January 26, 2012

The cost of cross-ruby compatibility is low.Thursday, January 26, 2012

We have apps in both 1.8 and 1.9.Thursday, January 26, 2012

Java Deployment Rails DevelopmentThursday, January 26, 2012

Final Thoughts “What’s the word for ‘you should probably use it, unless you have a good reason not to?’” — SteveThursday, January 26, 2012

Final Thoughts @sconover @xshayThursday, January 26, 2012

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JRuby at Square

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