JRuby in 2017 and beyond
Challenges,
Bugs, Hopes and Dreams
who am i
IVO anjo
Ruby ❤
CONCURRENCY ❤
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JRuby ❤
Blog about Ruby && JRuby stuff https://ivoanjo.me @knux
SO... JRUBY?
ruby on top of the java vm
SO... JRUBY?
WHy #1: PERFORMANCE
JIT COMPILER
STATE-of-THE-ART GC
SO... JRUBY?
WHy #2: PRODUCTION-READY
Text
SO... JRUBY?
WHy #3: MASSIVELY PARALLEL
UNLEASH THE THREADS
...AND THE ASYNC WORK
SO... JRUBY?
WHy #4: TROUBLESHOOTING
USE AWESOME JAVA TOOLING
• PROFILERS
• MONITORING
• DEBUGGERS
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IN PRODUCTION!
SO... JRUBY?
WHy #5: EASY TO DEPLOY
RUBY TOOLING OR JAVA TOOLING
SO... JRUBY?
WHy #5½: EASY TO DEPLOY
DEPLOY AS RUBY SOURCES
OR SINGLE-FILE DEPLOY
SO... JRUBY?
WHy #6: ACCESS TO BOTH ECOSYSTEMS
USE RUBY/JAVA/SCALA/KOTLIN/CLOJURE/... LIBRARIES
SO... JRUBY?
WHy #6½: ACCESS TO BOTH ECOSYSTEMS
KAFKA/CASSANDRA/... DRIVERS
MAP-REDUCE
...
HOW hard is it to start using?
$ rvm install jruby-9.1.13.0
$ rvm USE jruby-9.1.13.0
$ GEM INSTALL BUNDLER
$ BUNDLE INSTALL
SPENT A FEW MINUTES PORTING TALKDESK's RAILS MONOLITH
1635 examples, 19 failures, 41 pending
SPENT A FEW MINUTES PORTING TALKDESK's RAILS MONOLITH
AUTHENTICATE, PLACE & LIST CALLS, ACCESS SETTINGS, ETC.
going cold-turkey is a big step
i still recommend you carefully validate your app :)
“thread carefully”?
MY EXPERIENCE
WITH
JRUBY
contacts importer
Contacts
API
Contacts
Importer
Salesforce
Zendesk
NSA
v0: unleash the threads
???
load up visualvm
googling around
oops, we were using the gem wrong
👍 fixed
v1: CPU-LIMITED? WAT?
THIS DOESN'T SEEM RIGHT...
👍 fix merged upstream!
v2: memory leaks :(
load up visualvm
follow the breadcrumbs
👍 fixED
👍 fixED
v2½: memory leaks :(
3 DAYS LATER! :)
contacts importer
huge productivity boost
wizard-level debugging MADE easy
hit double our performance target on a single instance
JRuby
101
in development
export JRUBY_OPTS=--dev
bundle install --binstubs
in development
gem 'pry-byebug',
platforms: :ruby
gem 'pry-debugger-jruby',
platforms: :jrubyexport JRUBY_OPTS="--dev --debug"
in development
gem 'multi_json'
gem 'oj', platforms: :ruby
gem 'jrjackson', platforms: :jruby
if RUBY_PLATFORM == 'java'
require 'jrjackson'
MultiJson.use :jr_jackson
else
require 'oj'
MultiJson.use :oj
end
in development
jruby-lint
./Gemfile:24: [gems, warning] Found gem 'oj' which is reported to have some issues: Try gson, json or json_pure instead. Try any one of the following JRuby-based servers: Trinidad, Mizuno, Kirk or Puma (though make sure to use the JRuby-native version of the gem). ./Gemfile:43: [gems, warning] Found gem 'bson_ext' which is reported to have some issues: bson_ext isn't used with JRuby. Instead, some native Java extensions are bundled with the bson gem. ./app/controllers/api/user_controller.rb:25: [nonatomic, warning] Non-local operator assignment is not guaranteed to be atomic
in development
concurrent-ruby
is your friend
in development
visualvm
in development
https://ivoanjo.me/blog/2017/08/12/ninjas-guide-to-visualvm/
google: "ninjas guide visualvm"
(including JRuby goodies!!!)
in development
netbeans profiling
in development
jmap/jstack
$ jmap -histo 17118 | grep rubyobj
17: 9000 288000 rubyobj.Example.A
337: 98 3136 rubyobj.Gem.Requirement
435: 52 1664 rubyobj.Gem.Dependency
470: 42 1344 rubyobj.OtherStuff.B
477: 41 1312 rubyobj.Gem.Version
762: 13 416 rubyobj.Gem.Specification
1103: 6 192 rubyobj.Gem.Platform
4060: 1 32 rubyobj.Gem.PathSupport
4061: 1 32 rubyobj.Gem.StubSpecification
4062: 1 32 rubyobj.Gem.StubSpecification.StubLine
4063: 1 32 rubyobj.Monitorexport JRUBY_OPTS="-Xreify.classes=true"
in development
yourkit & jprofiler
in production
export JRUBY_OPTS=\ "-Xcompile.invokedynamic=true -Xmanagement.enabled=true"
in production
MAY NEED some tuning for smaller machines :/
(e.g. Heroku 1x or 2x)
in production
THANKS!
TWITTERS: @KNUX
BLOG: ivoanjo.me
LOTS MORE JRUBY!