Recruiting Solutions professional hacking JRuby at LinkedIn Baq Haidri | @baqhaidri Wednesday, August 3rd 2011 in three acts
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Recruiting Solutions professional hacking
JRuby at LinkedIn
Baq Haidri | @baqhaidriWednesday, August 3rd 2011
in three acts
professional hacking
Me
• Generalist• Background in Java, not Ruby
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• Over one user added per second• Mostly Java• Strong product focus
professional hacking
2 4 8
17
32
55
90
2004 2005 2006 2007 2008 2009 2010
LinkedIn Members (Millions)
100M+ LinkedIn
professional hacking
Act I: The Data
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professional hacking 5source: Mathieu Bas/an using Gephi on LinkedIn skill data
professional hacking 6source: Mathieu Bas/an using Gephi on LinkedIn skill data
professional hacking 7
Rails Prototype
professional hacking
Act II: The Challenge
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oldemort
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Service Call
Unified URL genera5on
Interna5onaliza5onQui a consulté votre profil?
Security, Auth, Iden5tyNaviga5on Bar
professional hacking
Tomcat
Request
LinkedIn Spring MVC
JRuby-‐Rack
SiteMesh
Sinatraget ‘/hello’ do
erb :layoutend
<html> <head>
<title>Hi</title></head><body>
Hello from JRuby!</body>
</html> Response
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Hello from JRuby!
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Service Calls
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Pre-existing library for parallel, de-duplicating async data operations, loosely based on REST
Clunky abstractions in Java, but wrapped by Ruby:
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Ruby’s simplicity
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Some Ruby wrappers were created to mimic Java APIs but Ruby made them more expressive:
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Act III: To Production
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huh?
#winning!
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Deployment
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source: LinkedIn internal performance graph
Ops knows nothing‣ Configuration‣ Deployment‣Monitoring
Standard monitoring already available via JMX:‣ Latency‣ Requests/Second‣Memory and CPU usage
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Gotchas
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source: LinkedIn internal performance graph
Unpack wars on deployment Watch out for PermGen usage:
Leak! Restart
Fixed
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Flags
JVM:‣ -XX:PermSize=256m‣ -XX:MaxPermSize=256m‣ -XX:+CMSClassUnloadingEnabled
JRuby:‣None, but still use 1.8.7‣ JRuby 1.6.2
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Performance
Internal latency is averaging 700ms
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Time spent in Ruby<= ~50 ms
source: LinkedIn internal performance graph
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Conclusion
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Happily Ever After
Adoption of JRuby is growing internally Open-minded, polyglot culture
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JRubyConf Swag Contest
Visit linkedin.com/skills/skill/JRuby Tweet-share the page Be sure to include link back to JRuby Skills page,
with the #in tag and a #jrubyconf tag. First 40 users to tweet will win a prize Winners announced at lunch tomorrow
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Questions?
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