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Continuous Deployment at Etsy: A Tale of Two Approaches

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  • Great presentation ... I was wondering if Etsy does dogfooding, and A/B Testing ... does Etsy perform any kind of packaging mechanism to deploy the executable ?
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Continuous Deployment at Etsy: A Tale of Two Approaches

  1. 1. Continuous Deployment at : A Tale of Two ApproachesRoss Snyderross@etsy.com@beamrider9 March 9, 2013 1
  2. 2. A quick primer on 2
  3. 3. is:The global marketplace we make together. 3
  4. 4. is:The premier destination for handmade goods, vintage items, and craft supplies. simplertimestoys lacklusterco norwesterseaglass 4
  5. 5. quick facts: (as of March 2013)• 22+ million members• 800,000+ active shops• 18+ million items currently for sale• 20 cents to list item, 3.5% transaction fee• 400+ employees (majority in Brooklyn) 5
  6. 6. Since opening its doors in June 2005, Etsy has grown virtually non-stop. $1,000 $800 $600 $400 $200 $0 2005 2006 2007 2008 2009 2010 2011 2012 Gross Merchandise Sales ($MM) 6
  7. 7. A nice problem to have: “Our site is sosuccessful, how can we move fast enough tokeep up with demand?” 7
  8. 8. CONTINUOUSDEPLOYMENT 8
  9. 9. :The Early Years (2005 - 2008) 9
  10. 10. : The Early Years1. Spend significant time writing code 10
  11. 11. : The Early Years1. Weeks writing code 2. Painful source control merge 11
  12. 12. : The Early Years1. Weeks writing code2. Painful merge 3. Hand off to someone else to deploy 12
  13. 13. : The Early Years1. Weeks writing code2. Painful merge3. Hand off to deployers 4. Deploy, site goes down 13
  14. 14. : The Early Years1. Weeks writing code 4. Deploy, site down2. Painful merge3. Hand off to deployers 5. Roll back deploy 14
  15. 15. : The Early Years1. Weeks writing code 4. Deploy, site down2. Painful merge 5. Roll back deploy3. Hand off to deployers 6. Spend hours (days?) fixing bugs 15
  16. 16. : The Early Years1. Weeks writing code 4. Deploy, site down2. Painful merge 5. Roll back deploy3. Hand off to deployers 6. Fix bugs 7. Go back to step 2 16
  17. 17. : The Early Years WATERFALL! 17
  18. 18. : The Early YearsPros:Early Etsy engineersused this releasecycle to bootstrapthe marketplacefrom nothing.Forever grateful. 18
  19. 19. : The Early YearsCons:• Large changesets• Infrequent deploys• Weak confidence in deploy success• Significant time spent deploying• Low ability to experiment/iterate/react• Developer stress/unhappiness 19
  20. 20. : The Early Years By late 2008, Etsy is still a startup, but hasthe deploy process of a much bulkier company.Popularity is on the verge of outpacing capacity. 20
  21. 21. :Today 21
  22. 22. : Today1. Small changesets, deployed frequently 22
  23. 23. : Today1. Small changesets 2. Engineers deploy the site 23
  24. 24. : TodayAnd not just engineers, but also:• Designers• Product Folks• Upper Management• Board Members• Dogs 24
  25. 25. : Today1. Small changesets2. Engineers deploy3. Deploys are fast and near-effortless 25
  26. 26. : Today1. Small changesets2. Engineers deploy3. Deploys are fast 4. Most changes behind config flags (safer deploys) 26
  27. 27. : Today1. Small changesets 4. Changes behind flags2. Engineers deploy3. Deploys are fast 5. Graphs/metrics to assess deploy 27
  28. 28. : Today 1. Small changesets 4. Changes behind flags 2. Engineers deploy 5. Copious graphs/metrics 3. Deploys are fast6. If issues, fix immediately & roll forward 28
  29. 29. : TodayThis isn’t license to break stuff, quickly.Engineer-driven QA and solid unit testing are integral parts of the process. 29
  30. 30. : Today1. Small changesets 4. Changes behind flags2. Engineers deploy 5. Copious graphs/metrics3. Deploys are fast 6. Fix fast & roll forward7. Repeat 25+ times per day, every day 30
  31. 31. Then: 1. Weeks writing code 2. Painful merge 3. Hand off to deployers 4. Deploy, site down 5. Roll back deploy 6. Fix bugs, go to step 2Now: 1. Small changesets 2. Engineers deploy 3. Deploys are fast 4. Changes behind flags 5. Copious graphs/metrics 6. Fix fast & roll forward 31
  32. 32. Etsy Deploy Stats: 2012• Deployed to production 6,419 times• On average, 535/month, 25/day• Additional 3,851 config-only deploys• 196 different people deployed to prod• Nov/Dec 2012: deployed 752 times 32
  33. 33. Why does it work? 33
  34. 34. Continuous Deployment Math • N = # of deploys • P = probability of site degradation • S = average severity of degradation • T = time to detect/resolve Expected = N*P*S*T Downtime 34
  35. 35. Continuous Deployment MathN = # of deploys S = avg. severity of degradationP = prob. of degradation T = time to detect/resolve Before: Now: •N=1 • N = 250 ↑↑↑↑ • P = 0.5 • P = 0.1 ↓ • S = 0.7 • S = 0.05 ↓↓ • T = 100 • T = 5 ↓↓↓ E.D. = 35 E.D. = 6.25 (all numbers completely arbitrary) 35
  36. 36. Big Takeaway Etsy circa 2013 (400+ employees)acts, in some ways, more like a startup than Etsy circa 2008 (40+ employees). 36
  37. 37. Continuous Deployment makes possible: “Continuous Experimentation” http://etsy.me/continuous-experimentation 37
  38. 38. Continuous Experimentation 1. Small changes 2. Run experiment (A/B test) 3. Analyze data 4. Re-examine assumptionsRepeat continuously in pursuit of larger goals. 38
  39. 39. Heard since 2010:“Neat experiment, butthis will never scale.” As of 2013, Etsy has 100+ engineers - still going strong. 39
  40. 40. Some Etsy CustomizationsDeploying is a first-class feature. Inability todeploy is a P1 incident (same as site down). 40
  41. 41. Some Etsy CustomizationsWe continuously deploy not just the main Etsy website, but as much as possible: • Internal admin site • API • Big data • Search • Blog • Deployinator itself 41
  42. 42. Some Etsy Customizations In the rare case we can’t continuously deploy, we create alternative tools: • Database schema changes • PCI-DSS environment (credit cards) We do continuously deploy as much of ourpayment processing as is safe & legal (98%). 42
  43. 43. Some Etsy CustomizationsKeeping deploys fast is paramount and worth the investment in manpower & hardware. 43
  44. 44. Some Etsy Customizations Continuous deployment is all about movingforward, sometimes at the expense of the past.Our solution: engineering-wide bug rotation,one day a month, every engineer participates. 44
  45. 45. Fun Fact: Continuous Deployment is a fantasticrecruitment tool for attracting engineerswho like to move fast and get stuff done. 45
  46. 46. Learn more:http://codeascraft.etsy.com/Etsy open source (Deployinator, StatsD)http://etsy.github.com/Join the fun:http://www.etsy.com/careers 46

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