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CAN TIME-TRAVEL KEEP YOU FROM BLOWING UP THE ENTERPRISE? @DAVETRON5000

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SCALING RAILS

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SCALING RAILS ▸ Do stuff Faster? ▸ Do more stuff at once?

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SCALING RAILS ▸ Do stuff Faster? ▸ Do more stuff at once? NO, IT'S ACTUALLY… ▸ Growing Team ▸ Growing Business ▸ Changing Business

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MONOLITH? OR MICROSERVICES?

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A FRAMING DEVICE CAUSE & EFFECT

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DON'T BLOW UP THE ENTERPRISE

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DON'T BLOW UP THE ENTERPRISE

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DON'T BLOW UP THE ENTERPRISE

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DON'T BLOW UP THE ENTERPRISE

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DON'T BLOW UP THE ENTERPRISE

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FIRST, SOME ASSUMPTIONS

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FIRST, SOME ASSUMPTIONS ▸ Over time, more people will work on the code

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FIRST, SOME ASSUMPTIONS ▸ Over time, more people will work on the code ▸ Over time, different people will work on the code

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FIRST, SOME ASSUMPTIONS ▸ Over time, more people will work on the code ▸ Over time, different people will work on the code ▸ There will be increasing demands on the code

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FAILURE: BUSINESS/PRODUCT NOT MEETING USER NEEDS ▸ Simple changes difficult ▸ Difficult changes impossible ▸ Low morale ▸ Brain drain

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COMMON, BUT NOT UNIVERSAL ▸ Start-up ▸ New project on a larger company ▸ New longer-term consulting gig

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COMMON, BUT NOT UNIVERSAL ▸ Start-up ▸ New project on a larger company ▸ New longer-term consulting gig GROWTH & CHANGE

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NOTHIN' BEATS MONOLITH! GOOD 'OLE MONOLITH

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SHIP EARLY, SHIP OFTEN INTEGRATED SYSTEM

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MORE DEVELOPERS!

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MORE DEVELOPERS!

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MORE DEVELOPERS!

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MORE HIDDEN COMPLEXITY HOMEPAGE ADMIN PURCHASING SEARCH REFERRALS

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MORE HIDDEN COMPLEXITY ADMIN.CSS HOMEPAGE ADMIN PURCHASING SEARCH REFERRALS

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MORE HIDDEN COMPLEXITY ADMIN.CSS HOMEPAGE ADMIN SEARCH REFERRALS

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MORE HIDDEN COMPLEXITY ADMIN.CSS HOMEPAGE ADMIN SEARCH CACHE REFERRALS

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MORE HIDDEN COMPLEXITY ADMIN.CSS HOMEPAGE ADMIN CACHE REFERRALS

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ENTANGLEMENTS

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ENTANGLEMENTS user.signed_up.chronologically.approved. active_orders.in_zip(:east_cost). unshipped.first.try(:first_name)

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ENTANGLEMENTS

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ENTANGLEMENTS after_create do |user| end

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ENTANGLEMENTS after_create do |user| end UserMailer.send_welcome(user.id)

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ENTANGLEMENTS after_create do |user| end UserMailer.send_welcome(user.id) PaymentProcessor.add_customer(user.id)

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ENTANGLEMENTS after_create do |user| end UserMailer.send_welcome(user.id) PaymentProcessor.add_customer(user.id) MarketingTrackingSite.event!(user.id)

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ENTANGLEMENTS after_create do |user| end UserMailer.send_welcome(user.id) PaymentProcessor.add_customer(user.id) MarketingTrackingSite.event!(user.id) OtherTrackingSite.event!(user.id)

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OH, AND… ▸ Test suite is glacial ▸ Don't even think about looking in app/assets/javascripts ▸ /admin starts acting up -> www is dead, too ▸ Etc.

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REMEMBER WHAT FAILURE LOOKS LIKE? ▸ Simple changes difficult ▸ Difficult changes impossible ▸ Low morale ▸ Brain drain

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REMEMBER WHAT FAILURE LOOKS LIKE? ▸ Simple changes difficult ▸ Difficult changes impossible ▸ Low morale ▸ Brain drain

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MICROSERVICES FROM DAY 1 NEVER AGAIN

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BEFORE EVEN STARTING…

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BEFORE EVEN STARTING… ▸ Deploy lots of apps

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BEFORE EVEN STARTING… ▸ Deploy lots of apps ▸ Authentication

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BEFORE EVEN STARTING… ▸ Deploy lots of apps ▸ Authentication ▸ Versioning

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BEFORE EVEN STARTING… ▸ Deploy lots of apps ▸ Authentication ▸ Versioning ▸ JSON format

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BEFORE EVEN STARTING… ▸ Deploy lots of apps ▸ Authentication ▸ Versioning ▸ JSON format ▸ Which HTTP library?

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BEFORE EVEN STARTING… ▸ Deploy lots of apps ▸ Authentication ▸ Versioning ▸ JSON format ▸ Which HTTP library? ▸ Argue about REST and status codes

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OH, AND WHAT SERVICES DO WE ACTUALLY NEED?

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THREE MONTHS LATER

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THREE MONTHS LATER ▸ React front-end

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THREE MONTHS LATER ▸ React front-end ▸ Hits the Backend-for-frontends (BFF)

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THREE MONTHS LATER ▸ React front-end ▸ Hits the Backend-for-frontends (BFF) ▸ BFF talks to the underlying auth service

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THREE MONTHS LATER ▸ React front-end ▸ Hits the Backend-for-frontends (BFF) ▸ BFF talks to the underlying auth service ▸ Then hits the role service

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THREE MONTHS LATER ▸ React front-end ▸ Hits the Backend-for-frontends (BFF) ▸ BFF talks to the underlying auth service ▸ Then hits the role service ▸ Then decorates with the consumer data

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THREE MONTHS LATER ▸ React front-end ▸ Hits the Backend-for-frontends (BFF) ▸ BFF talks to the underlying auth service ▸ Then hits the role service ▸ Then decorates with the consumer data ▸ To render “Hello, #{first_name}!”

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THREE MONTHS LATER ▸ React front-end ▸ Hits the Backend-for-frontends (BFF) ▸ BFF talks to the underlying auth service ▸ Then hits the role service ▸ Then decorates with the consumer data ▸ To render “Hello, #{first_name}!” ▸ Managed by Docker, Ansible, AWS, Terraform, Vault, Bash, and, of course, some Go

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WHAT HAPPENED?

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WHAT HAPPENED? ▸ Money has been spent

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WHAT HAPPENED? ▸ Money has been spent ▸ Blog posts all over Hacker News

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WHAT HAPPENED? ▸ Money has been spent ▸ Blog posts all over Hacker News ▸ Meetups have been attended

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WHAT HAPPENED? ▸ Money has been spent ▸ Blog posts all over Hacker News ▸ Meetups have been attended ▸ No actual business value

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WHAT HAPPENED? ▸ Money has been spent ▸ Blog posts all over Hacker News ▸ Meetups have been attended ▸ No actual business value ▸ Nothing to show

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WHAT HAPPENED? ▸ Money has been spent ▸ Blog posts all over Hacker News ▸ Meetups have been attended ▸ No actual business value ▸ Nothing to show ▸ Is there any money left?

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REMEMBER WHAT FAILURE LOOKS LIKE? ▸ Simple changes difficult ▸ Difficult changes impossible ▸ Low morale ▸ Brain drain

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REMEMBER WHAT FAILURE LOOKS LIKE? ▸ Simple changes difficult ▸ Difficult changes impossible ▸ Low morale ▸ Brain drain

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LET'S DO THIS OK MONOLITH

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AS LONG AS WE _NOTICE_ THE MESS, WE CAN CLEAN IT UP —Pat Agîlecønßultånt

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MORE DEVELOPERS!

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MORE DEVELOPERS!

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MORE HIDDEN COMPLEXITY HOMEPAGE ADMIN PURCHASING SEARCH REFERRALS

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MORE HIDDEN COMPLEXITY ADMIN.CSS HOMEPAGE ADMIN CACHE REFERRALS NOW, IT’S TOO MESSY!

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No content

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MORE HIDDEN COMPLEXITY HOMEPAGE ADMIN PURCHASING SEARCH REFERRALS

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MORE HIDDEN COMPLEXITY HOMEPAGE ADMIN PURCHASING REFERRALS PROMO CODES

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CLEANING THE AIRPORT BATHROOM ▸ Requires top engineers ▸ Grueling ▸ Small changes difficult ▸ Bigger changes become delayed

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REMEMBER WHAT FAILURE LOOKS LIKE? ▸ Low morale ▸ Brain drain

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REMEMBER WHAT FAILURE LOOKS LIKE? ▸ Low morale ▸ Brain drain

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THERE _IS_ ANOTHER WAY NO BLUR,

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WHILE IT'S IMPOSSIBLE TO PREDICT THE FUTURE, WE DON'T NEED TO ACT BLIND TO IT. Chris Reasonable

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DON'T BE BLIND TO THE FUTURE ▸ More developers, more features, more code, more changes ▸ You'll want things decoupled; but not exactly what. ▸ Don't make a mess in the first place

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ENABLE DECOUPLING ▸ One rails app per business function ▸ No business logic in Active Record models ▸ Use the Rule of Three to guide decisions around abstraction, tooling, de- coupling, and general pattern identification.

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RULE OF THREE ▸ 1st and 2nd times aren't a pattern. ▸ 3rd time is - use that to create needed tooling or process changes ▸ This is engineering culture ▸ Mature teams can graduate to the Rule of Two :) Effort 1ST 2ND 3RD 4TH 5TH 6TH

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EXAMPLES ▸ Third Rails app - create it with a re-usable generator ▸ Third Ruby Gem - create it with a re-usable gem scaffold ▸ Third mess you make with jQuery - consider a front-end framework ▸ Third time customers report an outage - improve monitoring

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WWW SHARED DATABASE

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WWW CUSTOMER SERVICE SHARED DATABASE

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WWW CUSTOMER SERVICE MARKETING SHARED DATABASE

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WWW CUSTOMER SERVICE MARKETING SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS

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WWW CUSTOMER SERVICE MARKETING SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS PROMO CODE LOGIC PROMO CODE LOGIC

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WWW CUSTOMER SERVICE MARKETING SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS PROMO CODE LOGIC PROMO CODE LOGIC CACHE

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WWW CUSTOMER SERVICE MARKETING SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS PROMO CODE LOGIC PROMO CODE LOGIC CACHE

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WWW CUSTOMER SERVICE MARKETING SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS ANALYTICS PROMO CODE LOGIC PROMO CODE LOGIC CACHE

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WWW CUSTOMER SERVICE MARKETING FINANCE SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS ANALYTICS PROMO CODE LOGIC PROMO CODE LOGIC CACHE

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WWW CUSTOMER SERVICE MARKETING FINANCE SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS ANALYTICS PROMO CODES HTTP CACHE

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WWW CUSTOMER SERVICE MARKETING FINANCE SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS ANALYTICS PROMO CODES HTTP CACHE

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WWW CUSTOMER SERVICE MARKETING FINANCE SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS ANALYTICS PROMO CODES HTTP PRIVATE DATABASE CACHE

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WWW CUSTOMER SERVICE MARKETING FINANCE SHARED DATABASE SHARED MODELS SHARED MODELS SHARED MODELS ANALYTICS PROMO CODES HTTP PRIVATE DATABASE PRIVATE DATABASE CACHE

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YOUR ARCHITECTURE ISN'T EVER "DONE"

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YOUR ARCHITECTURE PLANS SHOULD BE HOW IT CHANGES NOT WHAT IT SHOULD BE

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ENTERPRISE BEGINS

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WHAT DID WE LEARN EXACTLY? ▸ Don't be blind to the future (this is different than predicting it!) ▸ Write code to enable change ▸ Create a culture of change, based on the Rule of Three ▸ Your architecture must evolve and is never "done" ▸ Don't make a mess

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25% off CODE RailsConf16 FULL-STACK-RAILS.COM SWENG.ME NEED RANTS ABOUT BAD UX AND JAVASCRIPT? @DAVETRON5000 WANT TO WORK THIS WAY? TECH.STITCHFIX.COM/CAREERS/ FINAL SLIDE OF SELF-PROMOTION