Chad Fowler 1 r o w l e a d F C h i z e r t h a n - - PowerPoint PPT Presentation

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Chad Fowler 1 r o w l e a d F C h i z e r t h a n - - PowerPoint PPT Presentation

Aug 14, 2022 340 likes •1.03k views

From Homogeneous Monolith to Radically Heterogeneous Microservices Architecture Chad Fowler 1 r o w l e a d F C h i z e r t h a n s E u s t e m S y w l e r d f o @ c h a 2 HELLO WORLD!!!!!!!!!!!!!!!!! What

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1

From Homogeneous Monolith to Radically Heterogeneous Microservices Architecture

Chad Fowler

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2

C h a d F

  • w

l e r S y s t e m s E u t h a n i z e r @ c h a d f

  • w

l e r

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HELLO WORLD!!!!!!!!!!!!!!!!!

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What is Wunderlist?

Wunderlist is available on iPhone, iPad, Mac, Web, Android, Windows and Windows Phone

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One Monolithic Application

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One Monolithic Database

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One (Backend) Language (Ruby)

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Test suite slow and brittle

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Caching required for survival

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Deployment was terrifying

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Logic buried in abstractions

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Fear Uncertainty Doubt

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Legacy

@chadfowler Systems Euthanizer

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“legacy"

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successful challenged failed

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For business software that’s deployed, the average life expectancy is five years.*

(I made this up)

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OH SH*T!

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How do you CREATE Legacy software?

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richard p. gabriel

http://www.dreamsongs.com/Files/DesignBeyondHumanAbilitiesSimp.pdf

Design Beyond Human Abilities

“Biological systems are very much larger than anything (coherent) that people have built”

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“When a cell is not healthy, an outside cell that’s part of the immune system can command the cell to destroy itself without spreading toxins.”

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homeostasis

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What is a cell?

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What is a system?

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When do you build a system vs. a cell? Are you building the right one now?

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If we get these right, can we build systems that

  • utlive us?
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“Please tell me I’m never going to hear you say you have to do this again.” - a board member

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How do you CREATE Legacy software?

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Heterogenous By Default

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Code is “this big”

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Disposable Software

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tiny databases

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Many tiny services

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HUGE JSON

client

server

client server server server server server server server server

tiny requests

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re-usable services > re-usable components

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Nodes are Disposable

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Never Upgrade Software

  • n an Existing Node

Immutable Deployments

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Threw away Chef

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“wake” = “wunder-make”

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multi-tiered architecture

  • Socket
  • Proxy
  • English
  • German
  • “Write layer”
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Message Queuing

  • Standardized Mutation flow
  • Feeds real-time synchronization to clients
  • Feeds anything else, by convention
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“real time” “smart” proxy

authentication authorization

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Convention Over Configuration

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Convention Over Configuration

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Service Resolution

YAML -> JSON -> Auto-generated JSON -> Consul

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https://codeascraft.com/2011/02/15/measure-anything-measure-everything/

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How We Migrated

  • Removed joins
  • Separated databases
  • New features prototyped new service approach (comments,

files)

  • New features prototyped real-time/mutation approach

(comments)

  • Replace database connections in old API with new APIs (some

ran as long as 7 months)

  • Test under crazy load/behavior (next slide)
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Böse Gurken

https://medium.com/tales-from-6w/saving-our-bacon-with-evil- cucumbers-2e3d26cebacc

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The Big Little Rewrites

Socket “smart” proxy

authentica authorizat

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The Future

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homeostasis

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Global async validation middleware

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Cost Reduction

  • Make it work
  • Make it fast
  • Make it cheap
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http://hans.io/blog/2015/05/05/spot_instances/

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Deployment Speed

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Investigate: How does this work in client code?

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Refactor to Monolith

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Questions?

Please remember to evaluate via the GOTO Guide App