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garyfleming
August 22, 2019
Programming
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Fight Code Rot Using Continuous Improvement
garyfleming
August 22, 2019
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Transcript
FIGHTING CODE ROT USING CONTINUOUS IMPROVEMENT 1995 @garyfleming
1995 @garyfleming
1995 @garyfleming
1995 @garyfleming
1995 @garyfleming
! @garyfleming
NOVEMBER FIFTEEN, NINETEEN NINETY-FIVE @garyfleming
SIXTEEN => SOXTEEN @garyfleming
SIXTEEN => SOXTEEN @garyfleming
TWO THOUSAND SOXTEEN @garyfleming
▸ No source code (written in an older language) ▸
Runs in a green screen terminal, ▸ Has to be emulated. @garyfleming
FIGHT CODE ROT USING CONTINUOUS IMPROVEMENT @GARYFLEMING @garyfleming
WHAT IS CODE ROT? @garyfleming
SYSTEM EXPERIMENT: @garyfleming
SYSTEM EXPERIMENT: FISHES AND TIME ▸ 10 minutes? ▸ 10
hours? ▸ 10 days? ▸ 10000 years? @garyfleming
ROT IN SOFTWARE @garyfleming
! @garyfleming
MULTI-FACETED @garyfleming
Problem KNOWING WHETHER YOUR SOFTWARE IS DEPLOYABLE @garyfleming
BRIEF INTRO TO CI/CD @garyfleming
CONTINUOUS INTEGRATION All developers/testers merge their code to a shared
mainline at least once a day. @garyfleming
CONTINUOUS INTEGRATION Related: ▸ Trunk-Based Development ▸ Feature Toggles @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
CONTINUOUS DEPLOYMENT All changes go to production; safely, quickly, and
sustainably. @garyfleming
CONTINUOUS DEPLOYMENT Related: Blue-Green releases. @garyfleming
@garyfleming
Problem DEPENDENCY UPDATES @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
IDEA UPDATE DEPENDENCIES DAILY @garyfleming
CONTINUOUS REGENERATION @garyfleming
CONTINUOUS REJUVENATION @garyfleming
EXPERIMENT: DEPENDENCY UPDATE DAILY ▸ Update ▸ Build and test
▸ Commit/Revert ▸ Commit causes CD to happen @garyfleming
OUTCOME: DEPENDENCY UPDATE DAILY Mostly success! ▸ Some Major Version
upgrades would need intervention, ▸ Temporary exclusions are important, @garyfleming
DEPENDENCY UPDATES: OTHER LANGUAGES ▸ Single versioned: Maven, Gradle, packages.config
e.g 5.4.1 3.0-ALPHA 1.3.2 @garyfleming
DEPENDENCY UPDATES: OTHER LANGUAGES ▸ Ranges and Lock files: gem/bundler,
most JS frameworks. >=5.4.1 3.* [3.7.1) @garyfleming
DEPENDENCY UPDATES: OTHER LANGUAGES ▸ Possibly open: pip, some JS
frameworks, gem some-dep a-different-dep @garyfleming
ALWAYS USE A LOCK FILE! Avoid "It works on my
machine" @garyfleming
RECENT DEVELOPMENTS ▸ Dependabot ▸ Atomist @garyfleming
GOOD TESTS ARE ESSENTIAL! @garyfleming
Problem RUNTIME ROT @garyfleming
ROT WILL SET IN ▸ JVM ▸ .NET ▸ NPM
version @garyfleming
THE CONTINUOUS NOW @garyfleming
INTERMEDIARY TOOLING ▸ Java -> Jabba ▸ Ruby -> RVM
▸ Node -> NVM ▸ Python -> Virtualenv (to some degree) @garyfleming
Problem STANDING SERVERS @garyfleming
Problem STANDING SERVERS @garyfleming
AVOID SNOWFLAKE SERVERS ▸ Hard to Reproduce ▸ Hard to
Modify ▸ Require manual processes, auditing, and docs. @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
INFRASTRUCTURE AS CODE ▸ Chef/Puppet/Ansible ▸ Terraform ▸ Containerisation ▸
Various cloud toolkits @garyfleming
ENGINEERING PRACTICE ▸ Daily Deletion ▸ Chaos Engineering ▸ Dev
Laptop Wipes @garyfleming
CAUTION: TAKE THE UPDATES @garyfleming
Problem LANGUISHING LANGUAGES @garyfleming
Problem LANGUISHING LANGUAGES @garyfleming
@garyfleming
AVOIDING OBSOLESCENCE ▸ Move to new versions, ▸ Cautiously embrace
new languages, ▸ Design language agnostic APIs @garyfleming
DESTROY YOUR MICROSERVICES @garyfleming
Problem PEOPLE COME AND GO. @garyfleming
Problem PEOPLE COME AND GO. @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
People Prepping RETROS @garyfleming
People Prepping DOMAIN KNOWLEDGE ▸ User Story Maps ▸ Example
mapping @garyfleming
People Prepping STAFF LIQUIDITY MATRICES @garyfleming
@garyfleming
People Prepping BIGGER CHANGES @garyfleming
EVERYTHING IS ROTTING... @garyfleming
...YOU CAN GET BETTER @garyfleming
THANK YOU @GARYFLEMING @garyfleming