Feedback Loops in Development

Transcript

1. ιϑτ΢ΣΞ։ൃͷ

   ϑΟʔυόοΫϧʔϓ

   Feedback Loops in Development
   Shoma Suzuki @shoma

   2018/09/13 at CircleCI&Sider Meetup
   

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2. About Me
   

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3. ιϑτ΢ΣΞ։ൃϥΠϑαΠΫϧ
   *%&" %&7&-01 3&-&"4&
   

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4. αΠΫϧͱͯ͠ճΓଓ͚Δ
   *%&" 3&-&"4&
   %&7&-01
   '&&%#"$,
   

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5. Feedback Loops
   *%&" 3&-&"4&
   %&7&-01
   '&&%#"$,
   '&&%#"$,
   '&&%#"$,
   '&&%#"$,
   

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6. Feedback Loops ͷϦʔυλΠϜ
   ݄
   ि

   ೔

   ೔
   ࣌
   ෼

   ඵ
   IUUQTDPNNPOTXJLJNFEJBPSHXJLJ'JMF&YUSFNF@1SPHSBNNJOHTWH
   
   

   $$#:4"
   

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7. Feedbackͱίετ
   *%&" %&7&-01 3&-&"4&
   ίετ
   ࣌ؒ 1IBTF
   
   

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8. Feedback Loops in Develop
   • Design Review
   • Lint/Static Code Analysis
   • Compile
   • Pair/Mob Programming, Code Review
   • Test
   

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9. Design Review
   • ʮԿΛʯʮԿͷͨΊʹʯʮͲͷΑ͏ʹʯ࡞Δ͔ʁ
   • ։ൃͷഎܠ΍໨తͷ໌֬Խ
   • Quality/Cost/Delivery ͷ߹ҙ
   • ϦεΫͷࢥߟ࣮ݧ
   • Design Docͱͯ͠·ͱΊΔ͜ͱ΋
   

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10. Lint, Static Code Analysis
    • ߴ଎ (ଞͷखஈʹൺ΂ͯ)
    • ΤσΟλ/IDE ্Ͱ΋࣮ߦՄೳ
    • Coding Style ͷ౷ҰͳͲ΋
    • ؇ΊͷϧʔϧͰಋೖͯ͠ίʔυվળͭͭ͠ݫ
    ͘͠
    

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11. Compile
    • ࠷ۙͷίϯύΠϥ͸ݡ͘༏͍͠
    • eg. Haskel, Rust
    • ʮίϯύΠϧͰ͖Δʯ͸ ඞਢ
    • ͕ͩɺoption Ͱ level ௐ੔͕(͍͍ͨͯ)Մೳ
    • eg. gcc -Wall
    

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12. Pair/Mob Programming, 

    Code Review
    • ҉໧஌ͱͳΓ͕ͪͳϊ΢ϋ΢Λڞ༗Ͱ͖Δ৔
    • ʮ໰୊ vs ࢲͨͪʯओޠ͸ίʔυ
    • HRTݪଇ (2)
    • Humility(ݠڏ), Respect(ଚܟ), Trust(৴པ)
    • ΑΓྑ͍ίʔυ (ղܾࡦ) ΛੜΉػձ
    

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13. Test
    • Test Level ͷఆٛͱ࣮ߦ (Test Pyramid)
    • Unit/Functional/Integration(UI)/Exploratory
    • Testing vs Checking (3)
    • Smoke Test Ͱ΋ޮՌ͕͋Δ
    • Mythical Unit Test Coverage (4)
    • มߋ༰қੑ
    

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14. Feedback Loops in Release
    • Dog Fooding
    • Canary Release
    • Staged Rollouts (ஈ֊ϦϦʔε)
    • Testing in Production
    • Monitoring (Mackerel, Datadog, NewRelic)
    • Error Tracking (Sentry, Rollbar, Crashlytics, kibana)
    

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15. Post-mortem (ৼΓฦΓ)
    • ࣦഊ͔ΒֶͿ
    • ੹೚௥ٴͰ͸ͳ͍
    • ݪҼͱରࡦͷ௥ٻ
    • ϝϧΧϦͷ3ͭͷValueͰऔΓ૊ΉΠϯγσϯτର
    Ԡ
    • ࣦഊͷՊֶ ϚγϡʔɾαΠυ
    

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16. Feedback Loops ͕ճΓଓ͚Δͱ…
    

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17. Marginal Gains (վળͷੵΈॏͶ)
    • The whole principle came from the idea that if you
    broke down everything you could think of that goes into
    riding a bike, and then improved it by 1%, you will get a
    significant increase when you put them all together
    • 1%ͷվળͷੵΈॏͶଓ͚Δ͜ͱ͕ɺେ͖ͳࠩͱͳΔ (ҙ
    ༁)
    • Sir. Dave Brailsford (2012), (ex-British Cycling, Team-Sky)
    (5)
    

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18. Fail Early, Fail Often, Fail Well
    

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19. Appendix
    1. https://en.wikipedia.org/wiki/Extreme_programming
    2. Team Geek Brian, W. Fitzpatrick
    3. TDD is dead. Long live testing. David Heinemeier Hansson
    4. Mythical Unit Test Coverage, IEEE Software ( Volume: 35,
    Issue: 3, May/June 2018 )
    5. Olympics cycling: Marginal gains underpin Team GB
    dominance
    

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