How Developer Support Works

by Naoki Ainoya

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։ൃࢧԉͱ͍͏࢓ࣄ !OBPLJBJOPZB 3FDSVJU.BSLFUJOH1BSUOFSTDP MUE

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w BJOPZB w dNJYJ w dOPXSFDSVJU w ΠϯϑϥͱΞϓϦ։ൃ͕  ŧŔŕŪũƄŝſΤϯδχΞ BJOPZBJP

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γϯϓϧͳϏϧυύΠϓϥΠϯπʔϧXBMUFSΛϦϦʔε͠·ͨ͠c"EWBODFE5FDIOPMPHZ-BC IUUQBUMSFDSVJUUFDIDPKQCMPH 8BMUFSWCFUBΛϦϦʔε͠·ͨ͠c"EWBODFE5FDIOPMPHZ-BC IUUQBUMSFDSVJUUFDIDPKQCMPH

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)PXUPQMBZ4DBMBPOEPDLFSJ[FEJOGSBTUSVDUVSF4QFBLFS%FDL IUUQTTQFBLFSEFDLDPNBJOPZBIPXUPQMBZTDBMBPOEPDLFSJ[FEJOGSBTUSVDUVSF

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IUUQTFJHPTBQVSJKQ

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ΪϦΪϦ6OEFS ͋ͱ̑ϲ݄Ͱ͍̏͞Ͱ͕͢ ͕Μ͹Γ·͢

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ࠓ΍͍ͬͯΔ͜ͱ

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l։ൃࢧԉz

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4JUF3FMJBCJMJUZ&OHJOFFSJOH %FWFMPQFS1SPEVDUJWJUZ&OHJOFFSJOH ηΩϡϦςΟରԠ ΤϯδχΞ࠾༻ɾਓࣄɾ૊৫׆ੑ ࣾ಺*5 FUDʜ

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ࢧԉର৅ ฐࣾ಺੡։ൃ૊৫಺ͷ ෳ਺ϓϩμΫτ܈

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l։ൃΛՃ଎ͤ͞ΔͨΊͷ։ൃz ͳΒ ͳΜͰ΋΍Δ

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ͳͥ΍Δͷ͔ʁ

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ΤϯδχΞʹ σΟʔϓɾϫʔΫ ͯ͠΋Β͏ͨΊ

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େࣄͳ͜ͱʹूத͢Δ ϢʔβʹՁ஋Λಧ͚Δ͜ͱ ͨͩҰ఺ʹूதͰ͖Δ ؀ڥͷͨΊʹ

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ϢʔβʹՁ஋Λಧ͚ΔͨΊʹ ຊ࣭తͰͳ͍ɺෆཁͳ ίετɾ࣌ؒɾ࣌ؒΛ࡟Δ γϟϩʔϫʔΫΛۃখԽ͢Δͷ͕໨త

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ྫ͑͹

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ϋΠύϫʔ$*ϚγϯಋೖͰ Ϗϧυ࣌ؒ୹ॖ

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Ϗϧυ࣌ؒͷ ୹ॖ 4DBMBϓϩδΣΫτͷ ίϯύΠϧ ʴ ςετ ʴ EPDLFSJNBHFੜ੒ ࣌ؒΛʹ

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Ϗϧυ࣌ؒͷ୹ॖ ʹ ࣌ؒ͸ۚͰങ͑Δ ʢ͔͔ͨͩ̎̌ສͰ

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ͱ͸͍͑ɺ ͓ۚͷແବݣ͍͸

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ྫ͑͹ɺ2"

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Ͱςελʔ͞ΜΛूΊͯ ࿑ಇू໿తʹςετ

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େྔͷςετ߲໨Λ ख࡞ۀͰ࣮ࢪ ϦϦʔε·Ͱ੾Ӌ٧·͍ͬͯΔͱ͋Γ͕ͪ

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ఆٛʹैͬͯػցతʹ ͜ͳͤΔ΋ͷ͸ ࣗಈԽ͢Δ΂͖

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ςελʔ͞Μʹ͸ ਓؒͰͳ͍ͱൃݟ͕ ೉͍͠όάΛ୳͢͜ͱʹ ूதͯ͠΄͍͠

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εϚϗΞϓϦͷςετ ࣗಈԽج൫ͷಋೖ

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0QFO45'ͷ ಋೖ ݕূ୺຤ͷςετϑΝʔϜߏங αΠόʔ͞Μ͓ੈ࿩ʹͳͬͯ·͢

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0QFO45'ͷ ಋೖ ϦϞʔτϫʔΫ࣌΋ ݕূ୺຤ར༻͕༰қʹ

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"QQJVNʹΑΔ ࣮ػFFςετ ݕূɾಋೖ 0QFO45'4BVDFMBCTΛ ςετϑΝʔϜͱͯ͠ ࣗಈԽج൫Λߏங <3.1Y2VJQQFSNFFUVQ>։ൃͷͨΊͷ։ൃdεϚϗΞϓϦ޲͚FFςετͷݕূಋೖࣄྫΛ௨ͯ͡d4QFBLFS%FDL IUUQTTQFBLFSEFDLDPNBJOPZBSNQYRVJQQFSNFFUVQOVNCFSLBJGBGBMTFUBNFGBMTFLBJGBTVNBIPBQVSJYJBOHLFFFUFTVUPGBMTFKJBO[IFOHEBPSVTIJMJXPUPOH[JUF

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"QQJVNʹΑΔ ࣮ػFFςετ ςετ࣮ߦͷ࢓૊ΈΛ ੔͑ͨ <3.1Y2VJQQFSNFFUVQ>։ൃͷͨΊͷ։ൃdεϚϗΞϓϦ޲͚FFςετͷݕূಋೖࣄྫΛ௨ͯ͡d4QFBLFS%FDL IUUQTTQFBLFSEFDLDPNBJOPZBSNQYRVJQQFSNFFUVQOVNCFSLBJGBGBMTFUBNFGBMTFLBJGBTVNBIPBQVSJYJBOHLFFFUFTVUPGBMTFKJBO[IFOHEBPSVTIJMJXPUPOH[JUF

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"QQJVNʹΑΔ ࣮ػFFςετ $IBMMFOHJOHͳ औΓ૊Έ΋ Perceptual diffsʹΑΔσάϨͷݕग़཰ڧԽ  https://github.com/uber/image-diff <3.1Y2VJQQFSNFFUVQ>։ൃͷͨΊͷ։ൃdεϚϗΞϓϦ޲͚FFςετͷݕূಋೖࣄྫΛ௨ͯ͡d4QFBLFS%FDL IUUQTTQFBLFSEFDLDPNBJOPZBSNQYRVJQQFSNFFUVQOVNCFSLBJGBGBMTFUBNFGBMTFLBJGBTVNBIPBQVSJYJBOHLFFFUFTVUPGBMTFKJBO[IFOHEBPSVTIJMJXPUPOH[JUF

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ࣗಈԽʹΑΔ࡟ݮ ͚ͩͰͳ͘ʜ

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2"σΟϨΫγϣϯͷ ෛՙ࡟ݮ σΟϨΫλʔͷ γϟϩʔϫʔΫ࡟ݮ

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σΟϨΫλʔҎ֎ʹ΋ʜ ΤϯδχΞ୲౰֎ͷ࢓ࣄ γϟϩʔϫʔΫͩΒ͚

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ྫ͑͹ ϚʔέςΟϯά୲౰ σʔλूܭۀ຿

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ڪΔ΂͖ ਓྗεΫϨΠ ϐϯά ച্ूܭγεςϜ σʔλग़ྗ"1*΍ σʔλμϯϓػೳ͕ͳ͔ͬͨ ػೳ௥Ճͷ໨ॲ΋ͨͨͳ͍ ˣ ଞࣾ؅ཧԼͷച্ूܭը໘Λ ̍ϖʔδͣͭΊͬͯ͘ &YDFMʹసࣸʜ

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4DSBQZʹΑΔ ͓खܰ εΫϨΠϐϯά ਓखͰ͸࣮ݱෆՄೳͩͬͨ ස౓Ͱͷച্ܭଌ͕ Ͱ͖ΔΑ͏ʹ

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4DSBQZʹΑΔ ͓खܰ εΫϨΠϐϯά 4DSBQZΫϩʔϥ޲͚ ϑϨʔϜϫʔΫ ਺ेߦॻ͚͹ͦͦ͜͜ಈ͘  Ϋϩʔϥ͕ͭ͘ΕΔ  ͓͢͢Ί http://asheesh.org/pub/scrapy-talk/#1

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ϧʔνϯϫʔΫ ଞʹ΋·ͩ·ͩͨ͘͞Μ͋Δ

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ձٞࣨ༧໿

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શࣾඪ४ͷձٞࣨ༧໿γεςϜ ͋ΒΏΔ*5Ϧςϥγɾۀ຿ܗଶͷશࣾһ ਺ສਓن໛ ͕ ౳͘͠࢖͑Δ΂͘࡞ΒΕͨݹͷγεςϜ

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ՄೳͳݶΓ࢖͍΍͘͢ ม͑Δ͜ͱ͕೉͍͠΋ͷΛ ࣗ෼͕ͨͪม͑ΒΕΔൣғͰม͍͑ͯ͘ ձٞࣨ༧໿ΞϓϦΛ ձٞࣨલʹઃஔ 4MBDLJOUFHSBUJPO

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ଞʹ΋͍Ζ͍Ζ ίπίπࣗಈԽ

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w ϝʔϧͰ͔͠ల։͞Εͳ͍৘ใڞ༗ɻΤϯδχΞ औΓ͜΅͢  4MBDLʹྲྀ͢࢓૊Έ࣮૷ .JDSPTPGUqPXΛར༻ w QSJWBUFͳTMBDLDIBOOFMͷQVCMJDԽ  DIBOOFMͷΞʔΧΠϒɾϦωʔϜͱ৽ن࡞੒Λ  ߦ͏CPU࣮૷ w ۀ຿πʔϧ܈ͷΞΧ΢ϯτਃ੥ɾ؅ཧ  (PPHMF'PSN4MBDLͰDIBUPQTͳ෷͍ग़͠

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γϟϩʔϫʔΫ͸ΤϯδχΞ͔Β ௚઀ݟ͑ͳ͍ͱ͜Ζʹ΋ ࢁ΄Ͳ͋Δ

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ίετͱ࣌ؒ͸ ͪΓͭ΋ࣜʹ૿͑ͯ ϦϦʔε଎౓Λ஗ͤ͘͞Δ

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–Tom DeMarco, দݪ ༑෉༁ ʮϐʔϓϧ΢ΣΞʯ lձࣾͷϧʔνϯϫʔΫ͸ɺबۀ࣌ؒʹݟ߹͏ͱ ͜Ζ·Ͱ๲ு͢Δ܏޲͕͋Δz

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ΤϯδχΞྲྀͷղܾ๏Ͱ γϟϩʔϫʔΫΛ ௵͍͖ͯ͠·͠ΐ͏

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(4ͷهࣄ IUUQTXXXUFDIOPMPHZSFWJFXKQTBTHPMENBOFNCSBDFTBVUPNBUJPOFWFOUIFNBTUFSTPGUIFVOJWFSTFBSFUISFBUFOFE

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–Joel Spolsky ੨໦ ༃༁ ʮMore Joel on Softwareʯ l͝Έ͋Δͱ͜Ζʹۚ͸͋Δz

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–Eric Sink, ੨໦ ༃༁ ʮֵ৽తιϑτ΢ΣΞاۀͷ࡞Γํʯ lιϑτ΢ΣΞ։ൃऀ͸ձࣾͷதͰࣗ෼͕࠷΋ॏཁͳਓؒͩͱࢥ͍ ࠐΉ܏޲͕͋Δɻ͍͋ʹ͘ͱ͜ͷଚେ͞ʹ͸͍ͬ΃Μͷਅ࣮͕͋Γɺ ։ൃऀ͕ଞͷਓͨͪͱ͏·͘ંΓ߹͏ͷΛ೉͍ͯ͘͠͠ΔɻͦΕͰ ΋ࢲͷओு͸มΘΒͳ͍ɻ։ൃऀͷεΩϧ͸ίʔσΟϯάҎ֎ͷ͞ ·͟·ͳλεΫʹ΋ద༻Մೳͳͷͩɻ ɾΧελϚαʔϏε୲౰ͱͯ͠ɺ੡඼ͷ࢓૊ΈΛཧղ͍ͯ͠Δ ։ൃऀ͸໰୊ΛΑΓૣ͘ݟ͚ͭΔ͜ͱ͕Ͱ͖Δ ɾηʔϧεΨΠͱͯ͠ɺ੡඼ͷ࢓૊ΈΛཧղ͍ͯ͠Δ։ൃऀ͸ ͦΕͰԿ͕Ͱ͖Δͷ͔ͱ͍͏࣭໰ʹ༰қʹ౴͑Δ͜ͱ͕Ͱ͖Δɻ ɾϚʔέςΟϯά୲౰ͱͯ͠ɺ։ൃऀ͸ϚʔέοτઓུʹӨڹ͢Δ ٕज़తͳબ୒͕͔͔ΘΔܾஅʹ໾ཱͭ͜ͱ͕Ͱ͖Δɻ اۀ͸͸։ൃऀ͕ιϑτ΢ΣΞߏஙҎ֎ͷ׆ಈʹ͔͔ΘΔ͜ͱΛ ڪΕΔ΂͖Ͱ͸ͳ͍ɻz