大容量データのダウンロード戦略

by misyobun

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େ༰ྔμ΢ϯϩʔυ ઓུ %SPJE,BJHJ !NJTZPCVO (.0ϖύϘ

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େ༰ྔͬͯɺ΋ͪΖΜϖλό Πτ 1# Ϩϕϧͷ͜ͱͩΑ Ͷʁ

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͍͍͑

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ςϥόΠτ 5# Ϩϕϧͷ͜ͱ ͩΑͶʁ

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͍͍͑

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ΪΨόΠτ (# Ϩϕϧͬ ͠ΐʁ

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͍͍͑

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ʙ.#

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BOESPJEBQQ%PXOMPBE.BOBHFS ͘͢͝ศར

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͓खܰ

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ΞϓϦͷ࢓༷తʹ࢖͑ͳ͍৔߹͕͋Δ wΞϓϦ಺ͷ6*69ʹμ΢ϯϩʔυମݧ Λ૊ΈࠐΈ͍ͨ w(PPHMFۘ੡ͷμ΢ϯϩʔυΞϓϦͰਐ ௙ঢ়گΛ֬ೝͤͨ͘͞ͳ͍ wμ΢ϯϩʔυͷ༏ઌॱҐΛಠࣗʹߟྀ ͍ͨ͠

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ແ͚Ε͹࡞Ε͹͍͍ !IJLB

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ಠࣗʹμ΢ϯϩʔμʔ ͷ࢓૊ΈΛ࡞Ζ͏

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BOESPJEBQQ%PXOMPBE.BOBHFS ࢀߟʹ͢Δ

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%PXOMPBE.BOBHFS %PXOMPBE1SPWJEFS %PXOMPBE4FSWJDF %PXOMPBE*OGP %PXOMPBE5ISFBE

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͜͜·Ͱͷ·ͱΊ w%PXOMPBE.BOBHFS͸ݸʑͷΞϓϦͷ ࢓༷ʹଈͨ͠ܗͰ૊ΈࠐΉͷ͕೉͍͠ w%PXOMPBE.BOBHFSతͳ࢓૊ΈΛࣗ࡞ ͢Δͱ͍͏Ξϓϩʔν w͡Ό͋ɺ%PXOMPBE.BOBHFSͷ࢓૊Έ Λࢀߟʹ࡞ͬͯΈΑ͏

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%PXOMPBE.BOBHFS %PXOMPBE1SPWJEFS %PXOMPBE4FSWJDF %PXOMPBE*OGP %PXOMPBE5ISFBE

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%PXOMPBE.BOBHFS %PXOMPBE1SPWJEFS %PXOMPBE4FSWJDF %PXOMPBE*OGP %PXOMPBE5ISFBE

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$POUFOU1SPWJEFS w μ΢ϯϩʔυ͢ΔλεΫʹ͍ͭͯঢ়ଶΛ͔ͬ͠Γ௥੻ɾه࿥͢Δ w λεΫͷঢ়ଶΛΈͯμ΢ϯϩʔυॲཧͷϋϯυϦϯάΛߦ͏

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%PXOMPBE.BOBHFS %PXOMPBE1SPWJEFS %PXOMPBE4FSWJDF %PXOMPBE*OGP %PXOMPBE5ISFBE

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4FSWJDF "DUJWJUZ ը໘ʣͱͷੜଘظ͕ؒҟͳΔ ෳ਺ͷը໘ؒΛ·͍ͨͰμ΢ϯϩʔυΛଓߦͰ͖Δ

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Ϣʔβ͕֬ೝ͢Δज़

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Ϣʔβ͕֬ೝ͢Δज़ w/PUJpDBUJPOΛग़͢ wࣗྗͰ࣮૷͢Δ TUBSU'PSFHSPVOE JOUJE BOESPJEBQQ/PUJpDBUJPOOPUJpDBUJPO

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4FSWJDF NBOJGFTUͰผϓϩηεΛࢦఆ͢Δ TFSWJDF BOESPJEOBNF%PXOMPBE4FSWJDF BOESPJEQSPDFTTEPXOMPBE w৽ͨʹώʔϓׂ͕Γ౰ͯΒΕΔ w"DUJWJUZ͕ࢮΜͰ΋λεΫΛࡴ͞ͳ͍ݶΓੜଘ͢Δ

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4FSWJDFPS*OUFOU4FSWJDF 4FSWJDF *OUFOU4FSWJDF εϨου ϝΠϯεϨου ϫʔΧʔεϨου ॲཧํࣜ ύϥϨϧɾγϦΞϧ ʢཁ࣮૷ʣ γϦΞϧ దੑ ෳ਺ͷϑΝΠϧΛಉ࣌ʹμ΢ ϯϩʔυ͢Δͷʹ޲͍͍ͯΔ ୯ҰϑΝΠϧΛஞҰతʹμ΢ ϯϩʔυ͢Δͷʹ޲͍͍ͯΔ

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4FSWJDFͷੜࢮ ϓϩηε໊Λ࢖ͬͨੜଘ֬ೝΛͯ͠ μ΢ϯϩʔυλεΫͷεςʔλεࢀর

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4FSWJDFͷੜࢮ ϓϩηε໊ͷੜଘ֬ೝ

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4FSWJDFͷੜࢮ ػछʹΑͬͯ͸ݺ͹Εͳ͍

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%PXOMPBE.BOBHFS %PXOMPBE1SPWJEFS %PXOMPBE4FSWJDF %PXOMPBE*OGP %PXOMPBE5ISFBE

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5ISFBEͷ਺ 5ISFBEͷ਺ͬͯଟ͍ํ͕μ΢ϯϩʔυΛޮ཰తʹ ߦ͑ΔͷͩΖ͏͔ʁ େ͖͍ϑΝΠϧͱෳ਺ͷখ͍͞ϑΝΠϧΛμ΢ϯϩʔυ ͢Δ৔߹Λߟ͑Δͱͯ͠ɺͦͷ৔߹ɺ֤ϑΝΠϧ͝ͱʹ 5ISFBEΛ෼͚ͨ΄͏͕ྑ͍ͷͩΖ͏͔ʁ

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5ISFBEͷ਺ *41 PS ΩϟϦΞ IUUQ$POOFDUJPO IUUQ$POOFDUJPO 5ISFBE 5ISFBE *41 PS ΩϟϦΞ IUUQ$POOFDUJPO 5ISFBE

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5ISFBEͷ਺ γϯάϧεϨουͰ.ͷσʔλΛ%- εϨου"Ͱ.εϨου#Ͱ.Λݸ%- ࢼߦճ਺ճͷฏۉ

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5ISFBEͷ਺ εϨου"ͱεϨου#Λ࣮ߦͯ͠TFD ࢼߦճ਺ճͷฏۉ ෳ਺ͷίωΫγϣϯΛுͬͨͱͯ͠΋ଳҬ͕༨͍ͬͯͳ͍ݶΓ௨৴ࣗମ͸ ஗͘ͳΔʢஞ࣍ॲཧʹͳΔʣ

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.ͷσʔλΛߏ੒͢Δύέοτ .ͷσʔλΛߏ੒͢Δύέοτ γϯάϧεϨου 5ISFBE"#

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5ISFBEͷ਺ ࢼߦճ਺ճͷฏۉ ෳ਺εϨουͰ..✖️ݸͷ߹ܭ࣌ؒ

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5ISFBEͷ਺ pOBM#MPDLJOH2VFVF3VOOBCMFRVFVFOFX -JOLFE#MPDLJOH2VFVF3VOOBCMF 5ISFBE1PPM&YFDVUPSUISFBE1PPM&YFDVUPS OFX5ISFBE1PPM&YFDVUPS QPPM QPPM 5JNF6OJU.*--*4&$0/%4 RVFVF OFX 5ISFBE1PPM&YFDVUPS$BMMFS3VOT1PMJDZ

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5ISFBEͷ਺ ݸʑͷ%-࣌ؒ͸஗͘ͳΔ͕ɺৗʹ௨৴͕Ͱ͖͍ͯΔͱ૯ͯ͡ %-଎౓͸଎͘ͳͬͨɻ ฒߦॲཧʹΑͬͯίωΫγϣϯΛுΔ౳ͷΦʔόʔϔου͕গ ͳ͘ͳ͍ͬͯΔ

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5ISFBEͷ਺ . . . . . . . . . . . .

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5ISFBEͷ਺

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5ISFBEͷ਺ "041GSBNFXPSLTCBTFDPSFSFTSFT WBMVFTDPOpHYNM

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5ISFBEͷ਺ 7PMMFZͷσϑΥϧτͷ5ISFBEͷ਺

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σʔλΛอଘ͢Δ 00.&

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σʔλΛอଘ͢Δ

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σʔλΛอଘ͢Δ ຖճ'JMF*0ͷͭͳ͗Λ͢Δͱ஗͘ͳΔ

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σʔλΛอଘ͢Δ

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σʔλΛอଘ͢Δ

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σʔλΛอଘ͢Δ

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σʔλΛอଘ͢Δ #V⒎FSFE0VUQVU4USFBNͷόοϑΝͷ஋Λௐ੔͢ Δ͜ͱʹΑͬͯ04ͱΞϓϦؒͰͷλεΫͷ੾ସΛগ ͳ͘͢Δ ʢσϑΥϧτ͸όΠτʣ

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σʔλΛอଘ͢Δ

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σʔλΛอଘ͢Δ ૯ͯ͡ݟΔͱଝ৭ͳ͍

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σʔλΛอଘ͢Δ ॻ͖ࠐΈΩϟογϡ͕͍ͬͺ͍ʹͳΔ·Ͱɺ଴ͪ࣌ؒ ͕ൃੜ͠ͳ͍ͷͰෳ਺5ISFBE͕͋ͬͯ΋ࡹ͚͍ͯΔ Α͏ͩɻ

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௨৴ʴॻ͖ࠐΈ ࢼߦճ਺ճͷฏۉ

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5ISFBEͷ਺ ෳ਺ ୯Ұ ϝϦοτ μ΢ϯϩʔυ଎౓͸଎͘ͳΔ ʢଳҬʹґଘ͢Δʣ ؅ཧָ͕ɺεϨουͷϝϞϦ ͸গͳͯ͘͢Ή σϝϦοτ ؅ཧ͕େม ϝϞϦফඅྔ͸େ͖͍ ෳ਺ΑΓ΋μ΢ϯϩʔυ଎౓ ͸஗͘ͳΔ

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5ISFBEͷ਺ େ༰ྔͳσʔλΛμ΢ϯϩʔυ͢Δ৔߹ɺϢʔβମݧ ͱଞͷΞϓϦͷύϑΥʔϚϯεΛߟྀ͢Δͱγϯάϧ εϨουͰ΋ྑ͍ͱߟ͑ΒΕΔ

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͜͜·Ͱͷ·ͱΊ w μ΢ϯϩʔυ͢ΔλεΫͷঢ়ଶΛ؅ཧ͢Δ ʢ$POUFOU1SPWJEFSʣ w ը໘Λލ͍Ͱμ΢ϯϩʔυΛ͢ΔͳΒ͹ 4FSWJDFΛ࢖͓͏ w 5ISFBEͷ਺ʹ͍ͭͯ͸μ΢ϯϩʔυ͢Δ ίϯςϯπͱଳҬɾϢʔβମݧΛߟྀͯ͠ ܾΊΔ

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μ΢ϯϩʔυͷࣦഊ࣌ w KBWBMBOH0CKFDU w KBWBMBOH5ISPXBCMF w KBWBMBOH&YDFQUJPO w KBWBJP*0&YDFQUJPO w KBWBOFU4PDLFU&YDFQUJPO w KBWBOFU$POOFDU&YDFQUJPO w KBWBMBOH0CKFDU w KBWBMBOH5ISPXBCMF w KBWBMBOH&YDFQUJPO w KBWBJP*0&YDFQUJPO w KBWBOFU6O,OPXO)PTU&YDFQUJPO wιέοτ௨৴ͷ࠷தʹࣦഊ wιέοτ௨৴ࣗମ͕ڋ൱͞Εͨ w઀ଓઌͷΞυϨε͕൑ఆͰ͖ͳ͍

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μ΢ϯϩʔυͷࣦഊ࣌ USZ\ μ΢ϯϩʔυॲཧ ^DBUDI *0&YDFQUJPOF \ UISPXOFX4UPQ3FRVFTU&YDFQUJPO 45"564@'*-&@&3303 F ^

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μ΢ϯϩʔυͷࣦഊ࣌ ࣦഊ͢Δͦͷॠؒ·ͰɺҰମͲΕ͚ͩͷσʔλΛμ΢ϯϩʔ υͨ͠ͷ͔ʁ ࣦഊͨ͠ΒɺવΔ΂͖λΠϛϯάͰ·ͨ࠶։͢Ε͹͍͍ TUBUFN$VSSFOU#ZUFTCZUFT3FBE

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μ΢ϯϩʔυͷ࠶։ 3BOHFϦΫΤετͰμ΢ϯϩʔυΛ։࢝͢Δσʔλ ҐஔΛࢦఆ͢Δ IUUQ63-$POOFDUJPOTFU3FRVFTU1SPQFSUZ 3BOHF CZUFT SBOHF CZUFT CZUFT

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μ΢ϯϩʔυͷਐ௙Λ ఻ୡ͢Δ w"*%-ܦ༝Ͱ4FSWJDF͔Β"DUJWJUZ΁ίʔϧ͢Δ w#SPBEDBTUΛඈ͹͢ʢ஫ҙɿ௨஌ͷཻ౓Λߟྀ͢Δʣ

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͜͜·Ͱͷ·ͱΊ w Կ͔͠Βͷྫ֎͕ൃੜͯ͠΋߄ͯͳ͍Ͱࠓ ͷਐ௙ΛͪΌΜͱ࢒͢ w ਐ௙ঢ়گ͸"*%-͔#SPBEDBTUͰ௨஌͢Δ

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%PXOMPBE.BOBHFS %PXOMPBE1SPWJEFS %PXOMPBE4FSWJDF %PXOMPBE*OGP %PXOMPBE5ISFBE

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·ͱΊ w %PXOMPBE.BOBHFSͷߏ੒ཁૉΛࢀߟʹ ͯ͠ಠࣗͷμ΢ϯϩʔυͷ࢓૊ΈΛ࡞Δ w େม͚ͩͲɺࣗ෼ͷΞϓϦಠࣗͷϢʔβମ ݧΛఏڙ͢Δ͜ͱ͸ྑ͍͜ͱʂ w ؤுΖ͏ʂʂ