Webアプリケーションのキャッシュ戦略とそのパターン / Pattern and Strategy of Web Application Caching

by moznion

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WebΞϓϦέʔγϣϯͷ Ωϟογϡઓུͱ ͦͷύλʔϯ @moznion

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໔੹ ੈͷத৭ʑͳέʔε͕͋Γ·͔͢Β શͯΛΧόʔ͢Δ಺༰͸ແཧͰͨ͠ ͜ͷ಺༰͸҃ΔҰྫͩͱࢥͬͯ ϦϥοΫεͯ͠ோΊ͍ͯͩ͘͞

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@moznion Web application server side engineer Twitter: @moznion GitHub: moznion

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Ωϟογϡ

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ࠓճ࿩͢͜ͱ - WebΞϓϦέʔγϣϯʹ͓͚ΔΩϟογϡʹ͍ͭͯ - HTTPϨΠϠͰͷΩϟογϡ - ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ - ΩϟογϡΛ΍ΊΑ͏

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લఏ: ߴ଎ͳ (Web) ΞϓϦέʔγϣϯΛ ߏஙɾӡ༻͍ͯ͘͠ඞཁ͕͋Δ

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Ωϟογϡͱ͸ͳʹ͔ʁ

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Ωϟογϡʁ ʮΩϟογϡ: ෺ΛӅͨ͠Γ֨ೲͨ͠Γ͓ͯ͘͠ͷʹ҆શͳ৔ॴʯ ― Webster ৽ੈքถޠࣙయɼΧϨοδ൛ ୈ3൛ ʮΩϟογϡͱ͸ௐ΂Δඞཁͷ͋Δ΋ͷΛஔ͍͓ͯ҆͘શͳ৔ॴͷ ͜ͱͰ͋ΔɽΩϟογϡͱ͍͏༻ޠ͸ɼ࠷ॳͷ঎༻ίϯϐϡʔλʹ ͓͍ͯɼϓϩηοαͱओهԱͱͷؒʹૠೖ͞ΕͨهԱ֊૚ϨϕϧΛ දͨ͢Ίʹ࢖༻͞Εͨɽ(தུ) ͜ͷ༻ޠ͸ࠓ೔Ͱ͸ࢀরͷہॴੑΛ ར༻͢ΔΑ͏ʹ؅ཧ͞Εͨ೚ҙͷهԱΛࢦͯ͠΋࢖༻͞ΕΔʯ ― σΠϏου A ύλʔιϯ, δϣϯ ̡ ϔωγʔ ஶ, ੒ా ޫজ ༁ ίϯϐϡʔλͷߏ੒ͱઃܭɼୈ5൛ [Լ] ❞ ❞

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ͳΔ΄Ͳ…

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લఏ: ߴ଎ͳ (Web) ΞϓϦέʔγϣϯΛ ߏஙɾӡ༻͍ͯ͘͠ඞཁ͕͋Δ

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લఏ: ߴ଎ͳ (Web) ΞϓϦέʔγϣϯΛ ߏஙɾӡ༻͍ͯ͘͠ඞཁ͕͋Δ

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ࠓճ࿩͞ͳ͍͜ͱ - WebΞϓϦέʔγϣϯҎ֎ͷΩϟογϡʹ͍ͭͯ - e.g - ϓϩηοαͷΩϟογϡ - DNSΩϟογϡʹ͍ͭͯ΋ࠓճ͸͠·ͤΜ - ଞʹ΋৭ʑͳ࿩Λ͠·ͤΜ

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WebΞϓϦέʔγϣϯʹ͓͚Δ Ωϟογϡͱ͸ͳʹ͔ʁ

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WebΞϓϦέʔγϣϯʹ͓͚ΔΩϟογϡʁ αʔό͕ฦ͢΂͖ίϯςϯπʹ͍ͭͯ…… - 1࣍ετϨʔδΑΓߴ଎ͳετϨʔδʹ  ഑ஔ͓͍͔ͯͯͦ͜͠Βฦ͢ - ΋͘͠͸ฦ͞ͳ͍

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WebΞϓϦέʔγϣϯʹ͓͚ΔΩϟογϡʁ ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ ߴ଎ͳετϨʔδܦ༝Ͱฦ͢ํ HTTPϨΠϠͰͷΩϟογϡ ϨεϙϯεΛฦ͞ͳ͍ํ

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WebΞϓϦέʔγϣϯʹ͓͚ΔΩϟογϡʁ ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ ߴ଎ͳετϨʔδܦ༝Ͱฦ͢ํ HTTPϨΠϠͰͷΩϟογϡ ϨεϙϯεΛฦ͞ͳ͍ํ

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ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ Server Client Primary Storage Heavy Component OR

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ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ Server Client Primary Storage i ii iii iv i. ϦΫΤετ ii. Ұ࣍ετϨʔδ໰͍߹Θͤ iii. ݁ՌΛฦ͢ iv. Ϩεϙϯε

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ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ Server Client Primary Storage i ii iii iv i. ϦΫΤετ ii. Ұ࣍ετϨʔδ໰͍߹Θͤ iii. ݁ՌΛฦ͢ iv. Ϩεϙϯε ͕͜͜ωοΫ ͷ৔߹

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ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ Server Client Primary Storage ii iii Cache Storage

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ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ Server Client Primary Storage i ii iii iv i. ϦΫΤετ ii. Ωϟογϡ໰͍߹Θͤ iii. ݁ՌΛฦ͢ iv. Ϩεϙϯε Cache Storage ii iii

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ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ Server Client Primary Storage i ii iii iv i. ϦΫΤετ ii. Ωϟογϡ໰͍߹Θͤ iii. ݁ՌΛฦ͢ iv. Ϩεϙϯε Cache Storage ii iii Ұ࣍ετϨʔδΑΓ Ωϟγϡ͕ߴ଎ͳΒ ૣ͘ฦͤΔ

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ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ Server Client Primary Storage ii iii Ұ࣍ετϨʔδͱ ΩϟογϡετϨʔδ͸ ͳΜΒ͔಺༰ͷ੔߹Λ औΔඞཁ͕͋Δ Cache Storage

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WebΞϓϦέʔγϣϯʹ͓͚ΔΩϟογϡʁ ΞϓϦέʔγϣϯϨΠϠͰͷΩϟογϡ ߴ଎ͳετϨʔδܦ༝Ͱฦ͢ํ HTTPϨΠϠͰͷΩϟογϡ ϨεϙϯεΛฦ͞ͳ͍ํ

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HTTPϨΠϠͰͷΩϟογϡ Ωϟογϡͱ͸ɺϦιʔεͷ઱౓ʹج͍ͮͯɺҰ౓औಘͨ͠Ϧιʔ εΛΫϥΠΞϯτଆͰ࢖͍·Θ͢ํࣜͰ͢ɻ Ωϟογϡͷར఺͸ɺαʔόͱΫϥΠΞϯτؒͷ௨৴ΛݮΒ͢͜ͱ ͰωοτϫʔΫଳҬͷར༻΍ॲཧ࣌ؒΛॖখ͠ɺΑΓޮ཰తʹॲཧ Ͱ͖Δ͜ͱͰ͢ɻ ― ࢁຊ ཅฏ ஶ WebΛࢧ͑Δٕज़ - HTTPɺURIɺHTMLɺͦͯ͠REST (WEB+DB PRESS plus) ❞

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HTTPϨΠϠͰͷΩϟογϡ Server Client contents

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HTTPϨΠϠͰͷΩϟογϡ Server Client i ii i. ίϯςϯπ͘Εʙ ii. ͸͍Αʙ contents

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HTTPϨΠϠͰͷΩϟογϡ Server Client i ii i. ίϯςϯπ͘Εʙ ii. ͸͍Αʙ contents ίϯςϯπ͕ωοτϫʔΫʹ৐Δ (serverͷཪଆͰ͸ߋʹॏ͍ॲཧ͕૸͍ͬͯΔ͔΋) contents

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HTTPϨΠϠͰͷΩϟογϡ Server Client contents contents ΫϥΠΞϯτଆͰίϯςϯπΛอ࣋

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HTTPϨΠϠͰͷΩϟογϡ Server Client contents contents i ii i. ίϯςϯπ͘Εʙ ii. ΋͏࣋ͬͯ·͢Α

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HTTPϨΠϠͰͷΩϟογϡ Server Client contents contents i ii i. ίϯςϯπ͘Εʙ ii. ΋͏࣋ͬͯ·͢Α ίϯςϯπ͸ωοτϫʔΫʹ৐Βͳ͍ ʮ΋͏࣋ͬͯ·͢Αʯͱ͍͏৘ใ͕৐Δ

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HTTPϨΠϠͰͷΩϟογϡ ͨͩ͠ɺݹ͍ΩϟογϡΛར༻ͯ͠͠·͍ɺ৘ใͷ৴པੑ͕Լ͕Δ Մೳੑ΋͋Γ·͢ɻ ― ࢁຊ ཅฏ ஶ WebΛࢧ͑Δٕज़ - HTTPɺURIɺHTMLɺͦͯ͠REST (WEB+DB PRESS plus) ❞

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ࠓճ͸ओʹΞϓϦέʔγϣϯϨΠϠͷ Ωϟογϡͷ࿩͕ଟ͍Ͱ͢ (HTTPϨΠϠͷ࿩Ͱ΋ڞ௨͢Δ࿩୊͸͋Γ·͢)

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ͳͥΩϟογϡΛ࢖͏ͷ͔ʁ

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ͳͥΩϟογϡΛ࢖͏ͷ͔ʁ ϦΫΤετΛߴ଎ʹฦ٫͢ΔͨΊ Ϣʔβମݧͷ޲্ ୯Ґ࣌ؒ͋ͨΓͷॲཧ਺Λ૿Ճͤ͞ΔͨΊ ܭࢉػϦιʔεͷར༻ޮ཰্ঢ ɹɹRequest per secondͷ૿Ճ ಛఆίϯϙʔωϯτ (e.g. RDBMS) ͷෛՙ௿ݮͷͨΊ γεςϜͷ҆ఆӡ༻ (͔͠͠৔߹ʹґΔ)

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ϦΫΤετΛߴ଎ʹฦ٫͢Δ Server Client Cache Storage ߴ଎ʹฦ٫͢Δ͜ͱͰ ετϨε͕গͳ͘ͳΓ ϢʔβʔମݧΞοϓʂ ⚡⚡⚡

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୯Ґ࣌ؒ͋ͨΓͷॲཧ਺ͷ૿Ճ Server Client Cache Storage ୯Ґ࣌ؒ͋ͨΓͷॲཧ਺ ૿ՃʹΑΓҰ౓ʹ ͨ͘͞ΜͷϦΫΤετΛ ͞͹͚Δ Client Client . . .

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ಛఆίϯϙʔωϯτͷෛՙܰݮ Server Client Client . . . Storage (৭ʑͳࣄ͕͋Γ) ετϨʔδʹෛՙ͕ूத͍ͯ͠Δʂ

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ಛఆίϯϙʔωϯτͷෛՙܰݮ Server Client Client . . . Storage Cache Storage

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ಛఆίϯϙʔωϯτͷෛՙܰݮ Server Client Client . . . Storage Cache Storage Ωϟογϡʹಀ͕ͯ͠ ΍Δ͜ͱͰ աෛՙίϯϙʔωϯτͷ ෛՙΛܰݮ͢Δ

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ಛఆίϯϙʔωϯτͷෛՙܰݮ Server Client Client . . . Storage Cache Storage ͔͠͠Ωϟογϡίϯϙʔωϯτ͕ ૿͑Δ͜ͱͰγεςϜͱͯ͠ͷ ނোՄೳੑ͸૿Ճ͢Δʂ

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ͳͥΩϟογϡΛ࢖͏ͷ͔ʁ ϦΫΤετΛߴ଎ʹฦ٫͢ΔͨΊ Ϣʔβମݧͷ޲্ ୯Ґ࣌ؒ͋ͨΓͷॲཧ਺Λ૿Ճͤ͞ΔͨΊ ܭࢉػϦιʔεͷར༻ޮ཰্ঢ ɹɹRequest per secondͷ૿Ճ ಛఆίϯϙʔωϯτ (e.g. RDBMS) ͷෛՙ௿ݮͷͨΊ γεςϜͷ҆ఆӡ༻ (͔͠͠৔߹ʹґΔ) ͭ·ΓΧω΍ʂʂʂ

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ͳͥΩϟογϡΛ࢖͏ͷ͔ʁ ϦΫΤετΛߴ଎ʹฦ٫͢ΔͨΊ Ϣʔβମݧͷ޲্ ୯Ґ࣌ؒ͋ͨΓͷॲཧ਺Λ૿Ճͤ͞ΔͨΊ ܭࢉػϦιʔεͷར༻ޮ཰্ঢ ɹɹRequest per secondͷ૿Ճ ಛఆίϯϙʔωϯτ (e.g. RDBMS) ͷෛՙ௿ݮͷͨΊ γεςϜͷ҆ఆӡ༻ (͔͠͠৔߹ʹґΔ) ͭ·ΓΧω΍ʂʂʂ Ωϟογϡ͔ʂʁ

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͸͍

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔ - Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ (৭ʑͳ͜ͱ͕͋Δ) - ৭ʑͳཧ༝ͰৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ - ৭ʑ͋ͬͯ֎෦αʔϏεʹґଘ͍ͯ͠Δ - ͳͲͳͲ

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔ - Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ (৭ʑͳ͜ͱ͕͋Δ) - ৭ʑͳཧ༝ͰৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ - ৭ʑ͋ͬͯ֎෦αʔϏεʹґଘ͍ͯ͠Δ - ͳͲͳͲ

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query.

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query..

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query…

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query… ͜͜ͰαʔϏε͕٧·Δ (աෛՙͰDB͕μ΢ϯ͢Δ͔΋ʁ)

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Cache

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Cache Ωϟογϡʹಀ͕͢͜ͱͰ ݱ࣮తͳ࣌ؒͰฦ͢ (ෛՙ΋෼ࢄͤ͞Δ)

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔ - Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ (৭ʑͳ͜ͱ͕͋Δ) - ৭ʑͳཧ༝ͰৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ - ৭ʑ͋ͬͯ֎෦αʔϏεʹґଘ͍ͯ͠Δ - ͳͲͳͲ

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Not slow request

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Not slow request!!!!!!

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Not slow request!!!!!! ܾͯ͠஗͍ϦΫΤετͰ͸ͳ͍͕ ϦΫΤετ͕ଟ͗ͯ͢ࡹ͖͖Εͳ͍

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Cache

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Cache ΋ͬͱߴ଎ͳετϨʔδͰ ରԠͯ͠ͳΜͱ͔͢Δ (๫ྗ)

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Cache

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Cache ͦ΋ͦ΋ωοτϫʔΫͰ ٧·ΔՄೳੑ͕͋Δ

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ৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ Server . . . Storage Cache HTTPϨΠϠͷΩϟογϡΛ࢖ͬͯ ʮฦ͞ͳ͍ʯඞཁ͕͋Δ͔΋

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔ - Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ (৭ʑͳ͜ͱ͕͋Δ) - ৭ʑͳཧ༝ͰৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ - ৭ʑ͋ͬͯ֎෦αʔϏεʹґଘ͍ͯ͠Δ - ͳͲͳͲ

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֎෦αʔϏεʹґଘ͍ͯ͠Δ Server Client Client . . . Outer Service Request (via HTTP)

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֎෦αʔϏεʹґଘ͍ͯ͠Δ Server Client Client . . . Outer Service Request (via HTTP) ֎෦αʔϏεʹ౎౓ϦΫΤετΛ ඈ͹͍ͯͯ͠͸஗͍

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֎෦αʔϏεʹґଘ͍ͯ͠Δ Server Client Client . . . Outer Service Cache

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֎෦αʔϏεʹґଘ͍ͯ͠Δ Server Client Client . . . Outer Service Cache ΩϟογϡΛ஥հ͢Δ͜ͱͰ ߴ଎ʹ݁ՌΛಘΔͱͱ΋ʹ ෆཁͳϦΫΤετΛ࡟ݮ͢Δ

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔ - Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ (৭ʑͳ͜ͱ͕͋Δ) - ৭ʑͳཧ༝ͰৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ - ৭ʑ͋ͬͯ֎෦αʔϏεʹґଘ͍ͯ͠Δ - ͳͲͳͲ

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔ - Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ (৭ʑͳ͜ͱ͕͋Δ) - ৭ʑͳཧ༝ͰৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ - ৭ʑ͋ͬͯ֎෦αʔϏεʹґଘ͍ͯ͠Δ - ͳͲͳͲ ৭ʑͳ͜ͱ͕͋Δɼ৭ʑͳ͜ͱ͕……

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ΩϟογϡΛͲͷΑ͏ͳ࣌ʹ࢖͏͔ - Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ (৭ʑͳ͜ͱ͕͋Δ) - ৭ʑͳཧ༝ͰৗيΛҳͨ͠ྔͷΞΫηε͕͋Δ - ৭ʑ͋ͬͯ֎෦αʔϏεʹґଘ͍ͯ͠Δ - ͳͲͳͲ ৭ʑͳ͜ͱ͕͋Δɼ৭ʑͳ͜ͱ͕…… ͔͠͠ຊ౰ʹΩϟογϡ͕ඞཁͳͷ͔͸ख़ߟ͢΂͖ɽޙड़

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ΩϟογϡετϨʔδ

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ΩϟογϡετϨʔδ֓؍ - memcached - memcachedϓϩτίϧΛ஻Δ஥ؒ - Redis - BerkeleyDB - mmap (!) - ΞϓϦͷϓϩηε಺ʹ࣋ͭ - ͳͲͳͲ

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ͦͷଞͷΩϟογϡϛυϧ΢ΣΞ

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Ωϟογϡϛυϧ΢ΣΞ֓؍ - Squid - Varnish - ͳͲͳͲ

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Ωϟογϡϛυϧ΢ΣΞ֓؍ - Squid - Varnish - ͳͲͳͲ HTTPϨΠϠͰͷΩϟογϡΛओʹߦ͏ܥ

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ϛυϧ΢ΣΞબఆͷ࿩͸ ࣌ؒ༨ͬͨΒ΍Γ·͢

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Ωϟογϡઓུ

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Ωϟογϡઓུ

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Ωϟογϡઓུ ͱʹ͔͘ߴ଎ʹฦ͢

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Ωϟογϡઓུ ͱʹ͔͘ߴ଎ʹฦ͢ ߴ଎ʹฦ[ͤ͞]ͳ͍Ωϟογϡ͸ແҙຯ

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Ωϟογϡઓུ ΞϓϦΛյ͞ͳ͍

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Ωϟογϡઓུ ΞϓϦΛյ͞ͳ͍ ΞϓϦΛͿͬյ͢Ωϟογϡ͸ແҙຯ

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Ωϟογϡઓུ - ߴ଎ʹฦ͢ - ΞϓϦΛͿͬյ͞ͳ͍ - ґଘίϯϙʔωϯτΛগͳ͘อͭ - লϝϞϦ - Ωϟογϡ͕ͿͬյΕͯ΋ٽ͔ͳ͍ - (ͳΔ΂ۚ͘Λ͔͚ͳ͍)

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Ωϟογϡઓུ - ߴ଎ʹฦ͢ - ΞϓϦΛͿͬյ͞ͳ͍ - ґଘίϯϙʔωϯτΛগͳ͘อͭ - লϝϞϦ - Ωϟογϡ͕ͿͬյΕͯ΋ٽ͔ͳ͍ - (ͳΔ΂ۚ͘Λ͔͚ͳ͍)

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ґଘίϯϙʔωϯτΛগͳ͘อͭ - ґଘίϯϙʔωϯτ͕૿͑Δ = ো֐఺͕૿͑Δ - ো֐఺͸গͳ͍ํ͕ྑ͍ - ҆қʹϛυϧ΢ΣΞΛ૿΍͞ͳ͍ - ʮ࢖ͬͯΈ͔͔ͨͬͨΒʯΛؾܰʹ΍Δͱ  ͲΜͲΜट͕క·Δ

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Ωϟογϡઓུ - ߴ଎ʹฦ͢ - ΞϓϦΛͿͬյ͞ͳ͍ - ґଘίϯϙʔωϯτΛগͳ͘อͭ - লϝϞϦ - Ωϟογϡ͕ͿͬյΕͯ΋ٽ͔ͳ͍ - (ͳΔ΂ۚ͘Λ͔͚ͳ͍)

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লϝϞϦ - ϝϞϦΛϞϦϞϦ৯͏ઃܭΛආ͚Δ - ࠷ॳ͸ྑ͍͔΋͠Εͳ͍͕͋Δ೔ಥવ  ো֐͕ى͖ͨΓ͢Δ - (؂ࢹ͠Ζͱ͍͏࿩Ͱ͸͋Δ͕……) - جຊతʹΩϟογϡ͢ΔΞΠςϜʹ͸  ExpireΛ෇͚Δ (= ӬଓతʹσʔλΛ࣋ͨͳ͍)

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Ωϟογϡઓུ - ߴ଎ʹฦ͢ - ΞϓϦΛͿͬյ͞ͳ͍ - ґଘίϯϙʔωϯτΛগͳ͘อͭ - লϝϞϦ - Ωϟογϡ͕ͿͬյΕͯ΋ٽ͔ͳ͍ - (ͳΔ΂ۚ͘Λ͔͚ͳ͍)

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Ωϟογϡ͕ͿͬյΕͯ΋ٽ͔ͳ͍ - Ωϟογϡ͸յΕΔ΋ͷͱͯ͠ӡ༻ͨ͠΄͏͕޾ͤ - Ωϟογϡ͕ͿͬյΕͨΒ·ͨ࡞Ε͹ྑ͍ - Let it crash - ͨͩɼͿͬյΕͨλΠϛϯάͰٸܹʹෛՙ্͕͕Δ  Α͏ͳঢ়گʹ͚ͩͳΒͳ͍Α͏޻෉͢΂͖

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Ωϟογϡઓུ - ߴ଎ʹฦ͢ - ΞϓϦΛͿͬյ͞ͳ͍ - ґଘίϯϙʔωϯτΛগͳ͘อͭ - লϝϞϦ - Ωϟογϡ͕ͿͬյΕͯ΋ٽ͔ͳ͍ - (ͳΔ΂ۚ͘Λ͔͚ͳ͍)

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ͳΔ΂ۚ͘Λ͔͚ͳ͍ - ͸͍

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Ωϟογϡύλʔϯ

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ύλʔϯʁ ʮͦΕͧΕͷύλʔϯ͸զʑͷ਎ͷ·ΘΓͰԿճ΋ى͖Δ໰୊ɺ͓ ΑͼɺͦΕͧΕͷ໰୊ʹର͢Δղ๏ͷϙΠϯτΛهड़͍ͯ͠Δɻͦ ͜Ͱզʑ͸ɺ͜ΕΒͷղ๏ΛԿສճͰ΋࢖͏͜ͱ͕Ͱ͖Δɻಉ͡໰ ୊ʹର͢Δಉ͡ղ๏ΛԿ౓΋Կ౓΋࠷ॳ͔Βߟ͑௚ͣ͞ʹࡁΉͱ͍ ͏Θ͚ͩʯ ― Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides ஶ, ຊҐా ਅҰ, ٢ా࿨थ ؂༁ σβΠϯύλʔϯɼվగ൛ ❞

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ύλʔϯԽ͢Δར఺ͱ͸ ʮύλʔϯʹ໊લΛ෇͚Δ͜ͱͰɺઃܭͷ͓͚Δ༻ޠͷޠኮΛ૿΍ ͢͜ͱʹͳΔɻͦΕʹΑͬͯߴ͍ந৅ϨϕϧͰઃܭ͢Δ͜ͱ͕Մೳ ͱͳΔɻύλʔϯʹؔ͢Δޠኮ͕૿͑Ε͹ɺಉ྅ͱٞ࿦ͨ͠Γɺจ ॻʹه࿥ͨ͠Γɺࣗ෼ࣗ਎Ͱߟ͑Λ੔ཧ͢Δͷʹ΋໾ཱͭɻઃܭʹ ؔͯ͠ݕ౼ͨ͠Γɺઃܭ্ͷτϨʔυΦϑΛਓʹ఻͑Δ͜ͱ΋༰қ ʹͳΔʯ ― Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides ஶ, ຊҐా ਅҰ, ٢ా࿨थ ؂༁ σβΠϯύλʔϯɼվగ൛ ❞

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ύλʔϯԽ͢Δར఺ͱ͸ ʮҰ౓໊લΛݺͿ͜ͱ͕Ͱ͖Ε͹ɺ͋ͳͨ͸ͦΕΛҙࣝ͠ɺͦΕΛ ࢧ഑͠ɺͦΕΛॴ༗͠ɺͦΕΛίϯτϩʔϧͰ͖ΔΑ͏ʹͳΔͷͰ ͢ʯ ― Robin Williams ஶ, ٢઒యल ༁ɹ ϊϯσβΠφʔζɾσβΠϯϒοΫ ❞

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Ωϟογϡͷύλʔϯ - Ωϟογϡʹ͍ͭͯͷύλʔϯɼΈ͍ͨͳ࿩Λ͋·Γ ฉ͔ͳ͍ - ݁Ռͱͯ͠ʮ✕✕✕͕˓˓˓Ͱ˚˚˚ʹͳΔ΍ͭͰ͢ʯ Έ͍ͨͳৄࡉͳจষͰίϛϡχέʔγϣϯ͢Δ͜ͱ  ʹͳΔ => ͨΔ͍

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Ωϟογϡͷύλʔϯ - ͱ͍͏Θ͚ͰύλʔϯͰ͢ʂʂ - উखʹ෇໊͚ͨલͳΜͰ΋͏طʹผͷ໊લ͕͋Δ͔΋

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(ݸਓతʹ) Α͘࢖͏ ύλʔϯΛ͝঺հʂ

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Brokerύλʔϯ - Ωϟογϡʹ͋ͬͨΒΩϟογϡ͔Βฦ͢ - Ωϟογϡʹແ͔ͬͨΒҰ࣍ετϨʔδʹ໰͍߹Θ ͤͯͦͷ݁ՌΛฦͭͭ͠ΩϟογϡʹೖΕΔ ϦΫΤετͯ͠…… ϦϙδτϦύλʔϯͷѥछͱݴ͑ͦ͏

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Server Client Primary Storage ii iii Cache Storage Brokerύλʔϯ i ii iii iv i. ϦΫΤετ ii. Ωϟογϡ໰͍߹Θͤ iii. ώοτͨ͠ͷͰ݁ՌΛฦ͢ iv. Ϩεϙϯε

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Server Client Primary Storage ii iii Cache Storage Brokerύλʔϯ i ii iii iv v vi i. ϦΫΤετ ii. Ωϟογϡ໰͍߹Θͤ iii. Ωϟογϡʹແ͍ͷͰ  Ұ࣍ετϨʔδ໰͍߹Θͤ iv. ݁ՌΛΩϟογϡʹೖΕΔ v. ݁ՌΛฦ͢ vi. Ϩεϙϯε

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Brokerύλʔϯ Pros - ΞΫηεස౓ͷߴ͍ίϯςϯπ͸Ωϟογϡʹ৐Γ  ௿͍ίϯςϯπ͸Ωϟογϡʹ৐Βͳ͍  লϝϞϦ - σʔλͷ੔߹ੑΛอͪ΍͍͢ (Ωϟογϡ͕৽઱) Cons - ࠷ॳʹίϯςϯπʹདྷͨਓ͕ॏ͘ͳΔ - Ωϟογϡʹ৐͍ͬͯͳ͍࣌ʹେྔʹΞΫηε͕དྷΔͱ  ෳ਺ͷϦΫΤετ͕Ұ࣍ετϨʔδʹૹΒΕΔ  Cache Thundering Herd ໰୊ (ޙड़)

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Inventoryύλʔϯ - Ωϟογϡʹ͋ͬͨΒΩϟογϡ͔Βฦ͢ - Ωϟογϡʹແ͔ͬͨΒσϑΥϧτ஋Λฦͭͭ͠ɼ ඇಉظͰҰ࣍ετϨʔδ͔Β஋Λऔ͖ͬͯͯ  Ωϟογϡ͢ΔΑ͏ʹ͢Δ ϦΫΤετͯ͠……

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Inventoryύλʔϯ Server Client Primary Storage ii iii Cache Storage i ii iii iv i. ϦΫΤετ ii. Ωϟογϡ໰͍߹Θͤ iii. ώοτͨ͠ͷͰ݁ՌΛฦ͢ iv. Ϩεϙϯε

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Inventoryύλʔϯ Server Client Primary Storage ii iii Cache Storage i ii iii iv i. ϦΫΤετ ii. Ωϟογϡ໰͍߹Θͤ iii. Ωϟογϡʹແ͍ iv. σϑΥϧτ஋Λฦ͢ (ඇಉظͰ) iv’. Ұ࣍ετϨʔδ໰͍߹Θͤ v’. ݁ՌΛΩϟογϡ iv’ v’

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Inventoryύλʔϯ Pros - Brokerύλʔϯͱ΄΅ಉ͡Pros͕͋Δ - ࠷ॳʹίϯςϯπʹདྷͨਓʹରͯ͠΋ϨεϙϯελΠϜ͕ѱԽ  ͠ͳ͍ Cons - ࠷ॳʹίϯςϯπʹདྷͨਓ͕ਖ਼͍͠ίϯςϯπΛऔΕͳ͍ - σϑΥϧτ஋ͷϋϯυϦϯάΛͲ͏͢Δ͔ - Cache Thundering Herd ໰୊ʹ͍ͭͯ΋ղܾ͍ͯ͠ͳ͍

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Warmerύλʔϯ - ͦͷίϯςϯπΛΩϟογϡʹ৐ͤΔ - ΫϥΠΞϯτ͸ͦͷΩϟογϡΛࢀর͢Δ ίϯςϯπੜ੒࣌ʹ…… ϥϯΩϯάͱ͔ʹ࢖͑Δ

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Warmerύλʔϯ Server Client Cache Storage i ii iii iv contents contents v i. ίϯςϯπੜ੒࣌ʹ  ίϯςϯπΛΩϟογϡ ii. ϦΫΤετ iii. Ωϟογϡ໰͍߹Θͤ iv. ίϯςϯπฦ͢ v. Ϩεϙϯε

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Warmerύλʔϯ Pros - ࠷ॳ͔ΒΩϟογϡܦ༝ͰίϯςϯπΛฦͤΔ - Cache Thundering Herd ໰୊ͷҰղܾ Cons - ίϯςϯπ͕ੜ੒͞ΕΔܥ͡Όͳ͍ͱ࢖͑ͳ͍ - ϥΠϑαΠΫϧͷ؅ཧ͕൥ࡶʹͳΔ (ಉظͱ͔) - ϝϞϦΊͬͪΌ৯͏৔߹͕͋Δ - Ωϟογϡ͕شൃͨ࣌͠ʹͲ͏͢Δͷ͔ʁ

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Pool & Flushύλʔϯ POSTϦΫΤετܥʹ࢖͏ɽ ϦΫΤετ͕དྷͨ࣌ʹΩϟογϡʹͦͷ಺༰ΛཷΊɼ ͋ΔλΠϛϯάͰӬଓετϨʔδʹॻ͖ग़͢

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Pool & Flushύλʔϯ Server Client Primary Storage ii iii Cache Storage i ii iii i. ϦΫΤετ ii. ΩϟογϡʹཷΊΔ iii. Ϩεϙϯε (͋ΔλΠϛϯάͰ) x. ӬଓετϨʔδʹॻ͖ग़͠ x

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Pool & Flushύλʔϯ Pros - ߴ଎ʹߋ৽ܥΛॲཧͰ͖Δ Cons - ϓʔϧ͕ͿͬյΕͨ࣌ʹσʔλ͕ফ໓͢Δ - σʔλͷҰ؏ੑΛอͭ࿑ྗ͕͔͔Δ

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ΫϥΠΞϯταΠυΩϟογϡ

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HTTP HeaderΛ༻͍ͨΩϟογϡ Server Client i ii i. ϦΫΤετ ii. ϔομ෇͚ͯฦ͢ - Expires - Cache-Control - Last-Modified - ETag contents

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HTTP HeaderΛ༻͍ͨΩϟογϡ Server Client i ii i. ৚݅ͷϔομ෇͚ͯ  ϦΫΤετ - If-Modified-Since - If-None-Match ii. ৚݅ʹैͬͯฦ͢ contents contents

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HTTP HeaderΛ༻͍ͨΩϟογϡ Server Client i ii i. ৚݅ͷϔομ෇͚ͯ  ϦΫΤετ - If-Modified-Since - If-None-Match ii. ৚݅ʹैͬͯฦ͢ contents contents ແବʹίϯςϯπΛฦ͢ඞཁ͕ແ͘ͳΔ

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ϩʔΧϧͷ؀ڥ಺Ͱ׬݁ͤ͞Δ - ΋͸΍ΩϟογϡͲ͜ΖͰ͸ͳ͍ - ྫ: - ӾཡཤྺΛΫϥΠΞϯτͰ࣋ͬͯ΋Β͏ - λΠϜϥΠϯ࣮૷ΛΫϥΠΞϯτͷετϨʔδʹ ࣋ͬͯ΋Β͏

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αʔό͔Βฦ͞ͳ͍ͷ͕ ݁ہ͍ͪ͹Μʂʂʂ

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Ωϟογϡʹ·ͭΘΔॾ໰୊

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Cache Thundering Herd ௨ৗɺΩϟογϡʹ֨ೲ͞ΕΔσʔλ͸ɺͦΕͧΕ୯Ұͷੜଘ࣌ؒ Λ΋͍ͬͯ·͢ɻ໰୊͸ɺසൟʹΞΫηε͞ΕΔΩϟογϡσʔλ ͕ΤΫεύΠΞͨ͠ࡍʹൃੜ͠·͢ɻσʔλ͕ΤΫεύΠϠͨ͠ॠؒ ͔Βɺฒߦʹ૸Δෳ਺ͷΞϓϦέʔγϣϯϩδοΫ͕ϛεώοτΛ ݕ஌͠ɺ͍ͣΕ͔ͷϓϩηε͕ΩϟογϡσʔλΛ֨ೲ͢Δ·Ͱͷ ؒɺಉҰͷϦΫΤετ͕ଟ਺ɺόοΫΤϯυʹඈΜͰ͠·͏ͷͰ͢ɻ ―ΩϟογϡγεςϜͷ Thundering Herd ໰୊ (Kazuho@Cybozu Labs) http://labs.cybozu.co.jp/blog/kazuho/archives/2007/09/cache_and_thundering_herd.php ❞

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Cache Thundering Herd - ΤϯτϦ͝ͱʹExpireͷपظΛόϥ͢ͱ͔ - ಉҰ಺༰ͷΤϯτϦΛ2ॏʹ༻ҙ͓͍ͯͯ͠ɼ  ͲͪΒ͔ҰํΛૣ͘ (΋͘͠͸஗͘) Expireͤ͞Δͱ͔ ͦ͏͍͏ରࡦɾ޻෉͕ඞཁͱͳΔ

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ಉظ Ωϟογϡͷ಺༰ͱӬଓετϨʔδͷ಺༰ͷ  ಉظͲ͏͢ΔΜ͡Ό໰୊

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ಉظ - ΞϓϦέʔγϣϯ͸جຊతʹӬଓετϨʔδʹର ͯ͠ߋ৽ΛՃ͍͑ͯ͘  Ωϟογϡ͸࣮͸ݹ͍ίϯςϯπ͔΋ - ͪΌΜͱ಺༰Λಉظͤ͞Α͏ͱ͢Δͱେม - Ωϟογϡ͕ਧ͖ඈͿͱӬଓԽ͞Εͳ͍ɼ  ͳΜ͍ͯ͏໰୊΋͋Γ͑Δ

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ಉظ ORMΛ࢖ͬͯDBͱΩϟογϡΛಁաతʹѻ͏ͱ͍͏ ख๏͕͋Δʹ͸͋Δ͕஍ࠈײ

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ಉظ ࣃΛ৯͍͠͹ͬͯ΍Δ͔͠ͳ͍ͷ͔……

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ෆ۩߹ى͖ͨͱ͖ͷσόοά͕௒͠ʹ͍͘ ʮ͋Εɼ͜ΕΩϟογϡ౰ͨͬͯΔΜͰ͔͢ʯ ʮ͍΍ɼDB͔Βऔ͖ͬͯͯΔΜ͡Όͳ͍ʯ ʮͳΜ͔஋͕ͣΕͯΔΜͰ͢ΑͶʯ ʮΤοɼ͜ΕͲ͏ͳͬͯΜͩʁʯ

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ෆ۩߹ى͖ͨͱ͖ͷσόοά͕௒͠ʹ͍͘ ʮ͋Εɼ͜ΕΩϟογϡ౰ͨͬͯΔΜͰ͔͢ʯ ʮ͍΍ɼDB͔Βऔ͖ͬͯͯΔΜ͡Όͳ͍ʯ ʮͳΜ͔஋͕ͣΕͯΔΜͰ͢ΑͶʯ ʮΤοɼ͜ΕͲ͏ͳͬͯΜͩʁʯ ͋Γ͕ͪʂʂʂʂʂʂ

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ෆ۩߹ى͖ͨͱ͖ͷσόοά͕௒͠ʹ͍͘ ͜Ε͹͔ͬΓ͸΍Δ͔͠ͳ͍……

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ෆ۩߹ى͖ͨͱ͖ͷσόοά͕௒͠ʹ͍͘ օ͞Μ΋ͦΕͧΕͷmemcachedͷҝͷπʔϧ΍ RedisͷҝͷπʔϧΛ͍࣋ͬͯΔ͜ͱͰ͠ΐ͏ (͋Δ͍͸ϓϩτίϧΛ஻ΕΔΑ͏ʹਐԽ͢Δ)

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ෆ۩߹ى͖ͨͱ͖ͷσόοά͕௒͠ʹ͍͘ ͋ͱ͸ϩάΛϞϦϞϦ࢓ࠐΉΈ͍ͨͳ ݹࣜΏ͔͍͠ख๏ (஍ຯ͕ͩޮ͘)

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Ωϟογϡϛυϧ΢ΣΞ૿͑Δ໰୊ Ωϟογϡͷҝʹϛυϧ΢ΣΞ͕૿͑Δ ୯७ʹো֐ཁҼ͕૿͑Δʂʂʂʂʂ

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Ωϟογϡϛυϧ΢ΣΞ૿͑Δ໰୊ γεςϜΛ҆ఆͤ͞ΔͨΊʹಋೖͨ͠ Ωϟογϡϛυϧ΢ΣΞ͕ෆ҆ఆͳ͹͔Γʹ ҎલΑΓ΋Քಇ཰͕Լ͕ͬͯ͠·͏ͱ͍͏஍ࠈ

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Ωϟογϡϛυϧ΢ΣΞ૿͑Δ໰୊ - ΈͩΓʹϛυϧ΢ΣΞΛ૿΍͞ͳ͍ํ޲ͰؤுΔ - طଘͷίϯϙʔωϯτͰ୅༻͕Ͱ͖Δ͔΋ʁ

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Ͳ͏͍͏࣌ʹΩϟογϡΛ࢖Θͳ͍΂͖͔

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σʔλ͕ফ͑Δͱக໋తͳ৔߹ - σʔλ͕ڏۭʹফ͑ΔͱഛঈʂʂɹΈ͍ͨͳ  ͱ͜Ζʹ͸࢖͏΂͖Ͱ͸ͳ͍ - Ωϟογϡͷσʔλ͸ফ͑Δ΋ͷͱߟ͑Δ

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σʔλ͕ফ͑Δͱக໋తͳ৔߹ - σʔλ͕ڏۭʹফ͑ΔͱഛঈʂʂɹΈ͍ͨͳ  ͱ͜Ζʹ͸࢖͏΂͖Ͱ͸ͳ͍ - Ωϟογϡͷσʔλ͸ফ͑Δ΋ͷͱߟ͑Δ ͔͠͠αʔϏεӡ༻্ফ͑ͯ΋ྑ͍σʔλ ͳΜͯ΄ͱΜͲͳ͍ͧʂʂʂ

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ΩϟογϡΛ࠶ߏஙग़དྷͳ͍৔߹ - Ωϟογϡͷσʔλ͸ͿͬյΕͯ΋࠶ߏங  Ͱ͖Ε͹໰୊ͳ͍ - όονͰDB͔ΒΩϟογϡ࠶ੜ੒ͱ͔Ͱ - ٯʹݴ͏ͱΩϟογϡΛ࠶ߏஙͰ͖ͳ͍৔߹͸  ࢖͏΂͖Ͱ͸ͳ͍

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ଞʹ΋৭ʑ͋Δ…… ݁ߏΩϟογϡΛ࢖͏΂͖Ͱ͸ͳ͍Օॴ͸ ਎ۙʹᷓΕ͍ͯΔ

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Ωϟογϡ͸ຑༀ

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Ωϟογϡʹ·ͭΘΔॾ໰୊Λ͏͚ͯ ΩϟογϡϚδَ໳

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Ұ౓ΩϟογϡΛ࢖͏ͱ໭Εͳ͘ͳΔ - ҆қͳؾ࣋ͪͰΩϟογϡΛ࢖͏ͱ  ͦͷ෦෼͕͏͔ͬΓ଎͘ͳͬͯ͠·͏ - ଞͷ෦෼Ͱ΋ͦͷߴ଎͞ΛٻΊΒΕΔ  ͠ΐ͏͕ͳ͍ͷͰΩϟογϡ࢖͍·͔͢…… - Α͏ͦ͜Ωϟογϡপ΁

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Ұ౓ΩϟογϡΛ࢖͏ͱ໭Εͳ͘ͳΔ - Ωϟογϡ͸جຊతʹෳࡶͳػߏ - ೖΕΔͷ͸؆୯ɼൈ͘ͷ͕೉͍͠ - ΩϟογϡͱҰੜ෇͖߹͍֮ͬͯ͘ޛ͕͋Δ͔

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Ωϟογϡ೴ͷڪාʂʂʂ ʮͳΜ͔͜ͷ෦෼஗͍ͬ͢Ͷ͑ʯ ʮDB٧·ͬͯΜ͡ΌΜʁɹΩϟογϡ͠Α͏ͥʯ ʮOKOKʯ

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Ωϟογϡ೴ͷڪාʂʂʂ ʮͳΜ͔͜ͷ෦෼஗͍ͬ͢Ͷ͑ʯ ʮDB٧·ͬͯΜ͡ΌΜʁɹΩϟογϡ͠Α͏ͥʯ ʮOKOKʯ OKͰ͸ͳ͍ʂʂʂʂʂ

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Ωϟογϡ೴ͷڪාʂʂʂ ஗͍ʂ ෲཱͭʂʂ Ωϟογϡ͢Δʂʂʂ

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҆қͳΩϟογϡΛ ΍ΊΖʂʂʂʂ

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ͪΌΜͱઃܭΛ͢Δ

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ͪΌΜͱઃܭΛ͢Δ - ͪΌΜͱDB (σʔλϞσϧ) ͷઃܭΛ͢Δ - ΠϯσοΫεͱ͔΋ؚΊͯ - มͳΞʔΩςΫνϟΛ΍ΊΔ - ϘτϧωοΫʹͳΓ͕ͪ - ʮ౰ͨΓલͷ͜ͱΛ౰ͨΓલʹ΍Δʯ

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query ΫΤϦ (͋Δ͍͸ςʔϒϧ)Λ௚ͤʂʂʂ ద੾ʹνϡʔχϯά͞ΕͨΫΤϦʹ͸  ΩϟογϡͳͲෆཁ

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Ͳ͏΍ͬͯ΋ΫΤϦ͕஗͍ Server Client Client . . . RDBMS Slow Query Slave Slave ΩϟογϡʹཔΒͣ SlaveΛฒ΂Δ΋Α͠

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֎෦αʔϏεʹґଘ͍ͯ͠Δ Server Client Client . . . Outer Service Request (via HTTP)

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֎෦αʔϏεʹґଘ͍ͯ͠Δ Server Client Client . . . Outer Service Request (via HTTP) ֎෦αʔϏεʹґଘ͠ͳ͍ ํ๏Λߟ͑Δ

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ͪΌΜͱଌఆΛ͢Δ

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ͪΌΜͱଌఆΛ͢Δ - ΩϟογϡΛ༻͍Δ͜ͱͰຊ౰ʹޮ͍͍ͯΔͷ͔ - ෛՙ͕Լ͕͍ͬͯΔʁ - ϨεϙϯελΠϜ͕վળ͍ͯ͠Δʁ - αʔϏεͷՄ༻ੑ্͕ঢ͍ͯ͠Δʁ

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ͪΌΜͱଌఆΛ͢Δ - ΩϟογϡΛ༻͍Δ͜ͱͰຊ౰ʹޮ͍͍ͯΔͷ͔ - ෛՙ͕Լ͕͍ͬͯΔʁ - ϨεϙϯελΠϜ͕վળ͍ͯ͠Δʁ - αʔϏεͷՄ༻ੑ্͕ঢ͍ͯ͠Δʁ ΩϟογϡΛೖΕ͚ͨͩͰ  تΜͰ͍ͯ͸ବ໨

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ͪΌΜͱଌఆΛ͢Δ - ΩϟογϡΛ༻͍Δ͜ͱͰຊ౰ʹޮ͍͍ͯΔͷ͔ - େͯ͠ޮ͔͵ΩϟογϡͳΒೖΕΔ͚ͩෛ࠴

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Ωϟογϡ͸ຑༀ Ωϟογϡ͸࠷ऴฌث

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ຊ౰ʹඞཁͳ࣌ʹ͚ͩ ΩϟογϡΛ࢖͍·͠ΐ͏

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࢖Θͳͯ͘ࡁΉͷͳΒ ΩϟογϡΛ΍ΊΑ͏ʂʂ

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͕࣌ؒ͋Ε͹ͷίʔφʔ

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Varnishͷ࿩Λ͍ͯ͠·ͤΜͶʁ

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Varnishͷ࿩Λ͍ͯ͠·ͤΜͶʁ - ͢Έ·ͤΜαʔϏεͰ࢖ͬͨ͜ͱͳ͍ͷͰ  Ұ੾஻Ε·ͤΜ - ༗ӹͳ࿩͸Πϯλʔωοτ্ʹ͸ͨ͘͞Μ  ࢿྉ͕͋Γ·͢ (YAPC 2011ͷmala͞ΜͷࢿྉͳͲ) - Πϯλʔωοτʹ͸ͳΜͰ΋͋Δ

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ΩϟογϡετϨʔδબఆ

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ΩϟογϡετϨʔδબఆ - ༻్ - ෼ࢄ͢Δඞཁ͕͋Δ͔ - ৑௕Խ͢Δඞཁ͕͋Δ͔ - ࢖ͬͯΔΫϥ΢υϓϥοτϑΥʔϜͰαϙʔτ  ͍ͯ͠Δ͔Ͳ͏͔ - ετϨʔδʹৄ͍͠ਓ͕͍Ε͹ྑ͍

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ΩϟογϡετϨʔδબఆ

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ΩϟογϡετϨʔδͷ ৑௕Խߏ੒ʹ͍ͭͯ

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৑௕Խ - Redisͩͱsentinelͱ͔clusterͱ͔ - memdͷ৔߹͸ܥΛෳ਺༻ҙ͢Δͱ͔ - ࣗ෼ͰϧʔςΟϯάΛॻ͘ඞཁ͕͋Δ - ͍҃͸mcrouterͳͲ…… - ຊ౰ʹ৑௕Խ͕ඞཁͳͷ͔Ͳ͏͔Λߟ͑Δ  ඞཁ͸͋Δ