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Webサービスにおける キャッシュ戦略
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Yusuke Wada
July 03, 2016
Technology
34k
36
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Webサービスにおける キャッシュ戦略
YAPC::Asia Hachioji 2016 mid in Shinagawa
2016-07-03
Yusuke Wada a.k.a. yusukebe
Yusuke Wada
July 03, 2016
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Transcript
8FCαʔϏεʹ͓͚Δ Ωϟογϡઓུ :"1$"TJB)BDIJPKJNJEJO4IJOBHBXB :VTVLF8BEBBLBZVTVLFCF
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8FCΞϓϦέʔγϣϯ ϨΠϠʔͰѻ͏Ωϟογϡ ͷΛ͠·͢ʂ
ΞδΣϯμ w Ωϟογϡͷత w Ωϟογϡͷجૅ w Ωϟογϡύλʔϯ w Ωϟογϡ ΦϨΦϨ
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தؒςʔϒϧͷ༻ҙͳͲ w αʔόͷεϖοΫΞοϓ #65
Ͳʔ͠ΐͳ͍࣌ ΊΜͲ͍࣌͋͘͞ΔΑͶʙ %#ʹຊ࣭తͳσʔλͷΈೖΕ͍ͨ ͔ͭύϑΥʔϚϯεΛग़͍ͨ͠
ΩϟογϡͰ*0ΛޮԽʂ
ҙ
ޙड़͢ΔΑ͏ʹΩϟογϡʹΑΔ ղܾສೳ͡Όͳ͋͘Δ
Ωϟογϡͷجຊ
DBDIF நԽ͞ΕͨΩϟογϡετΞ
,74ΠϯλʔϑΣʔε ࠷ݶͷ
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FYQJSF
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σʔλΛอ࣋͢Δ༗ޮظݶΛ ࢦఆग़དྷΔ
Ωϟογϡύλʔϯ
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&YQJSFΛͬͨ యܕతͳύλʔϯ
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TVCHFU@OFXT@FOUSJFT\ NZTFMGTIJGU NZFOUSJFTTFMGDBDIFHFU LFZ SFUVSOFOUSJFTJGFOUSJFT FOUSJFTTFMGGFUDI@OFXT@FOUSJFT TFMGDBDIFTFU LFZ
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ϦεΫ
FYQJSF ඵ࣌ؒͷؒʹ ֎෦Ͱίϯςϯπ͕ߋ৽͞Εͯ ΞϓϦ্Ͱө͕͞Εͳ͍ ҙਤతͳΩϟογϡͷߋ৽ আ͕ඞཁʹͳͬͯ͘Δ
Ωϟογϡͷ ίϯτϩʔϧ͍͠
ΩϟογϡͷপΑ͏ͦ̇͜
ͱ͜ΖͰ
3%#.4ͷ͍߹Θͤͷ߹ ಉ͡Α͏ʹΩϟογϡग़དྷΔ ͨͩ͠ෳͷΫΤϦΛΩϟο γϡ͢Δ߹LFZͷཧੜ ͕ࡶʹͳΔ͕࣌͋Δ Ή͠Ζউखʹ &YQJSFΛͬͨ ΩϟογϡΛͯ͠Β͍͍ͨ
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LFZͷੜΛࣗಈతʹߦ͍ ͍ͭͷؒʹ͔&YQJSFϕʔεͷ ΩϟογϡΛ͢Δ ಁաΩϟογϡͷύλʔϯ
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ͳΔ͘खલͰΩϟογϡͯ͠ ޮΛ্͛Δύλʔϯ
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ྫ͑
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w ίϝϯτදࣔ෦͚ͩΩϟογϡ͠44*ͰύʔπΛ ݺͼग़͢ JODMVEFWJSUVBMSFDFOU@DPNNFOUFE@BSUJDMFT
ϑϩϯτدΓͷ Ωϟογϡมߋʹऑ͍ w ςϯϓϨʔτͷߏΛม͑ͨ࣌ w ։ൃ͕සൟʹى͜Δ߹ʹ͍ʹ͍͘ w ͦͯ͠࠶ར༻ੑʹ͍͠
ύλʔϯ͔ΒݟΔ ΩϟογϡͷϙΠϯτ
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LFZͷ໊͚Λ໌ࣔతʹΔ͔ಁաతʹߦ͏͔ʁ w ͳΔ͘ϑϩϯτدΓͰΩϟογϡͤͨ͞ํ͕ߴ w ͱ͍͑ΞϓϦέʔγϣϯͷมߋʹऑ͍
ΦϨΦϨ Ωϟογϡઓུ
#PLFUFαʔόΞϓϦͷ߹
#PLFUFεϖοΫ w ݄ϩʔϯν w ͏͙͢ສ%- J04 "OESPJE w Ϙέ
ສ݅ w ͓ສ݅ w ධՁԯ݅ w ϐʔΫ࣌SFRTTFD
σʔλετΞͱΩϟογϡͷ جຊઓུ
044ޓͷϛυϧΣΞΛ͏ w "NB[PO8FC4FSWJDFT্ʹΠϯϑϥΛߏங w ͨͩ͠044ޓͷ*'Λ࣋ͭϛυϧΣΞͷΈ༻ w "NB[PO3%4"VSPSB w NFNDBDIFE &MBTUJ$BDIF
w 3FEJT &MBTUJ$BDIF w &MBTUJDTFBSDI &MBTUJDTFBSDI4FSWJDF w खݩͰͷ࠶ݱੑΛߴΊΔͨΊ
+PJOΛͳΔ͘͠ͳ͍ w ෆมͳΦϒδΣΫτ͕ଟ͍ͷͰ+PJO͢Δίετ͕ແବ w ޙड़ w ΞϓϦέʔγϣϯʹΑΔ w 03.BQQFSϨϕϧͰ+PJO͠ʹ͘͘͢Δ w
ҙਤతͳඇਖ਼نԽΛؚΊΔ%#ઃܭ
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VQEBUF͕ແ͍ ͨ·ʹEFMFUF͕Δ
Ωϟογϡͷཻ w ԿΛΩϟογϡ͢Δ͔ʁ w ཻ͕খ͍͞Ωϟογϡର3PX୯ମ w ཻ͕େ͖͍ΩϟογϡରϥϯΩϯάͳͲҰཡ
3PXͷࢀর࣌ϋογϡͰѻ͏ w 3PXΦϒδΣΫτ͡Όͳͯ͘ϋογϡͰѻ͏ w ͦͦ8FC"1*͔ͩΒ+40/Ͱฦ͢͠ w ϋογϡͩͱΩϟογϡ͍͢͠ w ͨͩ3PXΦϒδΣΫτΛϑΣον͔ͯ͠Βϋο γϡԽ͍ͯ͠Δ
w 3PXຖʹJOqBUFϧʔϧΛΦϒδΣΫτʹҠৡ
όονΑΓࢀরใΛΩϟογϡ w ෳࡶͳόονॲཧΛݮΒ͢ํ w ࢹ͕͠ʹ͍͘ʢָͯ͠ࢹ͍ͨ͠ʣ w ෳΧςΰϦʹ·͕ͨΔϥϯΩϯάΛදࣔ w ଟͷՕॴͷϥϯΩϯάΛόονͰੜආ͚ͨ ͍ʢΊΜͲ͍͘͞ʣ
ίϯςϯπΛ༧Ί༻ҙ͢ΔͷͰͳ͘ ඞཁͱ͞Εͨ࣌ʹΩϟογϡ͓ͯ͘͠
࣮
ΦϒδΣΫτϕʔεͷ ಁաΩϟογϡ
CPLF\PEBJ^\QIPUP^\MBSHF@VSM^ ϦϨʔγϣϯઌͷΦϒδΣΫτ ΩϟογϡΛ࣮ݱ͢Δ Ωϟογϡ͔Βऔಘ
#PLFUF%# QBDLBHF#PLFUF%# VTFQBSFOU5FOH TVCGJOE@XJUI@DBDIF\ NZ TFMG UBCMF XIFSF FYQJSF
!@ NZLFZTFMGNBLF@LFZ UBCMF XIFSF GJOE NZEBUBTFMGDBDIFHFU LFZ SFUVSOEBUBJGEBUB NZPCKFDUTFMGTJOHMF UBCMF XIFSF PSSFUVSO EBUBPCKFDUJOGMBUF@DPMVNOT TFMGDBDIFTFU LFZ EBUB FYQJSF SFUVSOEBUB ^ TVCEFMFUF@DBDIF\ ಁաΩϟογϡ ΠϯλʔϑΣʔεΛੜ͢
#PLFUF%#3PX#PLF QBDLBHF#PLFUF%#3PX#PLF TVCJOGMBUF@DPMVNOT\ NZTFMGTIJGU NZEBUBTFMGDPMVNOT EBUB\PEBJ^ TFMGIBOEMFGJOE@XJUI@DBDIF
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ԾʹϦϨʔγϣϯઌͷPEBJQIPUP ͕Ωϟογϡ͞Ε͍ͯΔCPLFҰཡΛ औͬͯ͘Δ߹ 4&-&$5จҰൃͷΈͰϦϨʔγϣϯઌ ͷΦϒδΣΫτऔͬͯ͜ΕΔʂ
!CPLFTTFMGECTFBSDI CPLF \^ \PSEFS@CZ \JEBTD MJNJU^^ CPLFT<>\PEBJ^\QIPUP^\MBSHF@VSM^ .Z42-4&-&5$5 '30.CPLF03%&3#:JE"4$-*.*5
NFNDBDIFEHFUPEBJBCDEFG NFNDBDIFEHFUQIPUPBCDEFG NFNDBDIFEHFUPEBJBCDEFGH NFNDBDIFEHFUQIPUPBCDEFGH NFNDBDIFE͔ΒͷHFUͳͷͰेʹ͍ 3%#.4ͷෛՙΫΤϦҰൃͷΈ
Ωϟογϡͷഁغ w ΦϒδΣΫτͷߋ৽আ͕ͬͨ߹ͷΩϟογϡͷΫϦΞ w LFZੜ࣌ͱಉ͡Α͏ʹ03.BQQFSͷΫΤϦΛॻ͘ w ճ͕ଟ͘ແ͍ͷͰରԠͰ͖ͯΔ TFMGECEFMFUF@DBDIF PEBJ \JEPEBJ@JE^
ϥϯΩϯάͱ͔ ҰཡͷΩϟογϡ
ಁաతΩϟογϡΛ࠾༻ w ϞσϧʹDPOE BUUSΛҾͱͯ͠Β͏ϝιο υΛੜ͢ྫHFU@TPSUFE@FOUSJFT w BUUSͷϋογϡʹFYQJSFͷ͕ೖ͍ͬͯΕͦͷؒ ͚ͩΩϟογϡͤ͞ΕΔ NZTFMG
DPOE BUUS!@ TFMGECTFBSDI CPLF \^ \PSEFS@CZ\SBUF@TVN EFTD MJNJU FYQJSFBUUS\FYQJSF^^^
ΞϓϦέʔγϣϯຖͷ্༷ Ωϟογϡͯ͠Α͚Ε ׆༻Λʂ
͔͕͠͠
ͦͷ໊
5IVOEFSJOH)FSE
௨ৗɺΩϟογϡʹ֨ೲ͞ΕΔσʔλɺͦΕͧΕ୯Ұͷ ੜଘ࣌ؒΛ͍ͬͯ·͢ɻɺසൟʹΞΫηε͞ΕΔ Ωϟογϡσʔλ͕ΤΫεύΠΞͨ͠ࡍʹൃੜ͠·͢ɻσʔ λ͕ΤΫεύΠϠͨ͠ॠ͔ؒΒɺฒߦʹΔෳͷΞϓϦ έʔγϣϯϩδοΫ͕ϛεώοτΛݕ͠ɺ͍ͣΕ͔ͷϓ ϩηε͕ΩϟογϡσʔλΛ֨ೲ͢Δ·ͰͷؒɺಉҰͷϦ ΫΤετ͕ଟɺόοΫΤϯυʹඈΜͰ͠·͏ͷͰ͢ɻ IUUQMBCTDZCP[VDPKQCMPHLB[VIPBSDIJWFTDBDIF@BOE@UIVOEFSJOH@IFSEQIQ
ਤղ
FYQJSF ेʹ͍ ेʹ͍ FYQJSFͨ͠ॠؒ ίϯςϯπͷੜ ΩϟογϡͷTFU ͜ͷظؒʹΞΫηε͕ू தͯ͠ίϯςϯπੜ͕ ଟॏʹΔ
Cache Thundering Herd Problem
%#ͷ$16ෛՙ
٧Ή
٧Ή
٧Ή
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ղܾࡦ
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Έ w ௨ৗͷΩϟογϡ &YQJSF͕͍Ωϟογϡ w ্ه̎ͭΛNFNDBDIFEʹTFU w HFU࣌ʹͱ͋Δ֬Ͱ&YQJSF͕͍ํͷΩϟογϡ Λݟʹ͍͘ w
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͜ͷΑ͏ʹΞϓϦʹΑͬͯ Ωϟογϡઓུ༷ʑʂ
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Ωϟογϡઓུʹ͍ͭͯ͠·ͨ͠ w ΩϟογϡͷతجຊతͳΈ w ಁաΩϟογϡͷ࣮ͱϦεΫ w ΦϨΦϨ Ωϟογϡઓུ w
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