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ISUCON6本選の裏話 @ ISUCON6裏話Night
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Atsushi Takayama
November 23, 2016
Technology
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ISUCON6本選の裏話 @ ISUCON6裏話Night
Atsushi Takayama
November 23, 2016
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Transcript
ISUCON6ຊબͷཪ ISUCON6ཪNight ߴࢁԹ @edvakf
ߨධطʹISUCONެࣜϒϩάͷ΄͏ʹدߘͨ͠ͷ Ͱɺࠓཪతͳ͜ͱΛ͠·͢
ࣗݾհ ߴࢁԹ @edvakf pixivίϛοΫͱ͍͏αʔϏεͷٕज़ऀͱ ձࣾͷΤϯδχΞશһʹؔΘΔΑ͏ͳΈͮ͘Γ͕ओͳ ͓ࣄ ϓϩάϥϛϯάݴޠ JavaScript, PHP, Ruby,
Go, Scala ͕ कඋൣғͰ͢ 12݄͔ΒCTOʹब͢Δ͜ͱʹͳΓ·ͨ͠
ISUCONͱࣗ ISUCON3͔Βࢀઓ ISUCON5·Ͱຖճຊઓग़ ISUCON4Ͱ2Ґ
ISUCONग़ͷܦҢ ڈͷISUCONͷ࠙ձϞϦεφΠτͰ941͞Μʹ͓ ༠͍Λड͚ͯ ͯͳ͞ΜͱϐΫγϒͰ༧બɾຊબͷͲͪΒΛ୲͢ Δ͔ɺͱ͍͏Λࣾͷڠྗऀͱ͠߹͍ɺ ͷύλʔϯΛͦΕͧΕߟ͓͍͑ͯͨ 12݄ʹSongmu͞ΜʹʮͲ͕ͬͪຊબΓ·͠ΐ͏͔ Ͷʁʯͱฉ͍ͨΒ
–Songmu “ͦΓΌ͏ϐΫγϒ͞ΜͰ”
ୈҰষ ͓ΘΓ
ୈೋষ ࣾISUCON
༧બͱຊઓ ༧બʮ͜ΕͧISUCONʯͱ͍͏ ຊબҙ֎ੑͷ͋Δ ͱ͍͏ڞ௨ೝ͕ࣝͳΜͱͳ͋͘Δ ʮ͜ΕͧISUCONʯͱ͍͏Λ࡞Βͣʹ͍͖ͳΓຊબ Λग़͢Δͷϋʔυϧ͕ߴ͍ →Α͠ɺࣾISUCONΖ͏
ࣾISUCONͷ͢ʍΊ ৽ଔݚमͷ࠷ऴʹ࣮ࢪ ISUCON༧બʹ͋Γͦ͏ͳΛఆͯ͠ɺ৽ଔ͚ͷڭҭత ༰ΛΓࠐΜͰ࡞ ࣾISUCONΛެ։ͨ͠Β͘ΘΕͨ http://inside.pixiv.net/entry/2016/09/26/130112 ࢀߟ࣮ΛҰ௨Γ࡞ͬͨΓηοτΞοϓํ๏ͳͲΛ͔ͬ͠ Γެ։ͨ͠ߕ൹͕͋ͬͨ
ࣾISUCONͷڭ܇
ॳظσʔλΛૣ͍ஈ֊Ͱ࡞͓ͬͯ͘ͱḿΔ ࢀߟ࣮Λ࡞Γͳ͕ΒϕϯνϚʔΧʔΛฒߦͯ͠ਐΊΒΕ Δ ࢀߟ࣮ͷҠ২͕ϥΫʹͳΔ E2Eςετ͋Δͱࢀߟ࣮͕ඇৗʹḿΔ ࣾISUCONͰNightmare.jsͰ࡞ ຊબͰϕϯνϚʔΧʔͷॳظνΣοΫΛE2Eςετ ΘΓʹͨ͠
ΞϓϦέʔγϣϯͷҠ২ίετͷ΄ͱΜͲςϯϓ ϨʔτͷҠ২… JSON͔͠ѻΘͳ͚Ε2͋Εे ຊબͰHandlebarsͷΑ͏ͳݴޠඇґଘͷςϯϓ ϨʔτΤϯδϯΛ͓͏ͱܾ৺ ReactͷαʔόʔαΠυϨϯμϦϯάΛࣾͰ ͍ͬͯͨͷͰ࠾༻
ϕϯνϚʔΧʔͲΕ͚ͩ࣌ؒΛͬͯνΣοΫ Λᘳʹ͢Δ͜ͱෆՄೳ Ͳ͔͜Ͱଥڠ͠ͳ͚Ε͍͚ͳ͍ ϕϯνϚʔΧʔ͕ڐ͢ݶΓԿͬͯOKͱ͍͏Ϩ ΪϡϨʔγϣϯʹͤ͟ΔΛಘͳ͍
ϓϩϏδϣχϯάͷඋʹҙ֎ͱ͕͔͔࣌ؒΔ ΞϓϦέʔγϣϯɺϕϯνϚʔΧʔɺϙʔλϧαΠτ ຊબdocker-composeͰϥΫΛ͠Α͏ͱܾΊͨ ϕϯνϚʔΧʔʢෳʣͱϙʔλϧαΠτͷ௨৴ΛͲ ͏ઃܭ͢Δ͔ શ෦ͷίϯϙʔωϯτ͕͋Δఔ͢Δ·Ͱ์ஔ͕͠ ͕ͪͩɺૣΊʹ͓͖͍ͬͯͨͱ͜Ζ ݁ہຊબͰΪϦΪϦʹͳͬͯ͠·ͬͨͷল
ग़ऀ͕༻ҙ͢Δͷඇৗʹଟ͍ ࢀߟ࣮ ϕϯνϚʔΧʔ ϙʔλϧαΠτ ຊ൪ڥͷϓϩϏδϣχϯά ϨΪϡϨʔγϣϯ Φʔϓχϯάಈը
Ҏ্Λ౿·͑ͯɺ 5݄ࠒʹͷςʔϚΛվΊܾͯఆ
ʮ2016ͷISUCONͱ ͜͏͋Δ͖ʯ
Docker ReactαʔόʔαΠυϨϯμϦϯά ΞϓϦέʔγϣϯJSON͔͠ѻΘͳ͍ ϦΞϧλΠϜ௨৴ C10K Server-Sent Events HTTPSલఏ HTTP/2ʹ͢Δͱ͍͍͜ͱ͋Δ͔ʁ
ୈࡾষ ຊબͱpixiv
ຊબͷ͓͞Β͍ ࠷ॳʹϖʔδΛදࣔ͢Δ ͢Δͱ͖ɺNodeJSͰϨ ϯμϦϯά͞ΕͨHTMLΛ ϩʔυ͢Δ ͦΕҎ߱APIͱΓ ͱΓ
pixiv Sketch
ຊબͷϞσϧ Web൛ReactͷϑϩϯτΤϯυͰαʔόʔαΠυϨ ϯμϦϯά όοΫΤϯυAPIRails ಉ͡APIΛεϚϗΞϓϦ͔Β͏ NodeJSͷϑϩϯτΤϯυεϚϗΞϓϦͳͲͱಉ ͡Α͏ͳ1ͭͷΫϥΠΞϯτɺͱ͍͏Ґஔ͚ͮ
AIʹഃ͞ΕΔ12ؒ ʰഃগঁʱ
WebSocketαʔόʔ ࠓͷ8݄ͱ9݄ʹظؒݶఆاըͰߏங αʔόʔJava (Spark) ࠷େ1ສਓఔ͕ಉ࣌ར༻ ͜͜Ͱಘͨಉ࣌ଓ·ΘΓͷϊϋΛຊબ ʹϑΟʔυόοΫ
ୈ࢛ষ ίωΫγϣϯΛେྔʹுΔ
C10KʙC100K 1ͭͷαʔόʔͰTCPίωΫγϣϯΛେྔʹड͚͚ΔͨΊʹ ɺΧʔωϧύϥϝʔλΛదʹ͢Δඞཁ͕͋Δ net.ipv4.tcp_max_orphans, net.core.somaxconn, net.ipv4.ip_local_port_range, fs.file-max ͦΕͱผʹɺ1ͭͷΫϥΠΞϯτ1ͭͷαʔόʔʹର͠ɺ 65535ίωΫγϣϯ·Ͱ͔͠ಉ࣌ଓͰ͖ͳ͍ ͭ·Γɺ100KίωΫγϣϯΛ͚͑ͨΕෳͷαʔόʔ
͔ΒϕϯνϚʔΫΛ͔͚ͳ͚Ε͍͚ͳ͍
ϘπҊ1 Azure FunctionsͰαʔόʔϨεࢄϕϯνϚʔΧʔ ಉ͡Function͕Ұʹ6ݸ͔࣮͠ߦͰ͖ͳ͍ʢଞ ͨ͞ΕΔʣΛղܾͰ͖ͳ͔ͬͨͷͰෆ࠾༻ HTTPΤϯυϙΠϯτΛॻ্͘ͰAWS LambdaΑΓ γϯϓϧͰྑ͍ Dropbox͔ΒσϓϩΠͰ͖Δศརػೳʢʁʣ
ϘπҊ2 ϕϯνϚʔΧʔ͕ผͷαʔόʔͷࢠϕϯνϚʔΧʔ Λ࣮ߦ͠ɺࢠϕϯνϚʔΧʔ͕ड͚औͬͨϩάΛ ϕϯνϚʔΧʔ͕ूܭ͢Δ ϕϯνϚʔΧʔ͕ෳࡶʹͳΓ͗ͯ͢༧ظ͠ͳ͍ͱ͜ ΖͰࣦഊ͢Δ͕֬૿͑ΔͷͰ٫Լ
࠾༻Ҋ nginxͷstreamϞδϡʔϧͰL4ϑΥϫʔυϓϩΩγ HTTPSͳͷͰTCPϨϕϧͰϓϩΩγ ͜ͷޙ@catatsuy͕ৄ͘͠͠·͢
ෛՙΛ͔͚Δ ࠷ॳʹNຊͷίωΫγϣϯΛுΔ 5ඵޙʹ৽ͨʹ N - (a + b) ຊͷଓΛࢼΈΔ a:
·ཱͩ֬͞Ε͍ͯͳ͍ίωΫγϣϯ b: طʹஅࡁΈͷίωΫγϣϯ N = N + N - (a + b) ͱ͢Δ ҎԼϧʔϓ ʢ͜Εͩͱݱࡏཱ͍֬ͯ͠ΔίωΫγϣϯͱಉ͡ͷίωΫγϣϯΛ5ඵ ͝ͱʹషΖ͏ͱͯ͠ɺͲΕ͚ͩ࠷దԽͯ͠Too many connections͕ग़Δͱ ຊબޙʹࢦఠ͞Εͨʣ
ୈޒষ ϕϯνϚʔΧʔΛ2ճ࡞ͬͨ
͜Ε·ͰͷϕϯνϚʔΧʔ ISUCON4: Go, ISUCON5: Java ͍ͣΕ࠶ར༻Λߟ͑ΒΕ͍ͯͨΑ͏Ͱ͕͢ɺϑϧεΫϥονͨ͘͠ ͳΔͷ͕ϓϩάϥϚʔͷਓ ISUCON6: Go ࣾISUCONͷͱ͖ʹcatatsuy͕࡞ͬͨͷ͕ϕʔε
ISUCON6༧બ͜ͷ࣮Λ౿ऻ͍ͯͨ͠ ࣾISUCONͷϕϯνϚʔΧʔ͚ͬ͜͏ྑ͔͕ͬͨɺ͍͔ͭ͘ؾʹ ೖΒͳ͍ͱ͜Ζ͕͋ͬͨͷͰɺ࣮ຊબʹ͚ͯ·ͨ࠶࣮ͨ͠
ڈʹ฿ͬͨ͜ͱ ॳظνΣοΫͰΤϥʔʹͳΕͦΕҎ্࣮ߦ͠ͳ͍ ͜ΕʹΑΓΩϡʔ͕٧·Δ͜ͱΛ͋Δఔආ͚ΒΕΔ ιϑτλΠϜΞτͱϋʔυλΠϜΞτ ιϑτλΠϜΞτ: ϕϯνϚʔΧʔͷϓϩηε͕ࣗͰऴྃ͢Δ͖࣌ؒ ϋʔυλΠϜΞτ: ͦΕΑΓ͋Δఔ͍࣮࣌ؒߦ͞Ε͍ͯΔͱɺϕϯν ϚʔΧʔΛىಈ͢Δϓϩηε͕ҟৗͱஅͯ͠ϕϯνϚʔΧʔϓϩηεΛ ࡴ͢
workloadύϥϝʔλͳ͠
৽͍͠ཁૉ Ճ͋ͬͯݮͳ͍ ࣾISUCONͰΤϥʔͰݮ্ͨ͠Ͱɺ0ҎԼ0ʹΓ্͍͛ͯͨ ͜ΕͩͱࠓͲΕ͚ͩϚΠφεͳͷ͔͕͔Βͳͯ͘ํཱ͕ͯʹ͍͘ Τϥʔ͕ग़ͨΒϕϯνϚʔΧʔͷฒྻΛԼ͛Δ ॳظ࣮ͱ࠷దԽ͞Ε࣮ͨͷ྆ํͰͳ͘ಈ͘ϕϯνϚʔΧʔΛࢦ ͨ͠ ʢ͕ɺ࠷దԽ͢Δͱεϧʔϓοτ্͕͕ͬͯٯʹΤϥʔ͕૿͑Δɺͱ͍͏ έʔε͕͋Δͱͷࢦఠʣ
ϕϯνϚʔΧʔͷ։ൃ ϕϯνϚʔΧʔಠཱͨ͠ίϚϯυͱ࣮ͯ͠ߦͰ͖Δͱ ։ൃ͕ϥΫ ඪ४ग़ྗʹείΞϝοηʔδͷೖͬͨJSONΛग़͢ ࣮ߦதͷϩάͳͲඪ४Τϥʔग़ྗʹग़͢͜ͱͰɺ࣮ߦ ऴྃΛͨͳ༷ͯ͘ࢠ͕Θ͔ΔͷͰḿΔ ࣾISUCONͷͱ͖͜Ε͕ແ͔ͬͨͷͰਏ͔ͬͨ
GoͰϕϯνϚʔΧʔΛॻ͘ ʢҰॠVert.xΛࢼ͕ͨ͠ɺJavaಛ༗ͷSSLূ໌ॻͷѻ͍ʹϋϚͬͯ ࠳ંʣ GoͩͱIOॲཧผεϨουॲཧΛߦ͏ͨͼʹϓϩάϥϜΛෳࡶʹ ͠ͳͯ͘ྑ͍ͷͰγφϦΦ্͕͔ΒԼʹҰઢʹॻ͚Δ γφϦΦ͝ͱʹฒྻΛࢦఆ͢Δॲཧ͕εοΩϦॻ͚ͨͷͰؾʹ ೖ͍ͬͯΔʢ࣍ͷϖʔδʣ ຊબͰγφϦΦ͝ͱʹཧ্ͷ࠷େεϧʔϓοτΛઃఆͯ͠ ͍ͨ
ch1 := makeChan(10) ch2 := makeChan(2) timeoutCh := time.After(60* time.Second)
L: for { select { case <-ch1: go func() { scenario.LoadIndexPage(origins) time.Sleep(500 * time.Millisecond) ch1 <- struct{}{} }() case <-ch2: go func() { scenario.DrawOnRandomRoom(origins) time.Sleep(500 * time.Millisecond) ch2 <- struct{}{} }() case <-timeoutCh: break L } }
ୈࣣষ ϙʔλϧαΠτ
༧બͷϙʔλϧαΠτΛϑΥʔΫ ༧બͷॳʹώϚͩͬͨͷͰɺάϥϑΛ࣮͕ͨ͠ɺॳͱ2 ͰڍಈΛม͑ͳ͍΄͏͕͍͍ͩΖ͏ͱ͍͏͜ͱͰ͓ଂೖΓʹ ͞ΒʹϩάΠϯ͍ͯ͠ͳ͍ਓʹάϥϑΛݟΒΕΔΑ͏ʹͨ͠ ্ͰຊબͷϙʔλϧαΠτͱͨ͠ ෦ͷσʔλߏେϦϑΝΫλϦϯά ϕϯνϚʔΧʔͷඪ४Τϥʔग़ྗΛ֨ೲ͢ΔΧϥϜΛ࡞ͬͯ ཧը໘ͰݟΒΕΔΑ͏ʹͨ͠Γ ڝٕऀ͚ϝοηʔδΛཧը໘͔Βग़ͤΔΑ͏ʹͨ͠Γ
ୈീষ ຊ൪ڥͷ
ਖ਼ɺຊ൪ڥ·ΘΓ matsuu͞Μʹ͖ͤͬΓͰ͕ͨ͠ɺ Ұͭݴ͑Δ͜ͱ
ෳߏͰ͋Δ ඞવੑ͕ແ͍
Ϋϥυͩͱ8ίΞx1ͱ2ίΞx4ͷஈ͕ಉ͡ ISUCONͷΑ͏ͳظͰύϑΥʔϚϯεΛग़͞ͳ͍ͱ ͍͚ͳ͍ڥʹ͓͍ͯɺෳߏΛબ͢Δཧ༝ ͕ແ͍ ຊબͰΦʔϓχϯάεϥΠυʹϦΞϦςΟΛ࣋ͨͤ ΔͨΊʹɺʮ߹ܭίΞ੍ݶΛ૿͢·Ͱͷਏ๊ͩʯ ͱ͍͏͍ۤ͠ઃఆʹ͕ͨ͠… ࠓޙͲ͏͢Δ͖ͳͷ͔
࠷ऴষ ग़ऴΘͬͯΈͯ
৭ʑߟ͑ͯࢼߦࡨޡ͠·͕ͨ͠ɺຊબʹΓࠐΊͨͷ͘͝Ұ෦ 1ؒ୭ʹݴ͑ͳ͍ͷ͕͍ۤ͠ͱ͜Ζ ৭Μͳօ͞Μʹॿ͚ΒΕͯग़Ͱ͖·ͨ͠ ͜ͷ͙Β͍ͷਓͰӡӦ͠ͳ͚Ε৺͕ંΕ͍͔ͯͨ… ࠷ऴతʹશ෦ࣗͰΓͨ͘ͳͬͯ͠·͏ѱ͍บ͕w ᘳΛࢦͤͲΕ͚ͩͰΔ͜ͱ͕͋ΔͷͰɺ͍࣌ؒ͘Β͋ͬ ͯΓͳ͍ ৭ʑ٧ΊࠐΈ͍ͨཉɺείΞʹ͕ࠩग़ͳ͍Μ͡Όͳ͍͔ͱ͍͏ڪා Λ੍͢Δͷ͕ͱ͍ͯ͠