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ো֐ʹͯ͢Δͱ͜Ζͳ͠ αΠϘ΢ζגࣜձࣾ @yokotaso

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We’re sorry for …

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ӡ༻ো֐ͷ࿩ • ͝໎࿭Λ͓͔͚ͨ͠Έͳ͞· ͝ΊΜͳ͍͞ • ؂ࢹɾରࡦɾௐࠪɾվળΛ೔ʑੋվળ • վળ͸·ͩ·ͩಓ൒͹ • αΠϘ΢ζΛ຤Ӭ͘ΑΖ͓͘͠ئ͍͠·͢

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Ϋϥ΢υͷن໛ͱՔಇ཰ • ͝ܖ໿͍͍͍ͨͩͯΔձ༷ࣾ ໿1ສ8ઍࣾ

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ӡ༻ো֐

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Boo!

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ͦΜͳ͜ͱͳ͍

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ŧŔŕŪGOOD

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ࣦഊ͔ΒపఈతʹֶͿ ো֐ֶश 4

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جૅ஌ࣝΛ͚ͭΔ

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جૅతͳૉཆΛຏ͘ ίϯϐϡʔλͷجૅΛ஌Ζ͏

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ੜ͖ͨσʔλ͕ো֐ʹ͸͋Δ • ϘτϧωοΫ͸Ͳ͜ʁ • େن໛αʔϏεٕज़ೖ໳Λ
 ࢀর͠ͳ͕Βௐࠪ͢ΔͱษڧʹͳΔ • ϝτϦΫε؂ࢹπʔϧͰ؍࡯͠Α͏ • جૅతͳ஌ࣝ΍ಎ࡯͕
 ো֐ௐࠪͷͨͼʹຏ͔ΕΔ

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஌ࣝͱܦݧ͸ཌྷΛत͚ͯ͘ΕΔ • ະ஌ͷ໰୊ʹग़ձͬͨΒཱͪฦΔ৔ॴ • ೉͍͠໰୊΄Ͳղܾͷࢳޱʹ • ҰਓͰௐࠪΛਐΊΒΕΔΑ͏ʹͳͬͨ • ϝτϦΫε͔ΒݪҼΛ༧૝Ͱ͖ΔΑ͏ʹ

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ίϯϐϡʔλʔͷେࣄͳࣄ͸ ো֐͕ڭ͑ͯ͘Εͨ

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஌ࣝΛਂ۷Γ͢Δ

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ಈ࡞ݪཧΛਂ͘ཧղ͢Δ ো֐͸࠷ߴͷྑ໰Ͱ͋Δ

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MySQLͷΠϯσοΫε͕࢖͑ͳ͍࿩

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খ͞ͳෆ۩߹վम͕ݪҼ • ॏෳআڈͷͨΊʹGROUP BY Λ҆қʹ͚ͭͨͷ͕ݪҼ • JOIN࣌ʹར༻ͨ͠ΠϯσοΫε͕GROUP BY ʹ࠶ར༻Ͱ͖ͳ͍ • େྔͷϨίʔυʹରͯ͠filesort͕૸ͬͯྦ໨

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ཧղͨͭ͠΋Γʹͳͬͯ·ͤΜ͔ • ো֐ͷͨͼʹجຊతͳಈ࡞ݪཧΛ֬ೝ • ো֐ௐࠪΛ௨ͯ͠ಈ࡞ݪཧͷཧղ͕ਂ·Δ • ಈ࡞ݪཧ͕ਂ͘ཧղͰ͖͍ͯͳ͍ؾ͖ͮ

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ো֐͸࠷ߴͷྑ໰Ͱ͋Δ

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νʔϜͰڧ͘ͳΔ

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ࣦഊΛΏΔ͢จԽ ࣦഊͷڞ༗͸ஏ͕ͩ໾ʹཱͭʂ

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Seasar2 S2DAO Ҡߦࣦഊ

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͝ΊΜͳ͍͞!͝ΊΜͳ͍͞! • SeasarͷEOLʹ൐͏Spring FrameworkҠߦ • Seasar S2DAO͔ΒHibernateͷ΁Ҡߦࣦഊ • ύϑΥʔϚϯεྼԽɺOutOfMemoryError… • ׬શഊ๺Ͱ͢ɻ͝໎࿭Λ͓͔͚͠·ͨ͠

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ࣦഊΛड͚ೖΕΔจԽ

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PostmortemΛॻ͜͏ • ໰୊Λ٬؍తʹ੔ཧ͢ΔͨΊʹ༗༻ • ࣦഊΛ෼ੳɾڞ༗ɾ๷ࢭ • AWS S3 େن໛ো֐ • git lab ຊ൪σʔλ࡟আ

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ࣦഊΛڞ༗Ͱ͖ΔจԽΛ࡞Δ • ࣦഊΛڞ༗ͯ͠܁Γฦ͞ͳ͍จԽΛ࡞Ζ͏ • ࣦഊʹ͍ͭͯޠΔਓͷଘࡏҙٛ͸େ͖͍ • ࣦഊΛڞ༗ͯ͘͠ΕΔਓʹѹ౗తײँ • ݠڏɾଚܟɾ৴པ(HRT) ΛԿ౓΋֬ೝ͠Α͏ • ݸਓͷࣦഊͰ͸ͳ͍ɺ૊৫ͷࣦഊͩ

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ࣦഊ͸੒ޭͷதؒ఺Ͱ͔͠ͳ͍

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సΜͰ΋ͨͩͰ͸ى͖͕͋Βͳ͍ʂ • ࣦഊͷչ͕͠͞վળʹͭͳ͕Δ • S2Dao͔ΒHibernate΁ͷҠߦࣦഊΛ׆͔ͯ͠ • JDBCTemplateΛར༻ͯ͠࠶ઃܭ • OSSͱͯ͠ެ։༧ఆ

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ࣦഊͷڞ༗͸ஏ͕ͩ໾ʹཱͭʂ

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Α͜͠·ͳੜ͖ํ

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ͣͿͱ͘ੜ͖Δ ੜ͖͍ͯΔ͚ͩͰ·Δ΋͏͚

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Java ṖͷύϑΥʔϚϯεྼԽ

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ղܾ͠·ͨ͠ (๑•̀ŷ•́)و✧ • JIT Compiler͕ఀࢭ͢Δέʔε͕͋Δ • JVM͕JIT Compileͨ͠ίʔυΛࣺͯΔ • JIT Compiler͕෮ؼͤͣɺ࠷దԽͷ͔͔Βͳ͍
 Byte CodeΛJava͕࣮ߦ͠ଓ͚Δ • ύϑΥʔϚϯεྼԽΛى͜͢

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ղܾͷࢳޱ • GCʹׂΓ౰ͯΔThread਺͸
 CPU਺͔Βܾ·Δ • GCʹׂΓ౰ͯΒΕͨThread͸
 CPUΛ100%ઐ༗͢Δ

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ղܾͷࢳޱ • GCʹΑΔCPUར༻཰Λߟྀͯ͠΋༨༟͕͋Δ • Full GC͸ൃੜ͍ͯ͠ͳ͍ • GCΛݪҼ͔Βഉআ • CPUෛՙ্͕͕ΔέʔεΛMLͰಡΈ͋͞Δ

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ϒϩάʹެ։

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͝Ѫಡ͋Γ͕ͱ͏͍͟͝·͢ʂ • ͜ͷهࣄ͚ͩͰ 1ສ5ઍPV • ࠷ऴతʹ 700͸ͯϒ͘Β͍ • OSS͸͓ੈ࿩ʹͳΓͬͺͳ͠ • ৘ใެ։Ͱߩݙ͍ͨ͠ؾ࣋ͪ

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ͣͿͱ͘ੜ͖ΔΑ͏ʹ • ໘ന͍ٕज़هࣄʹͳͬͨΒṶ͚΋ͷ • ໘ന͍ࣄ͋ͬͨΒ͍͍ͳ͕ϞνϕʔγϣϯʹมԽ • ࠶ىಈͰճආͭͭ͠௕ظؒɺো֐͕ൃੜ͍ͯͨ͠ • Θ͔Βͳͯ͘΋͍͍ɾಀ͍͍͛ͯ • ੜ͖͍ͯΔ͚ͩͰ·Δ΋͏͚ͷਫ਼ਆ

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ௐ΂Δ͚ͩͰ·Δ΋͏͚ʂ

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ো֐ֶशɺ͸͔ͲΓ·͔ͬ

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ো֐ʹͯ͢Δͱ͜Ζͳ͠