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mysql-freeze
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ichirin2501
March 10, 2018
Programming
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mysql-freeze
ichirin2501
March 10, 2018
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Transcript
MySQL freeze ͷר גࣜձࣾͯͳ id: ichirin2501 2017-08-19 Kyoto.ͳΜ͔ #3
ࣗݾհ • ݩߊ ( @ichirin2501 ) • ͯͳͷWebΦϖϨʔγϣϯΤϯδχΞ ڵຯ
ࠓճͷ͓
MySQLͷfreeze!!
࣌ʹ֬ೝग़དྷͨൣғΛྻڍ • ٸʹࢮ͵ • ࢮʹํfreeze, MySQLͷϓϩηεੜ͖ͯΔ • mysqladmin pingͳͲͷԠग़དྷΔ •
Ұ෦σʔλϕʔεͷΫΤϦ͕ฦͬͯ͜ͳ͍ • TCPͷଓཱ֬ग़དྷΔ, TCP keepaliveಈ͍ͯΔ • ΤϥʔϩάʹԿใग़ྗ͞Ε͍ͯͳ͍
͏͚Δ
͏͚ͳ͍
MySQLͷόʔδϣϯͱ͔ • MySQL-5.5.46 • mysql-server-5.5_5.5.46-0+deb7u1_amd64.deb • mysql-server-5.5_5.5.46-0+deb8u1_amd64.deb • OS: Debian
7.10(wheezy) or 8.1(jessie) • Kernel: wheezy=3.10.23, jessie=3.16.0
ڧҾʹ࠶ݱͤ͞Δ
sysbench !! (ҙ:benchmarkπʔϧ)
ߴෛՙΛ͔͚ଓ͚ͨΒ࠶ݱ͠ ͨʂʂ
sysbenchʹΑΔࡶͳݕূ݁Ռ EFCJBO EFCJBO P P Y Y
Y P P P P P x͕freeze
ϚΠφʔόʔδϣϯΛ্͛Δ 5.5.46 -> 5.5.52
ຊ൪ͰFreeze͠ͳ͘ͳͬͨ
ԿΘ͔ΒΜ͕ฏ͕๚Εͨ
࣌ա͗...
։ൃऀɿʮscript࣮ߦͯͨ͠Βfreezeͨ͠ʯ ࢲɿʮ͋ʔ͋ʔɺͳʹฉ͑͜·ͤΜʯ
MySQL-5.6.27͕Freeze
࠶ݕূ1 • աڈͷ؆қͳݕূͰfreeze͠ͳ͔ͬͨ • ಉݕূΛ࠶ߦ͕ͬͨ࠶ݱग़དྷͳ͍ • : sysbenchετϨεςετͰͳ͍
࠶ݕূ2 • ࣮ࡍʹϑϦʔζͨ͠batchεΫϦϓτͰࢼ͢ • 1ճ25࣌ؒͷbatchεΫϦϓτ • ݕূճ͕ॏͶΒΕͳ͍͕ࢼͦ͏ʂ
1ճͰݟࣄʹfreeze ͬͨͶʂʂʂʂʂ
ௐࠪ • Ҏલௐࠪͨ͠ͱ͖ʹεϧʔ͍߲͕ͯͨ͠ؾ ʹͳͬͨ • mysql-5.5.49ͷBugs FixedͷҰ෦ • InnoDB: Running
REPLACE operations on multiple connections resulted in a hang. (Bug #22530768, Bug #79185)
bug report • ʮInnodb freeze running REPLACE statementsʯhttps://bugs.mysql.com/ bug.php?id=79185 •
ಈ࡞ڥͱݱ͕ࠅࣅ͍ͯͨ͠ɻ ͰɺREPLACEΫΤϦࠓճͷfreezeࣄ݅ʹ ͓͍ͯҰൃߦ͞Ε͍ͯͳ͍
ؾʹͳͬͯίʔυΛݟʹߦ͘ • https://github.com/mysql/mysql-server/ search?q=22530768&type=Commits&utf8= %E2%9C%93 • |'o') TASपΓͷमਖ਼͡ΌΜ....REPLACEΫΤϦ ʹݶΒͳ͍ͷͰ....ෆԺ
ϚΠφʔόʔδϣϯΛ্͛Δ • 5.6.27ʹઌ΄ͲͷBugfixؚ·Ε͍ͯͳ ͍ɻͱΓ͋͑ͣ5.6.37·Ͱ্͛ͯscriptΛ࣮ߦ • ಉ༷ͷscriptΛԿ͔࣮ߦ͕ͨ͠freezeͳ͠ ࠓฏʂʂʂ
Α͘Θ͔ΒΜ͕ղܾʂʂ
ฏ͕Ұ൪
·ͱΊ • ϛυϧΣΞͷݕূेʹߦ͍·͠ΐ͏ • ͪΌΜͱετϨεςετΛ࣮ࢪ͠·͠ΐ͏ • ؾʹͳͬͨBugमਖ਼ͷίϛοτΛݟʹߦ͜͏