Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
ハマったところ 表参道.rb #44 / into a problem
Search
Keiji Matsuzaki
March 07, 2019
Technology
0
920
ハマったところ 表参道.rb #44 / into a problem
Railsアプリ運用時にハマったときの体験です
Keiji Matsuzaki
March 07, 2019
Tweet
Share
More Decks by Keiji Matsuzaki
See All by Keiji Matsuzaki
note engineer meetup #3 インフラの現状 / note engineer meetup #3 infra
futoase
4
1k
note meetup #2 Electronを利用した10面ディスプレイの操作 / Controll of gaienmae display
futoase
0
600
mastodon
futoase
0
96
susumekata
futoase
1
640
freee-wacul-web-app-lt-one
futoase
0
1.8k
Engineer All Hands #5 (freee) 「インフラ」
futoase
0
470
soracom-go
futoase
0
330
AWS Summit Tokyo 2015 freee
futoase
19
19k
freee-shigure-matsuri-20150321
futoase
8
2.1k
Other Decks in Technology
See All in Technology
ワールドカフェI /チューターを改良する / World Café I and Improving the Tutors
ks91
PRO
0
120
EMとして2023年度に頑張ったこと / What we did well in FY2023 as a EM
pauli
1
170
元インフラエンジニアに成る / Human Resources to Human Relations
bobtani
4
930
Python と Snowflake はズッ友だょ!~ Snowflake の Python 関連機能をふりかえる ~
__allllllllez__
1
120
アクセシビリティを考慮したUI/CSSフレームワーク・ライブラリ選定
yajihum
2
1k
GraphQL 成熟度モデルの紹介と、プロダクトに当てはめた事例 / GraphQL maturity model
mh4gf
7
1.4k
どうするコスト最適化のトレードオフ
tetsuyaooooo
1
530
オーナーシップを持つ領域を明確にする
konifar
13
3.2k
Gitlab本から学んだこと - そーだいなるプレイバック / gitlab-book
soudai
4
440
KubeCon EU 2024 Recap “Kubernetes Policy Time Machine: Where to Next?”
ryysud
0
220
20240418_Google ColabにLLMが搭載されたようなのでPython x データ分析の勉強方法を考えてみる
doradora09
0
140
ゼロから始めるVue.jsコミュニティ貢献 / first-vuejs-community-contribution-link-and-motivation
lmi
1
130
Featured
See All Featured
Fireside Chat
paigeccino
21
2.6k
How To Stay Up To Date on Web Technology
chriscoyier
782
250k
Designing Experiences People Love
moore
136
23k
Large-scale JavaScript Application Architecture
addyosmani
504
110k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
357
22k
How GitHub (no longer) Works
holman
304
140k
Java REST API Framework Comparison - PWX 2021
mraible
PRO
18
6.9k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
14
1.6k
Building Applications with DynamoDB
mza
88
5.6k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
60
14k
[RailsConf 2023] Rails as a piece of cake
palkan
23
4k
The World Runs on Bad Software
bkeepers
PRO
61
6.7k
Transcript
ϋϚͬͨͱ͜Ζ දࢀಓ.rb #44 2019/3/7
ࣗݾհ • Piece of Cake, Inc. • দ࡚ ܒ࣏ (·͖ͭ͟
͚͍͡) • αʔόαΠυ݉ΠϯϑϥΤϯδχΞ • 20191݄͔Β
RubyRailsͷਂ ͖·ͤΜm(_ _)m
ϋϚͬͨࣄྫͷ͝հ
uniq
uniq • ͖͔͚ͬRails 4.2 -> 5.1ͷΞοϓάϨʔυ͕࠷ॳͷࣄ • deprecated 5.0 ->
5.1ΑΓ • distinctʹॻ͖͑Δඞཁ͕͋Δ • uniqΛ͋Δఔݕࡧ͍͕ͯͨ͠ɺͱ͋ΔՕॴͰॻ͖͑ ࿙Ε͕͋ͬͨ
uniq • ActiveRecord::RelationʹͯuniqΛ͏ͱSELECT DISTINCT… ͱ DISTINCTจʹม͑ͯ͘ΕΔػೳ • Rails 5.1͔ΒɺActiveRecord::RelationEnumerableΛ includeͯ͠ରԠ͢ΔΑ͏ʹͳͬͨͷͰɺArrayΛฦ͢
uniq • ى͖ͨ -> SELECT id FROM… ʹͯऔಘͨ͠IDΛݩʹ ϨίʔυΛݕࡧ͢ΔΫΤϦ͕͋ͬͨ •
uniqͰɺDISTINCT͕ޮ͍ͨͱ͖ɺidͷ͕ߜΓࠐ·Εͯ ͍ͨ
uniq • طଘͷΫΤϦn✕n✕n…(ੵ)ɺDISTINCT͕༗ޮʹͳΒͳ ͍ͱऔಘ͢ΔϨίʔυ͕૿͑ΔΑ͏ʹͳ͍ͬͯͨ • EXPLAINͰ࣮ߦͯ͠ɺΫΤϦύϑΥʔϚϯε݁ՌΛݟͯ ͋ͱͰڍಈΛ֬ೝͰ͖ͨ
uniq • Rails 5.1͔Βɺuniqͦͷͷͷϝιου׆༻Ͱ͖Δͷͩ ͕ɺArrayͱͯ͠ฦͬͯ͘Δ • Rails 5.0 -> 5.1ΞοϓάϨʔυ࣌ʹϨίʔυͷগͳ͍
ڥͰಈ࡞֬ೝΛ͢ΔͨΊɺಈ࡞ʹؔͯ͠ΈΒΕͣ
uniq • Production deployޙɺҰ෦Controller#ActionͷϨεϙϯε λΠϜ͕େ͖͘ͳΔ • unicornͷϓϩηε͕Ԡ͠ͳ͘ͳΔ • ଞͷunicornϓϩηε͕ଞͷϦΫΤετΛॲཧ͠Α͏ͱ͠ ͯɺಉ͡Controller#ActionͷॲཧΛ࣮ߦͯ͠͠·͏
uniq • ͱͳΔController#ActionΛ͍ͬͯ͘ͱɺuniqͱॻ͔ Ε͍ͯͨɻ • uniq͔Βdistinctʹஔ͖͑Δͱ͕ࢭΜͩ
deprecatedͱܯࠂ͞Εͨޙ Ҿ͖ଓ͖͑Δϝιουʹ ҙ͠Α͏
Rails Update࣌ʹ Upgrade GuideΛݟΑ͏
ଞ (աڈͷܦݧ)
ଞ (աڈͷܦݧ) • INDEXΛࢥͬͨΑ͏ʹͬͯ͘Ε͍ͯͳ͍͜ͱ͕Θ͔ͬͨ ͷͰɺFORCE INDEXΛ͏Α͏ʹվળ͢Δ • SELECT … FOR
UPDATE Λൃߦதɺ͏͔ͬΓtransaction blockʹ ଞαʔϏε ͷAPIΞΫηεΛߦ͏ॲཧΛೖΕͯ ͠·͏ • ଞαʔϏεͷϦΫΤετॲཧʹࣦഊ͠ߦLOCKΛѲͬͨ· ·ʹͳΓঃʑʹϦΫΤετʹ٧·͍ͬͯ͘ͳͲ
ऴΘΓ
ࢀߟ • ActiveRecord::Relation distinct method (Rails 4.2) • https://github.com/rails/rails/blob/v4.2.11/activerecord/ lib/active_record/relation/query_methods.rb#L776
• ActiveRecord::Relation (Rails 5.1) -> include Enumerable • https://github.com/rails/rails/blob/v5.1.6.1/activerecord/ lib/active_record/relation.rb
ࢀߟ • ΠϯσοΫεώϯτͷߏจ (FORCE INDEX) • https://dev.mysql.com/doc/refman/5.6/ja/index-hints.html • ϩοΫಡΈऔΓ (SELECT
… FOR UPDATE) • https://dev.mysql.com/doc/refman/5.6/ja/innodb-locking- reads.html
ࢀߟ • Rails Upgrade Guide (ຊޠ൛) • https://railsguides.jp/upgrading_ruby_on_rails.html