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
A New Concept of Consistency in Distributed Database and Implementation in Riak
Search
UENISHI Kota
November 28, 2013
Technology
10
3.5k
A New Concept of Consistency in Distributed Database and Implementation in Riak
Web+DB forum 技術報告 by Basho
UENISHI Kota
November 28, 2013
Tweet
Share
More Decks by UENISHI Kota
See All by UENISHI Kota
Metadata Management in Distributed File Systems
kuenishi
2
410
Behind The Scenes: Cloud Native Storage System for AI
kuenishi
2
270
Apache Ozone behind Simulation and AI Industries
kuenishi
0
210
Distributed Deep Learning with Chainer and Hadoop
kuenishi
3
990
A Few Ways to Accelerate Deep Learning
kuenishi
0
940
Introducing Retz
kuenishi
5
920
Introducing Retz and how to develop practical frameworks
kuenishi
3
590
Formalization and Proof of Distributed Systems (ja)
kuenishi
10
6.1k
Mesos Frameworkの作り方 (How to Make Mesos Framework)
kuenishi
7
2.2k
Other Decks in Technology
See All in Technology
Azure犬駆動開発の記録/GlobalAzureFukuoka2024_20240420
nina01
1
220
Tellus の衛星データを見てみよう #mf_fukuoka
kongmingstrap
0
210
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
プロンプトエンジニアリングでがんばらない-Agentic Workflow へ-近藤憲児
kenjikondobai
3
850
IaCジェネレーターとBedrockで詳細設計書を生成してみた
tsukasa_ishimaru
1
280
Google Cloud の AI を支える裏側のインフラを垣間見る!
maroon1st
0
360
Azure Container Apps + Bicep 〜 こんな感じで運用しています
kaz29
2
480
APIファーストなプロダクトマネジメントの実践 〜SaaSus Platformでの例〜 / "Practicing API-First Product Management - An Example with SaaSus Platform
oztick139
0
110
ExaDB-D dbaascli で出来ること
oracle4engineer
PRO
0
2.1k
Google Cloud Next '24 Recap(Cloud Run/k8s)
mokocm
0
240
エンジニア候補者向け資料2024.04.24.pdf
macloud
0
3.3k
検証を通して見えてきたTiDBの性能特性
lycorptech_jp
PRO
6
3.8k
Featured
See All Featured
Design by the Numbers
sachag
274
18k
Why You Should Never Use an ORM
jnunemaker
PRO
51
8.6k
Thoughts on Productivity
jonyablonski
58
3.8k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
501
140k
The Illustrated Children's Guide to Kubernetes
chrisshort
31
46k
jQuery: Nuts, Bolts and Bling
dougneiner
59
7.1k
Git: the NoSQL Database
bkeepers
PRO
422
63k
Navigating Team Friction
lara
178
13k
How to train your dragon (web standard)
notwaldorf
73
5.2k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
14
1.6k
Ruby is Unlike a Banana
tanoku
96
10k
Clear Off the Table
cherdarchuk
84
310k
Transcript
ࢄσʔλϕʔεʹ͓͚Δ ৽͍͠߹ੑϞσϧͱ Riakʹ͓͚Δ࣮ 2013 / 11 / 28 WebDB Forum
Basho ্߁ଠ
ࢄσʔλϕʔεʹ͓͚Δ ݹͯ͘৽͍͠߹ੑϞσϧͱ Riakʹ͓͚Δ࣮ 2013 / 11 / 28 WebDB Forum
Basho ্߁ଠ
BashoͱRiak •ࢄσʔλϕʔεʁ •RiakΛ͍ͬͯΔʁ •BashoΛ͍ͬͯΔʁ
CAPఆཧͱཧͷDB •ͲΜͳނোʹରͯ͠ (partition tolerance) •σʔλৗʹ߹͓ͯ͠Γ (consistency) •γεςϜ͕ࢭ·Δ͜ͱͳ͍ (availability) ͜ͷ3ͭΛಉ࣌ʹຬͨ͢γεςϜଘࡏ͠ͳ͍
•Մ༻ੑ (Availability) ͕ಛͷσʔλ ϕʔε •ӡ༻͍͢͠ɺେ͖ͳσʔλͰೖΔ •҆ఆੑɺ༧ଌՄೳੑ •ʮσʔλΛઈରʹͳ͘͞ͳ͍ʯ
͜Μͳͱ͜ΖͰ ಈ͍͍ͯ·͢Riak •Rovio (Angry Birds) •Yahoo!JAPAN ͷΫϥυετϨʔδ •NHS (ΠΪϦε ࠃຽอݥαʔϏε)
•Bump (=>Google) •ۜߦɺήʔϜɺখചɺηϯαʔɺetc…
How Riak Works
Consistent Hashing • 160-bit Ωʔۭؒ • ۭؒΛ͢Δ • ύʔςΟγϣϯϊʔ υ͕ݸผཧ
• ϨϓϦΧNݸͷύʔ ςΟγϣϯʹίϐʔ͞ ΕΔ OPEF OPEF OPEF OPEF hash(“meetups/spamham”) N=3
Consistency͍͠ •ߋ৽ΛࢭΊΔʢAvailabilityΛԼ͛Δʣ͔ɺߋ৽ͷ্ॻ͖Λ ڐ͢ʢσʔλΛࣦ͏ʣ͔͔͠બࢶ͕ͳ͍ Server2 Server1 Server3 PUT V=42 PUT V=0
V=?
ConsistencyͷΘΓʹ •ͱΓ͋͑ͣෳͷόʔδϣϯͷڞଘΛڐ͢ •Ͳͷόʔδϣϯ͕ਖ਼͍͔͠ɺ͘͠Ϛʔδ͢Δ͔ΛRead࣌ʹܾఆ Server2 Server1 Server3 PUT V=42 PUT V=0
V=0 or 42 V=0 V=0 or 42 V=42
APΛ࣮ݱ •ωοτϫʔΫஅ͕ى͖͍ͯͯͱΓ͋͑ͣॻ͖ࠐΈΛڐ͢ Server2 Server1 Server3 PUT V=42 PUT V=0 Server4
෮چͨ͠Βॻ͖͢ ྆ํ͓࣋ͬͯ͘
γϣοϐϯάΧʔτͷྫ •UnionΛͱΕΑ͍ Server2 Server1 Server3 PUT cart=[a,b,d] PUT cart=[a,b,c] union([a,b,c],
[a,b,d]) => [a,b,c,d] [a,b,c] [a,b,c] or [a,b,d] [a,b,d]
ෳόʔδϣϯΛ ڐ͢͜ͱͷ •ϓϩάϥϛϯά͕͍͠ʢτϥϯβΫγϣϯૉ Β͍͠ʣ •ݱ࣮ੈքγϣοϐϯάΧʔτͱΧϯλʔ͚ͩ Ͱͳ͍ •҆શͳMerge, update͕Ͱ͖ΔσʔλߏΛຖճ ߟ͑ͳ͚ΕͳΒͳ͍ •͍ͬͯΔ͏ͪʹࣅͨΑ͏ͳϥΠϒϥϦ͕͋ͪ͜
ͪͰग़དྷ্͕Δ
ͳ͍ͥ͠ͷ͔ʁ •σʔλͷWriteͱWrite͕ೖΕସΘΓ͏ ΔʹSerializableͲ͜Ζ͔WriteҰ؏ ͨ͠ঢ়ଶʹͰ͖ͳ͍ Server2 Server1 Server3 w1 w2 w1
w2 w2 (w1 lost)
Logical Monoticity •σʔλʹର͢ΔՄͳૢ࡞ͷΈΛڐ͢ʂ Data = update(w2, update(w1, Data0)) = update(w1,
update(w2, Data0)) Data = merge(update(w2, Data0), Data)
͑: CRDT •ʮෳՄೳͳՄσʔλܕʯ •Conflict-Free Replicated Data Types •Commutative Replicated Data
Types •… •(Going to be included in Riak 2.0) ) CRDTͷ࡞ऀLogical Monotinicy ͱ͍͏ݴ༿͍ͬͯͳ͍
CRDT in Riak 2.0 •KVSͷVʹʮܕʯΛ࣋ͨͤͯɺܕʹΑͬͯ UpdateͱMergeͷϩδοΫΛܾΊΔ •Read࣌ʹMerge͕αʔόʔଆͰࣗಈతʹ࣮ ߦ͞ΕΔ •ΞϓϦέʔγϣϯܕΛࢦఆ͢Δ͚ͩͰΑ͘ɺ ෳόʔδϣϯͷϋϯυϦϯά͕ෆཁʹͳΔ
CRDT example •PN-Counter •Set •OR-sets •LWW-register •Graph…
PN-Counter •σϞ
PN-Counter • merge • {a: {1,-1}, b: {1,0}, c: {2,0}}
• {a: {0,0}, b: {2, 0}, c: {0, -2}} • => {a: {1,-1}, b:{2,0}, c:{2,-2}} => 2 • update • a͕ {increment, 3} Λड͚͚Δͱ • {a: {4,-1}, b: {1,0}, c: {2,0}}
OR-Sets • merge • {a:{“foo”:true}, b:{“bar”:false}} • + {a:{“foo”:true}, b:{“foo”:false,
“bar”:false}} • => {a:{“foo”:true}, b:{“foo”:false, “bar”:true}} • => [“bar”] • update • add: {a:{}} => +”foo” => {a:{“foo”:false}} • remove: {a: {“foo”:false}} => {a: {“foo”:true}}
OR-Sets •σϞ
Ϣʔεέʔε •ΫϦοΫͷΧϯτ (G-counter) • riak-server/types/counters/buckets/likes/datatypes/basho.com -d 1 •γϣοϐϯάΧʔτ (OR-sets) •ϩάΠϯϢʔβʔ
(PN-counter) •͜ΕΒͷΈ߹Θͤ (map & LWW-register, boolean) •{ name : “basho.com”, likes: 20000, users: 3000, links: [ “basho.co.jp”, “basho.co.uk” ], cool: true }
Ͱ͖ͳ͍͜ͱ •ʮ0Ҏ্ʯͷPN-counter •ϢχʔΫͳIDൃߦ •ͦͷଞCAS͕ඞཁͳσʔλߏͱૢ࡞
·ͱΊ •RiakՄ༻ੑͷ͋Δࢄσʔλϕʔε •ෳͷόʔδϣϯΛಉ࣌ʹอ࣋͢ΔͷΛ ڐ͢͜ͱͰՄ༻ੑΛ୲อ •ΞϓϦ։ൃͷқ͕՝ •CRDTͱ͍͏ܕͷಋೖʹΑΓ؆୯͔ͭ σʔλͷͳ͘ͳΒͳ͍ΈΛ࡞ͬͨ
Questions? •Riak 2.0 Λָ͠Έʹ͍ͯͩ͘͠͞ •Web: http://basho.co.jp •Twitter: @BashoJapan •Me:
[email protected]
•ML:
[email protected]
Useful links http://hal.upmc.fr/docs/00/55/55/88/PDF/techreport.pdf http://arxiv.org/pdf/1210.3368.pdf https://gist.github.com/russelldb/f92f44bdfb619e089a4d http://gsd.di.uminho.pt/members/cbm/ps/scadt3.pdf http://arxiv.org/abs/1011.5808