Upgrade to Pro — share decks privately, control downloads, hide ads and more …

RICON West 2012: Bringing Consistency to Riak (...

Joseph Blomstedt
October 30, 2013
Programming
3
700

RICON West 2012: Bringing Consistency to Riak (Part 2)

Joseph Blomstedt

October 30, 2013
Tweet

More Decks by Joseph Blomstedt

See All by Joseph Blomstedt
Data Structure Adventures for Fun, Profit, and Performance
jtuple
2
320
Riak -- Seattle Scalability
jtuple
2
460
Hansei: Property-based Development of Concurrent Systems
jtuple
3
1.9k
Riak 1.2 Webinar Preview
jtuple
1
270
Test First Construction of Distributed Systems
jtuple
3
1k

Other Decks in Programming

See All in Programming
Djangoアプリケーション 運用のリアル 〜問題発生から可視化、最適化への道〜 #pyconshizu
kashewnuts
1
250
GitHub Actions × RAGでコードレビューの検証の結果
sho_000
0
270
SwiftUI Viewの責務分離
elmetal
PRO
1
240
sappoRo.R #12 初心者セッション
kosugitti
0
260
『テスト書いた方が開発が早いじゃん』を解き明かす #phpcon_nagoya
o0h
PRO
2
290
SwiftUIで単方向アーキテクチャを導入して得られた成果
takuyaosawa
0
270
SpringBoot3.4の構造化ログ #kanjava
irof
2
1k
Amazon Q Developer Proで効率化するAPI開発入門
seike460
PRO
0
110
Flutter × Firebase Genkit で加速する生成 AI アプリ開発
coborinai
0
160
楽しく向き合う例外対応
okutsu
0
140
Lottieアニメーションをカスタマイズしてみた
tahia910
0
130
AIの力でお手軽Chrome拡張機能作り
taiseiue
0
170

Featured

See All Featured
Docker and Python
trallard
44
3.3k
Statistics for Hackers
jakevdp
797
220k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
33
2.1k
Six Lessons from altMBA
skipperchong
27
3.6k
Designing for Performance
lara
604
68k
Embracing the Ebb and Flow
colly
84
4.6k
What's in a price? How to price your products and services
michaelherold
244
12k
A better future with KSS
kneath
238
17k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
4
410
Thoughts on Productivity
jonyablonski
69
4.5k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
21
2.5k
ピンチをチャンスに：未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
114
50k

Transcript

  1. Joseph Blomstedt (@jtuple) Basho Technologies Bringing Consistency To Riak (Part

    2) Tuesday, October 29, 13

  2. CAP Theorem 2 Tuesday, October 29, 13

  3. 3 Partition-tolerance Consistency Availability Tuesday, October 29, 13

  4. 4 Partition-tolerance Consistency Availability Tuesday, October 29, 13

  5. 5 Partition-tolerance Consistency Availability CP AP Tuesday, October 29, 13

  6. 6 Partition-tolerance Consistency Availability CP AP Tuesday, October 29, 13

  7. 7 Partition-tolerance Consistency Availability CP AP Tuesday, October 29, 13

  8. 8 C/P Strict Quorum A/P Sloppy Quorum A/P Tuesday, October

    29, 13

  9. 9 C/P Strict Quorum A/P Sloppy Quorum A/P Tuesday, October

    29, 13

  10. 10 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  11. 11 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  12. 12 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  13. 13 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  14. 14 C/P Strict Quorum A/P Sloppy Quorum A/P Tuesday, October

    29, 13

  15. 15 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  16. 16 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  17. 17 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  18. 18 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  19. 19 C/P Strict Quorum A/P Sloppy Quorum A/P Tuesday, October

    29, 13

  20. 20 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  21. 21 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  22. 22 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  23. 23 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client Tuesday, October 29, 13

  24. 24 Node 1 Node 2 Node 3 Node 4 Node

    5 client client client client client Tuesday, October 29, 13

  25. Eventual Consistency 25 Tuesday, October 29, 13

  26. 26 A A A Tuesday, October 29, 13

  27. 27 A A A Tuesday, October 29, 13

  28. 28 A A A B Tuesday, October 29, 13

  29. 29 A A A B Tuesday, October 29, 13

  30. 30 A A A B B B B Tuesday, October

    29, 13

  31. 31 A A A Tuesday, October 29, 13

  32. 32 A A A B C Tuesday, October 29, 13

  33. 33 A A A B C Tuesday, October 29, 13

  34. 34 A A A B {B,C} {B,C} {B,C} C Tuesday,

    October 29, 13

  35. 35 Write Once Immutable Last Write Wins Business Rules CRDTs/Monotonicity

    Tuesday, October 29, 13

  36. 36 Write Once Immutable Last Write Wins Business Rules CRDTs/Monotonicity

    Tuesday, October 29, 13

  37. 37 Write Once Immutable Last Write Wins Business Rules CRDTs/Monotonicity

    Tuesday, October 29, 13

  38. 38 Write Once Immutable Last Write Wins Business Rules CRDTs/Monotonicity

    Tuesday, October 29, 13

  39. 39 Write Once Immutable Last Write Wins Business Rules CRDTs/Monotonicity

    Tuesday, October 29, 13

  40. 40 Write Once Immutable Last Write Wins Business Rules CRDTs/Monotonicity

    Tuesday, October 29, 13

  41. Strong Consistency 41 Tuesday, October 29, 13

  42. Strong Consistency 42 Why? Tuesday, October 29, 13

  43. Strong Consistency 43 Recency Tuesday, October 29, 13

  44. Strong Consistency 44 Recency Partial Writes Tuesday, October 29, 13

  45. Strong Consistency 45 Recency Partial Writes Atomicity Tuesday, October 29,

    13

  46. 46 Recency Partial Writes Atomicity Tuesday, October 29, 13

  47. 47 Recency Partial Writes Atomicity Tuesday, October 29, 13

  48. 48 Eventual consistency is great Tuesday, October 29, 13

  49. 49 But, when is eventual? Tuesday, October 29, 13

  50. 50 Do I have the most recent value? Tuesday, October

    29, 13

  51. 51 CRDTs don’t help Tuesday, October 29, 13

  52. 52 (a,1) (a,1) (a,1) =1 Tuesday, October 29, 13

  53. 53 (a,1) (a,1) (a,1) Tuesday, October 29, 13

  54. 54 (a,1) +1 +3 (a,1) (a,1) (a,2) (a,1),(b,3) =2 =4

    Tuesday, October 29, 13

  55. 55 (a,1) +1 +3 (a,1) (a,1) (a,2) (a,1),(b,3) Tuesday, October

    29, 13

  56. 56 (a,1) +1 +3 (a,1) (a,1) (a,2) (a,1),(b,3) (a,2),(b,3) (a,2),(b,3)

    (a,2),(b,3) Tuesday, October 29, 13

  57. 57 (a,1) +1 +3 (a,1) (a,1) (a,2) (a,1),(b,3) (a,2),(b,3) (a,2),(b,3)

    (a,2),(b,3) =5 Tuesday, October 29, 13

  58. 58 (a,1) +1 +3 (a,1) (a,1) (a,2) (a,1),(b,3) =2 =4

    Tuesday, October 29, 13

  59. 59 Recency Partial Writes Atomicity Tuesday, October 29, 13

  60. 60 A write B (fail) A A B A A

    Tuesday, October 29, 13

  61. 61 B A A Tuesday, October 29, 13

  62. 62 B A A read A read A read A

    Tuesday, October 29, 13

  63. 63 B A A read A read A read A

    Tuesday, October 29, 13

  64. 64 B A A read A read A read A

    read B Tuesday, October 29, 13

  65. 65 Recency Partial Writes Atomicity Tuesday, October 29, 13

  66. Strong Consistency 66 Tuesday, October 29, 13

  67. Strong Consistency 67 What does mean for Riak 2.0? Tuesday,

    October 29, 13

  68. 68 Conditional single key atomic operations Tuesday, October 29, 13

  69. 69 No siblings Tuesday, October 29, 13

  70. 70 get sees most recent put Tuesday, October 29, 13

  71. 71 get/modify/put fails if object changed Tuesday, October 29, 13

  72. 72 get/modify/put fails if object changed (eg. concurrent put) Tuesday,

    October 29, 13

  73. 73 puts w/o vclock fails if object exists Tuesday, October

    29, 13

  74. 74 partial writes resolved on read Tuesday, October 29, 13

  75. 75 Consensus Tuesday, October 29, 13

  76. 76 Paxos Tuesday, October 29, 13

  77. 77   1RGH    1RGH  

     1RGH    1  SUHSDUH 1   SURPLVH 1 9 %  SURPLVH 1 9 &  9 1 I 9 $  9 %  9 &  FRPPLW 1 9 1    DFFHSW 1  Tuesday, October 29, 13

  78. 78 Rinse/repeat for each request Tuesday, October 29, 13

  79. 79 2 round trips/request Tuesday, October 29, 13

  80. 80 Multi-Paxos Tuesday, October 29, 13

  81. 81 First Request Tuesday, October 29, 13

  82. 82   1RGH    1RGH  

     1RGH    1 ,   SUHSDUH 1 ,   SURPLVH 1 , 9 %  SURPLVH 1 , 9 &  9 1 I 9 $  9 %  9 &  FRPPLW 1 , 9 1    DFFHSW 1 ,  Tuesday, October 29, 13

  83. 83 Each Additional Request Tuesday, October 29, 13

  84. 84   1RGH    1RGH  

     1RGH    ,  FRPPLW 1 , 9    DFFHSW 1 ,  Tuesday, October 29, 13

  85. 85 1 round trip/request (common case) Tuesday, October 29, 13

  86. 86 Problem Shipping entire state each request is expensive Tuesday,

    October 29, 13

  87. 87 Solution Paxos + Replicated Log Tuesday, October 29, 13

  88. 88 Problem Now I have N problems Tuesday, October 29,

    13

  89. 89 Log recovery Log trimming Rollup Snapshots Fault Recovery Tuesday,

    October 29, 13

  90. 90 Choose your own adventure... Tuesday, October 29, 13

  91. 91 Better Solution Build log replication into protocol Tuesday, October

    29, 13

  92. 92 Better Solution ZK Atomic Broadcast Raft Tuesday, October 29,

    13

  93. Zab 93 Tuesday, October 29, 13

  94. 94 Tuesday, October 29, 13

  95. 95 Tuesday, October 29, 13

  96. 96 Tuesday, October 29, 13

  97. 97 Tuesday, October 29, 13

  98. Raft 98 Tuesday, October 29, 13

  99. 99 Tuesday, October 29, 13

  100. 100 raftconsensus.github.io Tuesday, October 29, 13

  101. 101 Text Tuesday, October 29, 13

  102. Back to Riak 102 Tuesday, October 29, 13

  103. 103 Key/Value Keys are independent Active Anti-Entropy Tunable backends Tuesday,

    October 29, 13

  104. 104 Each key is independent state Tuesday, October 29, 13

  105. 105 Simple multi-paxos per key Tuesday, October 29, 13

  106. 106 1B keys = 1B consensus groups? Tuesday, October 29,

    13

  107. 107 No Tuesday, October 29, 13

  108. 108 Consensus group per preflist (replica set) Tuesday, October 29,

    13

  109. 109 Emulate paxos per key Tuesday, October 29, 13

  110. Node 0 Node 1 Node 2 Tuesday, October 29, 13

  111. 111 1 2 3 4 5 6 7 123 Tuesday,

    October 29, 13

  112. 112 1 2 3 4 5 6 7 123 234

    Tuesday, October 29, 13

  113. 113 1 2 3 4 5 6 7 123 234

    345 Tuesday, October 29, 13

  114. 114 1 2 3 4 5 6 7 123 234

    345 456 Tuesday, October 29, 13

  115. 115 1 2 3 4 5 6 7 123 234

    345 456 567 ... Tuesday, October 29, 13

  116. 116 1 2 3 4 5 6 7 123 234

    345 456 567 Ensembles ... Tuesday, October 29, 13

  117. 117 64 partition ring = 64 ensembles Tuesday, October 29,

    13

  118. 118 Each Ensemble Elects leader Establishes epoch Supports get/put ops

    Tuesday, October 29, 13

  119. 119 Establish a new epoch Tuesday, October 29, 13

  120. 120   1RGH    1RGH  

     1RGH    1 ,   SUHSDUH 1 ,   SURPLVH 1 , 9 %  SURPLVH 1 , 9 &  9 1 I 9 $  9 %  9 &  FRPPLW 1 , 9 1    DFFHSW 1 ,  Tuesday, October 29, 13

  121. 121 consensus state epoch sequence membership leader Tuesday, October 29,

    13

  122. 122 K/V objects epoch sequence key value Tuesday, October 29,

    13

  123. 123 GET leader reads local object if obj.epoch old: refresh

    reply w/ val Tuesday, October 29, 13

  124. 124   1RGH    1RGH  

     1RGH    REMHSRFK  HSRFK  JHW .H\   UHSO\ (SRFK %  6HT %  9DO %  UHSO\ (SRFK &  6HT &  9DO &  9DO ODWHVW 9DO $  9DO %  9DO & 9DOHSRFK HSRFK  ZULWH (SRFK 6HT 9DO    DFN (SRFK 6HT  Tuesday, October 29, 13

  125. 125   1RGH    1RGH  

     1RGH    REMHSRFK HSRFK  5HSO\ ORFDOBJHW .H\  Tuesday, October 29, 13

  126. 126 2 roundtrips/get (worst) 0 roundtrip/get (best) Tuesday, October 29,

    13

  127. 127 PUT leader reads local object if obj.epoch old: refresh

    if modify(obj) false: fail commit modified obj reply ok Tuesday, October 29, 13

  128. 128   1RGH    1RGH  

     1RGH    REMHSRFK  HSRFK  JHW .H\   UHSO\ (SRFK %  6HT %  9DO %  UHSO\ (SRFK &  6HT &  9DO &  /DWHVW ODWHVW 9DO $  9DO %  9DO & 9DO PRGLI\ /DWHVW  ZULWH (SRFK 6HT 9DO    DFN (SRFK 6HT  Tuesday, October 29, 13

  129. 129   1RGH    1RGH  

     1RGH    REMHSRFK HSRFK  /DWHVW ORFDOBJHW .H\ 9DO PRGLI\ /DWHVW  ZULWH (SRFK 6HT 9DO    DFN (SRFK 6HT  Tuesday, October 29, 13

  130. 130 2 roundtrips/put (worst) 1 roundtrip/put (best) Tuesday, October 29,

    13

  131. 131 Leader abandons leadership if any quorum operation ever fails

    Tuesday, October 29, 13

  132. 132 Which forces new epoch to be established Tuesday, October

    29, 13

  133. 133 Partial Writes Tuesday, October 29, 13

  134. failed partial write X (2) X (2) X (2) X

    (2) X (2) Y (2) epoch 2 epoch 3 Tuesday, October 29, 13

  135. read / rewrite / reply X X (2) X (2)

    Y (2) X (3) X (3) Y (2) epoch 3 epoch 3 Tuesday, October 29, 13

  136. X (3) X (3) Y (2) X (3) X (3)

    X (3) read / repair / reply X epoch 3 epoch 3 Tuesday, October 29, 13

  137. Usage 137 Tuesday, October 29, 13

  138. 138 AP or CP per bucket type Tuesday, October 29,

    13

  139. 139 consistent = true Tuesday, October 29, 13

  140. 140 $ riak-admin bucket-type create strong \ '{"props": {"consistent": true}}'

    strong created Tuesday, October 29, 13

  141. 141 $ riak-admin bucket-type activate strong strong has been activated

    Tuesday, October 29, 13

  142. 142 > riakc_pb_socket:get(Socket, {<<"strong">>, <<"bucket">>}, <<"key">>). {error,notfound} Tuesday, October 29,

    13

  143. 143 > Obj = riakc_obj:new({<<"strong">>, <<"bucket">>}, <<"key">>, <<"1">>)). > riakc_pb_socket:put(Socket,

    Obj). ok Tuesday, October 29, 13

  144. 144 > Obj2 = riakc_obj:new({<<"strong">>, <<"bucket">>}, <<"key">>, <<"2">>)). > riakc_pb_socket:put(Socket,

    Obj2). {error, failed} Tuesday, October 29, 13

  145. 145 {ok, Obj3} = riakc_pb_socket:get(Socket, {<<"strong">>, <<"bucket">>}, <<"key">>). Tuesday, October

    29, 13

  146. 146 Obj4 = riakc_obj:update_value(Obj3, <<"2">>). Tuesday, October 29, 13

  147. 147 Obj5 = riakc_obj:update_value(Obj3, <<"22">>). Tuesday, October 29, 13

  148. 148 > riakc_pb_socket:put(Socket, Obj4). ok Tuesday, October 29, 13

  149. 149 > riakc_pb_socket:put(Socket, Obj5). {error,<<"failed">>} Tuesday, October 29, 13

  150. 150 Your client may vary Tuesday, October 29, 13

  151. 151 Your client may vary We’re working on it Tuesday,

    October 29, 13

  152. Tech Preview 152 Tuesday, October 29, 13

  153. 153 No AAE syncing No 2i No stats Tuesday, October

    29, 13

  154. 154 Will be in 2.0 final Tuesday, October 29, 13

  155. Coming Soon 155 Tuesday, October 29, 13

  156. 156 Datatypes Multi-DC Lightweight Tx? Perf benchmarks Tuesday, October 29,

    13

  157. 157 Datatypes Multi-DC Lightweight Tx? Perf benchmarks Tuesday, October 29,

    13

  158. 158 Datatypes Multi-DC Lightweight Tx? Perf benchmarks Tuesday, October 29,

    13

  159. 159 Datatypes Multi-DC Lightweight Tx? Perf benchmarks Tuesday, October 29,

    13

  160. 160 Datatypes Multi-DC Lightweight Tx? Perf benchmarks Tuesday, October 29,

    13

  161. Questions? 161 Tuesday, October 29, 13