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
310
Riak -- Seattle Scalability
jtuple
2
460
Hansei: Property-based Development of Concurrent Systems
jtuple
3
1.9k
Riak 1.2 Webinar Preview
jtuple
1
260
Test First Construction of Distributed Systems
jtuple
3
1k

Other Decks in Programming

See All in Programming
バックエンドのためのアプリ内課金入門 (サブスク編)
qnighy
7
1.5k
DMMオンラインサロンアプリのSwift化
hayatan
0
270
ISUCON14感想戦で85万点まで頑張ってみた
ponyo877
1
790
動作確認やテストで漏れがちな観点3選
starfish719
5
880
Оптимизируем производительность блока Казначейство
lamodatech
0
990
EC2からECSへ 念願のコンテナ移行と巨大レガシーPHPアプリケーションの再構築
sumiyae
3
630
社内フレームワークとその依存性解決 / in-house framework and its dependency management
vvakame
1
500
2024年のkintone API振り返りと2025年 / kintone API look back in 2024
tasshi
0
180
Scaling your build logic
antalmonori
1
150
チームの立て直し施策をGoogleの 『効果的なチーム』と見比べてみた
maroon8021
0
280
個人アプリを2年ぶりにアプデしたから褒めて / I just updated my personal app, praise me!
lovee
0
300
asdf-ecspresso作って 友達が増えた話 / Fujiwara Tech Conference 2025
koluku
0
1.6k

Featured

See All Featured
4 Signs Your Business is Dying
shpigford
182
22k
The MySQL Ecosystem @ GitHub 2015
samlambert
250
12k
The Cost Of JavaScript in 2023
addyosmani
47
7.3k
Designing on Purpose - Digital PM Summit 2013
jponch
117
7.1k
Making the Leap to Tech Lead
cromwellryan
133
9.1k
Six Lessons from altMBA
skipperchong
27
3.6k
Done Done
chrislema
182
16k
Building Better People: How to give real-time feedback that sticks.
wjessup
366
19k
How GitHub (no longer) Works
holman
312
140k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
How STYLIGHT went responsive
nonsquared
96
5.3k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
28
4.5k

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