Building Unbreakable Software

A presentation I gave to Toronto AWS Users United on Building Unbreakable Software. Turns out, you can't!

Transcript

1. NATE SMITH @nwjsmith theinternate.com
3. BUILDING UNBREAKABLE SOFTWARE
5. GET GOING
 FAST
6. $
7. $
8. $
10. ಠ_ಠ
11. FREE LUNCH
12. FREE LUNCH N O PE
13. $/AWESOME
14. THE COMPUTER IS RELIABLE.
15. THE COMPUTER IS RELIABLE. N O PE
16. XEN
17. 175KLOC
19. MULTITENANCY
20. LIFETIME CONTROL
21. BUILDING UNBREAKABLE SOFTWARE
22. ?
23. BUILDING UNBREAKABLE SOFTWARE
24. BUILDING UNBREAKABLE SOFTWARE
27. CLIENTS
28. LOAD BALANCING CLIENTS
29. APP SERVERS LOAD BALANCING CLIENTS
30. APP SERVERS DATABASE LOAD BALANCING CLIENTS
31. APP SERVERS DATABASE LOAD BALANCING CLIENTS
32. APP SERVERS DATABASE LOAD BALANCING CLIENTS
33. APP SERVERS DATABASE LOAD BALANCING CLIENTS
34. APP SERVERS DATABASE LOAD BALANCING CLIENTS
35. APP SERVERS DATABASE LOAD BALANCING CLIENTS ಠ_ಠ
50. ಠ_ಠ
51. THE NETWORK IS RELIABLE.
52. THE NETWORK IS RELIABLE. N O PE
58. $
63. “CUSTOMERS SHOULD BE ABLE TO VIEW AND ADD ITEMS TO THEIR SHOPPING CART EVEN IF DISKS ARE FAILING, NETWORK ROUTES ARE FLAPPING, OR DATA CENTERS ARE BEING DESTROYED BY TORNADOS. THEREFORE, THE SERVICE RESPONSIBLE FOR MANAGING SHOPPING CARTS REQUIRES THAT IT CAN ALWAYS WRITE TO AND READ FROM ITS DATA STORE”
66. A B E D C
67. A B E D C
68. A B E D C
69. A B E D C
70. WRITES
71. A B E D C
72. A B E D C
73. A B E D C
74. A B E D C
75. A B E D C
76. READS
77. A B E D C
78. A B E D C
79. A B E D C
80. ?
81. A B E D C
82. A B E D C
83. A B E D C
84. A B E D C
85. A B E D C
86. A B E D C
87. A B E D C
88. A B E D C
89. A B E D C
90. CAP THEOREM
93. CONSISTENCY AVAILABILITY PARTITION TOLERANCE
94. CONSISTENCY AVAILABILITY PARTITION TOLERANCE ✔
95. A B E D C
99. ?
104. IT’S A BUSINESS DECISION
105. WE TRADED CONSISTENCY FOR AVAILABILITY
106. CP
107. CP
108. AP CP
109. AP CP
110. WE CAN TRADE CONSISTENCY FOR AVAILABILITY
111. WE CAN TRADE AVAILABILITY FOR CONSISTENCY
112. LOCKS
113. QUEUES
114. LOTS OF RESEARCH
119. BUILD BREAKABLE SOFTWARE
120. BUILD UNBREAKABLE BUSINESSES
121. ?