The document discusses scalable web architectures and common patterns for scaling web applications. It covers key topics like load balancing, caching, database replication, and data federation. The overall goal of application architecture is to scale traffic and data while maintaining high availability and performance. Horizontal scaling by adding more servers is preferable to vertical scaling of buying larger servers.

1. Scalable Web Architectures Common Patterns & Approaches Cal Henderson

13. Big Irons Sunfire E20k $450,000 - $2,500,000 36x 1.8GHz processors PowerEdge SC1435 Dualcore 1.8 GHz processor Around $1,500

14. Cost vs Cost

32. Trifle

33. Trifle Sponge / Database Jelly / Business Logic Custard / Page Logic Cream / Markup Fruit / Presentation

34. Trifle Sponge / Database Jelly / Business Logic Custard / Page Logic Cream / Markup Fruit / Presentation

35. App servers

36. App servers

37. App servers

46. Wackamole

47. Wackamole

51. Synchronous systems

52. Asynchronous systems

53. Helps with peak periods

54. Synchronous systems

55. Asynchronous systems

56. Asynchronous systems

60. Master-Slave Replication

61. Master-Slave Replication Reads and Writes Reads

62. Master-Slave Replication

63. Master-Slave Replication

64. Master-Slave Replication

65. Master-Slave Replication

66. Master-Slave Replication

67. Master-Slave Replication

68. Master-Slave Replication

69. Master-Slave Replication

73. Write-through cache

74. Write-back cache

75. Sideline cache

80. But what about HA?

81. But what about HA?

83. Master-Master

86. Rings

87. Rings

89. Dual trees

92. 1+1 = 200% hardware

93. 3+1 = 133% hardware

99. Data federation

108. Multiple Datacenters

112. Reverse proxy

119. Perlbal backhanding

122. Permission URLs

123. Permission URLs (or mod_perl)

129. Multiple volumes

131. Multiple hosts

134. HA Storage

138. Flickr Architecture

139. Flickr Architecture

140. LiveJournal Architecture

141. LiveJournal Architecture

142. Buy my book!

143. Or buy Theo’s

144. The end!