2. @raffi
Raffi Krikorian
Giving a talk at @StanfordACM.
Want to know about engineering for
real-time?
1 min ago via Twitter for iPhone Favorite Retweet Reply

6. @JordnJnkieJuice
✔Finally✈MF✈Famous✔
EARTHQUAKE !!!!!
1 min ago via Echofon Favorite Retweet Reply

8. @usgs

14. 300 miles
to
NYC

21. @remedyoakland
Remedy
Strawberry scones and rhubarb
turnovers in the house!
14 Apr via Facebook Favorite Retweet Reply

23. What’s a Tweet?

24. 48 characters
+1 for the bird
What’s a Tweet?
It’s a short message that's sent through
140 characters max

25. 1 tweet

26. sizeof(1 tweet)

27. sizeof(1 tweet)= 140 characters

28. sizeof(1 tweet)= 140 characters

29. sizeof(1 tweet)= 140 characters

30. sizeof(1 tweet)= 140 characters

31. sizeof(1 tweet)≈ 200 bytes

32. sizeof(1 tweet)≈ 200 bytes

33. = 140 characters
sizeof(1 tweet)
≈ 200 bytes

34. = 140 characters
sizeof(1 tweet)
≈ 200 bytes

35. @Astro_Soichi
Soichi Noguchi
http://twitpic.com/17dfqb -
8 Mar 10 via TwitPic Favorite Retweet Reply

36. @Astro_Soichi
Soichi Noguchi
http://twitpic.com/17dfqb -
8 Mar 10 via TwitPic Favorite Retweet Reply

38. About
Tweets a day

39. About
230,000,000
Tweets a day

40. 2.3E6 tweets
day

41. 2.3E6 tweets 2600 tweets
≈
day second

42. 2.3E6 tweets 2600 tweets
≈
day second

43. 2.3E6 tweets 2600 tweets
≈
day second

44. 2.3E6 tweets 2600 tweets
≈
day second

45. 2.3E6 tweets 2600 tweets
≈
day second
steady state

47. 7,196
TPS

49. Tokyo
6,600 TPS

51. 8,800 TPS

53. status/update

54. status/update

55. status/update

56. status/update
HTTP 200 OK
{

57. status/update
HTTP 200 OK
{

58. status/update
HTTP 200 OK

59. status/update
HTTP 200 OK

60. st

61. s

62. Snowflake
https://github.com/twitter/snowflake
s

63. s

64. s

65. s

66. s

67. s
Rockdove

68. s

69. s

72. t.co

75. {

76. {

77. Storage
{

78. {

79. status/update
HTTP 200 OK
{

80. status/update
HTTP 200 OK
{

81. status/update
HTTP 200 OK
{

82. HTTP 200 OK
{
…
"text":"Tweet!"
…
}

83. HTTP 200 OK
{
…
"text":"Tweet!"
…
}

84. HTTP 200 OK
{
…
"text":"Tweet!"
…
}

85. status/update
HTTP 200 OK
{
…
"text":"Tweet!"
…
}

86. status/update
HTTP 200 OK
{
…
"text":"Tweet!"
…
}

87. status/update
HTTP 200 OK
{
…
"text":"Tweet!"
…
}

89. status/update
Fanout
HTTP 200 OK
{
…
"text":"Tweet!"
…
}

90. status/update
Fanout
HTTP 200 OK
{
…
"text":"Tweet!"
…
}

91. te
Fanout
K

92. te
Fanout
K

93. te
Fanout
K

94. te
Flock
Fanout
K

95. te
Fanout
K

96. te
Fanout
K

97. status/update
Fanout
HTTP 200 OK
{
…
"text":"Tweet!"
…
}

98. status/update
Fanout
HTTP 200 OK
{
…
"text":"Tweet!"
…
}

101. followed by following

104. @ladygaga
mother mons†er
13.2 million followers
@justinbieber
Justin Bieber
12.4 million followers
@BarackObama
44th President of the United States
9.9 million followers
@raffi
me!
0.01 million followers

105. @ladygaga
mother mons†er
13.2 million followers
@raffi
me!
0.01 million followers

106. @ladygaga
mother mons†er
13.2 million followers
@raffi
me!
0.01 million followers

107. @ladygaga
mother mons†er
13.2 million followers
@raffi
me!
0.01 million followers
10000x more followers than me

108. @ladygaga
mother mons†er
13.2 million followers
@raffi
me!
0.01 million followers
scaling for 107

110. Has...
⇢ huge number of concurrent connections
⇢ lots of I/O
⇢ few persistent objects

112. Gosai Kiji
Phasianus versicolor also
known as Japanese Pheasant
is a bird of the lowlands.
Closely related to the
Common Pheasant, the cock
is distinguished by dark
green plumage on breast and
mantle. The male has an
iridescent violet neck, red
bare facial skin and purplish
green tail. The female is
smaller than male, and has a
dull brown plumage with
dark spots.

113. Gosai Kiji
Phasianus versicolor also
known as Japanese Pheasant
is a bird of the lowlands.
Closely related to the
Common Pheasant, the cock
is distinguished by dark
green plumage on breast and
mantle. The male has an
iridescent violet neck, red
bare facial skin and purplish
green tail. The female is
smaller than male, and has a
dull brown plumage with
dark spots.

116. needS...
⇢ ability to handle server workloads

117. needS...
⇢ ability to handle server workloads
⇢ flexibility in language

118. needS...
⇢ ability to handle server workloads
⇢ flexibility in language

119. needS...
⇢ ability to handle server workloads
⇢ flexibility in language

120. needS...
⇢ ability to handle server workloads
⇢ flexibility in language

121. needS...
⇢ ability to handle server workloads
⇢ flexibility in language

122. needS...
⇢ ability to handle server workloads
⇢ flexibility in language
⇢ a real concurrency model

123. finagle |fəˈnāgəl|
needS...
verb [ trans. ] informal
obtain (something) by devious or dishonest means : Ted
attended all the football games he could finagle tickets for.
• [ intrans. ] act in a devious or dishonest manner : they
wrangled and finagled over the fine points.
⇢ ability to handle server workloads DERIVATIVES
⇢ flexibility in language finagler |fəˈnāg(ə)lər| noun
⇢ a real concurrency model ORIGIN 1920s (originally U.S.): from dialect fainaigue
[cheat] ; perhaps from Old French fornier ‘deny.’

124. finagle |fəˈnāgəl|
needS...
verb [ trans. ] informal
obtain (something) by devious or dishonest means : Ted
attended all the football games he could finagle tickets for.
• [ intrans. ] act in a devious or dishonest manner : they
wrangled and finagled over the fine points.
⇢ ability to handle server workloads DERIVATIVES
⇢ flexibility in language finagler |fəˈnāg(ə)lər| noun
⇢ a real concurrency model ORIGIN 1920s (originally U.S.): from dialect fainaigue
[cheat] ; perhaps from Old French fornier ‘deny.’

125. finagle |fəˈnāgəl|
needS...
verb [ trans. ] informal
obtain (something) by devious or dishonest means : Ted
attended all the football games he could finagle tickets for.
• [ intrans. ] act in a devious or dishonest manner : they
wrangled and finagled over the fine points.
⇢ ability to handle server workloads DERIVATIVES
⇢ flexibility in language finagler |fəˈnāg(ə)lər| noun
⇢ a real concurrency model ORIGIN 1920s (originally U.S.): from dialect fainaigue
[cheat] ; perhaps from Old French fornier ‘deny.’

126. finagle |fəˈnāgəl|
verb [ trans. ] informal
needS... obtain (something) by devious or dishonest means : Ted
attended all the football games he could finagle tickets for.
• [ intrans. ] act in a devious or dishonest manner : they
wrangled and finagled over the fine points.
⇢ ability to handle server workloads DERIVATIVES
⇢ flexibility in language finagler |fəˈnāg(ə)lər| noun
⇢ a real concurrency model ORIGIN 1920s (originally U.S.): from dialect fainaigue
[cheat] ; perhaps from Old French fornier ‘deny.’

129. ’S Infrastructure trades in...
⇢ RAM & CPU
⇢ bandwidth
⇢ machine density

133. Switching to doesn’t imply
that is a mistake

136. is a
Real-Time Event-driven
&
Problem

138. What happens in the
World
happens on

140. Follow me at
Questions? twitter.com/raffi