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@raffi          Raffi KrikorianGiving a talk at @StanfordACM.Want to know about engineering forreal-time?1 min ago via Twitt...
@JordnJnkieJuice         ✔Finally✈MF✈Famous✔EARTHQUAKE !!!!!1 min ago via Echofon   Favorite   Retweet   Reply
@usgs
300 miles   to  NYC
@remedyoakland         RemedyStrawberry scones and rhubarbturnovers in the house!14 Apr via Facebook   Favorite   Retweet ...
What’s a Tweet?
48 characters                                              +1 for the birdWhat’s a Tweet?It’s a short message thats sent t...
1 tweet
sizeof(1 tweet)
sizeof(1 tweet)= 140 characters
sizeof(1 tweet)= 140 characters
sizeof(1 tweet)= 140 characters
sizeof(1 tweet)= 140 characters
sizeof(1 tweet)≈ 200 bytes
sizeof(1 tweet)≈ 200 bytes
= 140 characterssizeof(1 tweet)                ≈ 200 bytes
= 140 characterssizeof(1 tweet)                ≈ 200 bytes
@Astro_Soichi          Soichi Noguchihttp://twitpic.com/17dfqb -8 Mar 10 via TwitPic       Favorite   Retweet   Reply
@Astro_Soichi          Soichi Noguchihttp://twitpic.com/17dfqb -8 Mar 10 via TwitPic       Favorite   Retweet   Reply
AboutTweets a day
About230,000,000  Tweets a day
2.3E6 tweets    day
2.3E6 tweets 2600 tweets            ≈    day        second
2.3E6 tweets 2600 tweets            ≈    day        second
2.3E6 tweets 2600 tweets            ≈    day        second
2.3E6 tweets 2600 tweets            ≈    day        second
2.3E6 tweets 2600 tweets            ≈    day        second                       steady state
7,196TPS
Tokyo6,600 TPS
8,800 TPS
status/update
status/update
status/update
status/update    HTTP 200 OK{
status/update    HTTP 200 OK{
status/update HTTP 200 OK
status/update HTTP 200 OK
st
s
Snowflakehttps://github.com/twitter/snowflake                                       s
s
s
s
s
sRockdove
s
s
t.co
{
{
Storage          {
{
status/update    HTTP 200 OK{
status/update    HTTP 200 OK{
status/update    HTTP 200 OK{
HTTP 200 OK{    …    "text":"Tweet!"    …}
HTTP 200 OK{    …    "text":"Tweet!"    …}
HTTP 200 OK{    …    "text":"Tweet!"    …}
status/update    HTTP 200 OK{    …    "text":"Tweet!"    …}
status/update    HTTP 200 OK{    …    "text":"Tweet!"    …}
status/update    HTTP 200 OK{    …    "text":"Tweet!"    …}
status/update                      Fanout    HTTP 200 OK{    …    "text":"Tweet!"    …}
status/update                      Fanout    HTTP 200 OK{    …    "text":"Tweet!"    …}
te     FanoutK
te     FanoutK
te     FanoutK
te              Flock     FanoutK
te     FanoutK
te     FanoutK
status/update                      Fanout    HTTP 200 OK{    …    "text":"Tweet!"    …}
status/update                      Fanout    HTTP 200 OK{    …    "text":"Tweet!"    …}
followed by   following
@ladygagamother mons†er13.2 million followers@justinbieberJustin Bieber12.4 million followers@BarackObama44th President of...
@ladygagamother mons†er13.2 million followers@raffime!0.01 million followers
@ladygagamother mons†er13.2 million followers@raffime!0.01 million followers
@ladygaga       mother mons†er       13.2 million followers       @raffi       me!       0.01 million followers10000x more...
@ladygagamother mons†er13.2 million followers@raffime!0.01 million followers  scaling for            107
Has...⇢ huge number of concurrent connections⇢ lots of I/O⇢ few persistent objects
Gosai KijiPhasianus versicolor alsoknown as Japanese Pheasantis a bird of the lowlands.Closely related to theCommon Pheasa...
Gosai KijiPhasianus versicolor alsoknown as Japanese Pheasantis a bird of the lowlands.Closely related to theCommon Pheasa...
needS...⇢ ability to handle server workloads
needS...⇢ ability to handle server workloads⇢ flexibility in language
needS...⇢ ability to handle server workloads⇢ flexibility in language
needS...⇢ ability to handle server workloads⇢ flexibility in language
needS...⇢ ability to handle server workloads⇢ flexibility in language
needS...⇢ ability to handle server workloads⇢ flexibility in language
needS...⇢ ability to handle server workloads⇢ flexibility in language⇢ a real concurrency model
finagle |fəˈnāgəl|          needS...                                       verb [ trans. ] informal                       ...
finagle |fəˈnāgəl|          needS...                                       verb [ trans. ] informal                       ...
finagle |fəˈnāgəl|          needS...                                       verb [ trans. ] informal                       ...
finagle |fəˈnāgəl|                                       verb [ trans. ] informal          needS...                     ob...
’S Infrastructure trades in...⇢ RAM & CPU⇢ bandwidth⇢ machine density
Switching to      doesn’t implythat     is a mistake
is aReal-Time Event-driven         &         Problem
What happens in the    World    happens on
Follow me atQuestions?   twitter.com/raffi
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