A Brief Introduction To Erlang - Lighting Talk

1. A Brief Introduction to Erlang
Phillip Trelford
Lightning Talk 2012

2. Erlang in Industry
• Amazon
▫ SimpleDB for Amazon Elastic Compute Cloud (EC2)
• Yahoo!
▫ Delicious social bookmarking (50 million users)
• Facebook
▫ Chat service (100 million users)
• T-Mobile
▫ SMS and authentication systems
• Ericsson
▫ Support nodes in GPRS & 3G mobile networks

3. Open Source Erlang
• RabbitMQ
▫ AMQP based messaging
• CouchDB
▫ Document-oriented database
• Riak
▫ Distributed database
• Ejabberd
▫ XMPP based instant messaging (IM)

4. Why Erlang? Wooga Case Study
Before After
• Social Games • 1 App Server*
• Millions of daily users
• 80 – 200 App Servers
• 5000 – 7000 RPS
* Actually 2 for redundancy

5. Blackjack function
C# Erlang
public static isBlackjack([A,B]) when A+B==21 ->
bool IsBlackjack(int[] ranks) true;
{ isBlackjack(_) ->
return false.
ranks.Length == 2 &&
ranks[0] + ranks[1] == 21;
}

6. Coding Erlang
Text
REPL Winning
Editor

7. Card Shuffle in Erlang REPL
Ranks=["A","1","2","3","10","J","Q","K"].
Suits=[clubs,diamonds,hearts,spades].
Deck=[{Rank,Suit}||Rank<-Ranks,Suit<-Suits].
Tuples=[{random:uniform(),Card}||Card<-Deck].
[Card||{_,Card}<-lists:keysort(1,Tuples)].

8. Why learn Erlang?
• Money
▫ Erlang will instantly net you a $100,000 salary
• Power
▫ 99.9999999% Reliability
• Respect
▫ Scala Akka
▫ F# Agents
▫ TPL DataFlow (TDF)

9. Erlang Book Stack

10. Next Steps
• Read
▫ Learn You Some Erlang For Great Good!
• Watch
▫ Erlang: The Movie
• Try
▫ Coding Katas
• Get the T-Shirt
▫ #Erlang