A Brief Introduction to ErlangPhillip Trelford Lightning Talk 2012

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

Open Source Erlang

•RabbitMQ▫AMQP based messaging

•CouchDB▫Document-oriented database

•Riak▫Distributed database

•Ejabberd ▫XMPP based instant messaging (IM)

Why Erlang? Wooga Case StudyBefore After

• Social Games• Millions of daily users• 80 – 200 App Servers• 5000 – 7000 RPS

• 1 App Server*

* Actually 2 for redundancy

Blackjack functionC# Erlang

public static bool IsBlackjack(int[] ranks){ return ranks.Length == 2 && ranks[0] + ranks[1] == 21;}

isBlackjack([A,B]) when A+B==21 -> true;

isBlackjack(_) -> false.

Coding Erlang

Text Editor REPL Winning

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)].

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)

Erlang Book Stack

Next Steps

•Read ▫Learn You Some Erlang For Great Good!

•Watch▫Erlang: The Movie

•Try▫Coding Katas

•Get the T-Shirt▫#Erlang