Why erlang
Download as PPTX, PDF3 likes1,046 views
This document contains the agenda and notes from an Erlang meetup held on April 14, 2014 in Silicon Valley. The meetup included an introduction, discussions on why Erlang is useful, how WhatsApp uses Erlang, the origins and capabilities of Erlang, programming concepts in Erlang like concurrency and fault tolerance, and references for further information. The agenda included times for doors opening, introductions, presentations on why Erlang and how meetups are organized, an Erlang introduction, and doors closing.
![FUNCTIONAL
fac(N) when N == 0 -> 1;
fac(N) when N > 0 -> N*fac(N-1).
Recursion
double([H|T]) -> [2*H|double(T)];
double([]) -> [].
Pattern matching](https://image.slidesharecdn.com/whyerlang-140416132935-phpapp01/85/Why-erlang-25-320.jpg)
Why erlang
- 2. AGENDA 6:30 - Doors open 6:45 - Introduction / Announcements 7:00 - Why Erlang? 7:45 - Meetup Organization 8:15 - Erlang Intro 9:00 - Doors close
- 4. DOUG GOLDIE Freelance developer, architect, consultant Ruby, Rails stack Boatbound, V.me at Visa, Paynearme doug@codecauldron.com
- 5. WHY ERLANG? by Doug Goldie
- 6. WHATSAPP • 465M monthly users • 19B messages in & 40B out per day • Small team (~10 on Erlang), handle development and ops • ~ 550 servers + standby gear • > 11,000 cores
- 7. A YEAR AGO… • I took the summer off…. • “Why Erlang?” • Challenges of SOA • Curious about Erlang. • Learn a functional language again.
- 8. ERICSSON
- 9. TELECOM NEEDED • Concurrency • Distribution • Fault Tolerance • Soft real-time • Hot code upgrade • Incremental code loading • External interfaces
- 10. ERLANG
- 11. CONCURRENCY • Isolated processes • Asynchronous messaging passing • Actor model
- 15. Distributed
- 16. FAULT TOLERANCE Reliability Redundancy Nine nines 99.9999999%
- 17. SOFT REAL-TIME
- 18. Deadlines Soft allows some slip SOFT REAL-TIME Lightweight processes. Garbage collection
- 23. –Robert Virding, OTP class, 2014 “It’s about building Systems.”
- 24. ERLANG LANGUAGE
- 25. FUNCTIONAL fac(N) when N == 0 -> 1; fac(N) when N > 0 -> N*fac(N-1). Recursion double([H|T]) -> [2*H|double(T)]; double([]) -> []. Pattern matching
- 26. MODULES, ETC. • Modules • Behaviours
- 27. ERLANG/OTP
- 28. OTP• Library of Design Patterns • Supervision Tree • Workers and supervisors • Behaviours
- 32. ELIXIR • Jose Valim • Light layer of syntactic sugar • Pipes • Macros
- 33. THE WEB
- 34. THE WEB • Concurrent • Soft real-time • Asynchronous • Omnipresent • Internet of Things
- 36. REFERENCES • Erlang and the Web http://ninenines.eu/docs/en/cowboy/HEAD/guide/erlang_web/ • Concurrency Oriented Programming in Erlang http://www.guug.de/veranstaltungen/ffg2003/papers/ffg2003-armstrong.pdf • Why OO Sucks http://www.sics.se/~joe/bluetail/vol1/v1_oo.html • Erlang Central https://erlangcentral.org/ • Erlang History http://www.erlang.org/faq/academic.html • WhatsApp presentation http://www.erlang-factory.com/conference/show/conference-6/home/#rick-reed