The Zen Of Erlang

•

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A code-free presentation about the core principles and philosophies of Erlang, explaining how the whole is greater than the sum of its parts. This presentation takes a perspective rooted in showing the reasoning between each of the building blocks (message-passing, isolated processes, links and monitors, and so on), and shows how they can be assembled together to create larger systems where interactions between subsystems take a front seat in defining the fault tolerance of these systems.

Technology

Eureka Presentation
3
BLOW 
IT UP
ROCKET SCIENCE

Eureka Presentation
4
CONTROLLED BURNS
FIGHT FIRE WITH FIRE

Eureka Presentation
6
ASYNCHRONOUS
MESSAGE PASSING

7
LINKS & 
MONITORS
CODIFYING DEPENDENCIES

Eureka Presentation
8
PREEMPTIVE 
SCHEDULING
DON’T TRUST THE DEVS

Eureka Presentation
9
FAILOVERS
NETWORK AWARE

Eureka Presentation
11
SUPERVISION 
TREES
STRUCTURE INTERACTIONS

12
Old
New
1 13 32
Old
New
1 3 1 2 3
Old
New
1 1 13 2 3
SUPERVISORS
strategies

13
WHY  
RESTARTING  
WORKS
HEISENBUGS & FRIENDS

14
REPEATABLE TRANSIENT
CORE FEATURE EASY HARD
SECONDARY
FEATURE
EASY, OFTEN
OVERLOOKED
HARD
Why restarting works
EASE OF FINDING BUGS IN DEVELOPMENT

15
REPEATABLE TRANSIENT
CORE FEATURE SHOULD NEVER ALL THE TIME
SECONDARY
FEATURE
PRETTY OFTEN ALL THE TIME
Why restarting works
BUGS THAT HAPPEN IN PRODUCTION

16
REPEATABLE TRANSIENT
CORE FEATURE NO YES
SECONDARY
FEATURE
DEPENDS YES
Why restarting works
BUGS HANDLED BY RESTARTS

17
“I LIKE STATICALLY TYPED
LANGUAGES, AND I RESTART MY
DAEMON AFTER UNHANDLED
EXCEPTIONS. WHAT IS ERLANG
GONNA WIN ME ON FAULT
TOLERANCE?”
- FORUM USER “Notorious b.s.d.”

18
ROOT
TALLY
DISTRICT
QUEBEC ONTARIO …
COUNT OCR
C_OCR
WORKER
POOL
STORAGE
CACHE
POOL
WORKER
POOL
WORKER
POOL
WORKER
WEB
SERVER
LIVE
REPORTS
SESSIONS
…
WEB
WORKER
WEB
WORKER
WEB
WORKER
SUPERVISION TREES

19
ROOT
TALLY
DISTRICT
QUEBEC ONTARIO …
COUNT OCR
C_OCR
WORKER
POOL
STORAGE
CACHE
POOL
WORKER
POOL
WORKER
POOL
WORKER
WEB
SERVER
LIVE
REPORTS
SESSIONS
…
WEB
WORKER
WEB
WORKER
WEB
WORKER
SUPERVISION TREES

20
ROOT
TALLY
DISTRICT
QUEBEC ONTARIO …
COUNT OCR
C_OCR
WORKER
POOL
STORAGE
CACHE
POOL
WORKER
POOL
WORKER
POOL
WORKER
WEB
SERVER
LIVE
REPORTS
SESSIONS
…
WEB
WORKER
WEB
WORKER
WEB
WORKER
SUPERVISION TREES
REPORT_APP
TALLY_APP
STORAGE_APP

21
but probably not…
HOPEFULLY
SLEEP AT NIGHT

23
DANGER ZONE
laid-back area
The risk of getting comfortable
WELL-DEFINED OPERATING CONDITIONS ERODE OVER TIME

Eureka Presentation
25
HOW THINGS
INTERACT
IN A NUTSHELL

27
Totally advertising free books to you all
QUESTIONS?
@MONONCQC

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The Zen Of Erlang

1. 1 FRED HEBERT THE ZEN OF ERLANG

2. 2 LET IT CRASH

3. Eureka Presentation 3 BLOW  IT UP ROCKET SCIENCE

4. Eureka Presentation 4 CONTROLLED BURNS FIGHT FIRE WITH FIRE

5. 5 PROCESSES FULLY ISOLATED

6. Eureka Presentation 6 ASYNCHRONOUS MESSAGE PASSING

7. 7 LINKS &  MONITORS CODIFYING DEPENDENCIES

8. Eureka Presentation 8 PREEMPTIVE  SCHEDULING DON’T TRUST THE DEVS

9. Eureka Presentation 9 FAILOVERS NETWORK AWARE

10. 10 LET IT CRASH

11. Eureka Presentation 11 SUPERVISION  TREES STRUCTURE INTERACTIONS

12. 12 Old New 1 13 32 Old New 1 3 1 2 3 Old New 1 1 13 2 3 SUPERVISORS strategies

13. 13 WHY   RESTARTING   WORKS HEISENBUGS & FRIENDS

14. 14 REPEATABLE TRANSIENT CORE FEATURE EASY HARD SECONDARY FEATURE EASY, OFTEN OVERLOOKED HARD Why restarting works EASE OF FINDING BUGS IN DEVELOPMENT

15. 15 REPEATABLE TRANSIENT CORE FEATURE SHOULD NEVER ALL THE TIME SECONDARY FEATURE PRETTY OFTEN ALL THE TIME Why restarting works BUGS THAT HAPPEN IN PRODUCTION

16. 16 REPEATABLE TRANSIENT CORE FEATURE NO YES SECONDARY FEATURE DEPENDS YES Why restarting works BUGS HANDLED BY RESTARTS

17. 17 “I LIKE STATICALLY TYPED LANGUAGES, AND I RESTART MY DAEMON AFTER UNHANDLED EXCEPTIONS. WHAT IS ERLANG GONNA WIN ME ON FAULT TOLERANCE?” - FORUM USER “Notorious b.s.d.”

18. 18 ROOT TALLY DISTRICT QUEBEC ONTARIO … COUNT OCR C_OCR WORKER POOL STORAGE CACHE POOL WORKER POOL WORKER POOL WORKER WEB SERVER LIVE REPORTS SESSIONS … WEB WORKER WEB WORKER WEB WORKER SUPERVISION TREES

19. 19 ROOT TALLY DISTRICT QUEBEC ONTARIO … COUNT OCR C_OCR WORKER POOL STORAGE CACHE POOL WORKER POOL WORKER POOL WORKER WEB SERVER LIVE REPORTS SESSIONS … WEB WORKER WEB WORKER WEB WORKER SUPERVISION TREES

20. 20 ROOT TALLY DISTRICT QUEBEC ONTARIO … COUNT OCR C_OCR WORKER POOL STORAGE CACHE POOL WORKER POOL WORKER POOL WORKER WEB SERVER LIVE REPORTS SESSIONS … WEB WORKER WEB WORKER WEB WORKER SUPERVISION TREES REPORT_APP TALLY_APP STORAGE_APP

21. 21 but probably not… HOPEFULLY SLEEP AT NIGHT

22. Eureka Presentation 22 EXPECT FAILURE

23. 23 DANGER ZONE laid-back area The risk of getting comfortable WELL-DEFINED OPERATING CONDITIONS ERODE OVER TIME

24.

25. Eureka Presentation 25 HOW THINGS INTERACT IN A NUTSHELL

26.

27. 27 Totally advertising free books to you all QUESTIONS? @MONONCQC

The Zen Of Erlang

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