Download - Erlang - Because S**t Happens

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Erlang – because s**t happens

Erlang :

Because S**t

happensMahesh Paolini-Subramanya (@dieswaytoofast)V.P. R&D, Ubiquiti Networks

AGILITY



The Horror! The Horror!



Dude! WTF?!?!



Surely you Tested?



Fault ToleranceFrom

http://www.erlang.org/download/armstrong_thesis_2003.pdf



The Big Six

Concurrency

From




The Big Six

Concurrency

Fault detection

From




The Big Six

Concurrency

Fault detection

Fault Identification

From




The Big Six

Concurrency

Fault detection


Error Encapsulation

From




The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

From




The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




erlang…



The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




Processes!

Parallel

From




Processes!

Parallel

Independent

From




Processes!

Parallel

Independent

Asynchronous message passing

From




Processes!

Parallel

Independent


No shared state

From




Processes!

Parallel

Independent


No shared state

Immutable data structures

From




The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




** exception error: no match of

right hand side value

{error,unhappy}



The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




** exception error: no match of

right hand side value

{error,unhappy}



The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




Processes!

Let it crash

From




Processes!

Let it crash

(all the co-operating ones , that is)

From




Processes!

Let it crash


Supervisors can restart them

From




Processes!

Let it crash


Supervisors can restart them

(When necessary!)

From




The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




mnesia ‘n stuff



The Fault Tolerant System



The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From


LOOSE C

OUPLING



Loose Coupling



Loose Coupling

Breeds Trust



Loose Coupling

Breeds Trust

Devotes Brainpower appropriately



Loose Coupling

Breeds Trust

Devotes Brainpower appropriately

Minimizes bugs



Fault Tolerance

60 - 90% of all SW projects fail

10 – 25% of all SW projects get abandoned



The Big Six - Systems

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage




Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

MONIT

ORING



Monitoring?



Monitoring?Dashboards




Out of band systems




Out of band systems

Polyglot safety




Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage




Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable StoragePOLYGLO

T

PERSISTENCE



(The day it all changed)

Friday, June 29th 2012

• People

• Vendors

• Fraud

Fault Tolerance

The Business

Beware the Black Swan



The Fault Tolerant

Organization



The Big Six

Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From




Concurrency

The Big Six - Organizations



The Big Six

Concurrency

Fault detection

From




The Big Six

Concurrency

Fault detection


From




Concurrency

Error encapsulation

Fault detection




The Big Six

Concurrency

Fault detection


Error Encapsulation

From





Concurrency

Fault detection


Error Encapsulation

Code upgrade

From




Concurrency

Error encapsulation

Fault detection

Fault identification

Code upgrade





Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

From


• Concurrency

• Error encapsulation

• Fault detection

• Fault identification

• Code upgrade

• Stable Storage


Is It Safe?



Concurrency

Fault detection


Error Encapsulation

Code upgrade

Stable Storage

EVERYWHERE!!!



[email protected]

@dieswaytoofast

Download - Erlang - Because S**t Happens

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