Erlang - Because s**t Happens by Mahesh Paolini-Subramanya
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{ Erlang : Because S**t happens Mahesh Paolini-Subramanya (@dieswaytoofast) V.P. Ubiquiti Networks
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Mahesh talks about the buddha-nature of Erlang/OTP, pointing out how the various features of the language tie together into one seamless Fault Tolerant whole. Mahesh emphasizes that Erlang begins and ends with Fault Tolerance. Fault Tolerance is baked into the very genes of Erlang/OTP - something that ends up being amazingly useful when building any kind of system. Mahesh Paolini-Subramanya is the V.P. of R&D at Ubiquiti Networks - a manufacturer of disruptive technology platforms for emerging markets. He has spent the recent past building out Erlang-based massively concurrent Cloud Services and VoIP platforms. Mahesh was previously the CTO of Vocalocity after its merger with Aptela, where he was a founder and CTO.
Transcript of Erlang - Because s**t Happens by Mahesh Paolini-Subramanya
{
Erlang :Because S**t happens
Mahesh Paolini-Subramanya (@dieswaytoofast)V.P. Ubiquiti Networks
My Vacation
(Actually, the day before)
A small failure…
The Horror! The Horror!
Why are my calls failing?
You better call me back!
I’m still p***ed off!
And you’re stupid Apps don’t work!
The Horror! The Horror!
Surely you Tested?
1000 year floods
Fault Tolerance
Concurrency
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Concurrency
Fault detection
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Concurrency
Fault detection
Fault identification
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Concurrency
Fault detection
Fault Identification
Error Encapsulation
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
Stable Storage
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
erlang…
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
Stable Storage
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Concurrency Oriented
Concurrency Oriented
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
Stable Storage
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Fault Detection
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
Stable Storage
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Stack Traces?
Immutable Variables
X = 1.
Immutable Variables
X = 1.
X = 2.
Immutable Variables
X = 1.
X = 2.
X = X + 1.
Fault Identification
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
Stable Storage
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Let It Crash
BEAM!
Faster to create
JVM is not necessarily your friend!
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
Stable Storage
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
Code Upgrade
Live!
Hot SwappingCode Upgrade
Concurrency
Fault detection
Fault Identification
Error Encapsulation
Code upgrade
Stable Storage
The Big SixFrom http://www.erlang.org/download/armstrong_thesis_2003.pdf
The Intangibles
4x – 10x less code
Code Size
Faster to create
4x – 10x less code
Faster to create
Easier to reason about
4x – 10x less code
Faster to create
Easier to reason about
Fewer bugs
4x – 10x less code
Faster to create
Easier to reason about
Fewer bugs
Speedy refactoring
4x – 10x less code
The Shell is our friend
Live Debugging
Predictability
Performance
Fault Tolerance - Systems
Romney 2012
Fault Tolerance - Systems
Concurrency
Error encapsulation
Fault detection
Fault identification
Code upgrade
Stable Storage
The Big Six - Systems
Concurrency
Error encapsulation
Fault detection
Fault identification
Code upgrade
Stable Storage
The Big Six - Systems
Concurrency
Error encapsulation
Fault detection
Fault identification
Code upgrade
Stable Storage
The Big Six - Systems
Loose Coupling?
Breeds Trust
Loose Coupling
Loose Coupling
Breeds Trust
Devote more brainpower to specific areas
Loose Coupling
Loose Coupling
Breeds Trust
Devote more brainpower to specific areas
No. of bugs/line is constant
Loose Coupling
Performance
60 - 90% of all SW projects fail
10 – 25% of all SW projects get abandoned
Fault Tolerance
Concurrency
Error encapsulation
Fault detection
Fault identification
Code upgrade
Stable Storage
The Big Six - Systems
Monitoring?
Dashboards
Monitoring?
Dashboards
Out of band systems
Monitoring?
Supervision
Dashboards
Out of band systems
Polyglot safety
Monitoring?
Concurrency
Error encapsulation
Fault detection
Fault identification
Code upgrade
Stable Storage
The Big Six - Systems
Concurrency
Error encapsulation
Fault detection
Fault identification
Code upgrade
Stable Storage
The Big Six - Systems
Concurrency
Error encapsulation
Fault detection
Fault identification
Code upgrade
Stable Storage
The Big Six - Systems
No battle plan survives contact with the enemy
Not just about Systems
Fault Tolerance
Fault Tolerance
People
Vendors
Fault Tolerance
People
Vendors
Fraud
Fault Tolerance
The BusinessBeware the Black Swan
Is It Safe?
erlang…
[email protected] @dieswaytoofastQuestions
Coda
Active Queue Management
Queues
Queues
Queues
Queues
Can you recover quickly?
Buffer-bloat doesn’t matter, right?
Once up, can you deal with the backlog?
Back-pressure isn’t an issue, right?
Queues
Can you recover quickly?
Buffer-bloat doesn’t matter, right?
Once up, can you deal with the backlog?
Back-pressure isn’t an issue, right?
Queues
Programmable
Behavioral
Self Managed
Something’s gotta give
Tail Drop
God(category – TCP/IP)
RED
RED
Newark Airport
FRED
RED-PD
WRED
RED – Many many more
SRED RRED ARED (and Blue!) CHOKe
Special Mention
RED in a different Light
SERIOUSLY!
RED in a different Light
CoDel and fq_codel
[email protected] @dieswaytoofastQuestions
