The Fluid

Architecture

Your Host Tonight

Image source: my 6 yo daughter

Alex Fernández

Developer with 15+ years of experience

@pinchito

What We will cover


How to Flow


Flow with Requirements


Flow with Operational Constraints


Some Relevant Case Studies


Don't Stop Flowing

How to Flow


Turbulent Flow is Irreversible


It can be fun, but we don't want that kind of fun

Laminar Flow is Reversible


And we like when things flow smoothly!

Flow with Requirements

Circumstances Change

And you should adapt to them

Fashion in ARchitecture


80s: minicomputers & terminals


90s: client-server


00s: three tiers


10s: NoSQL

The Perfect Architecture

Does not exist

Modern Architecture


Or so we thought

Slightly More modern architecture

Spot the seven differences

Flow With Constraints


Flow with capacity planning


From 4 to 132 krps in two years

Flow for Operational Stability

From 38 to 112 krps in one day

Flow to Lower Costs


How Fast Can You Migrate


to a new cloud provider?


to a new hosting company?


to your own datacenter?


It matters because costs escalate quickly

Database migrations

are painful efforts

but shouldn't be

How to Migrate Your Database


Build a compatibility layer


Avoid downtime at all costs


Treat access and data separately


Have a reverse migration strategy


but try not to use it

Case Studies

Warning: may not apply to your situation

MediaSmart Mobile


Migration to Amazon virtual private cloud


Tried on 2015-03-03

Reversed on 2015-03-05

Due to an unrelated failure (!)


Tried again on 2015-03-11

Migrated EU on Friday the 13th

because who's afraid of superstitions?

Instagram


Migrated from AWS to Facebook datacenters


Year-long effort, from 2013-03 to ~2014-03


Had to go through AWS VPC first

Neti — a dynamic iptables manipulation daemon in Python

Three weeks into VPC, two weeks to FB


Bare minimum approach (!)

Mr X


Also migrating datacenters


Will start sending 10% of traffic

from new datacenter


Inter-datacenter latencies

Don't Stop Flowing

How to Migrate Anything


Build a compatibility layer


Avoid downtime at all costs


Have a reverse migration strategy


but try not to use it

Unstable Equilibrium

The only way to fly supersonic fighters

Living with Unstabilities


Use safe defaults


Fail safely


Always monitor

There Will Be Mistakes


Get over it

Move Fast, Break Things

Or stay put and never break anything

Or anything in between

Thanks!

@pinchito

The Fluid Architecture

By Alex Fernández

The Fluid Architecture

Charla para MadridJS, 2015-03-26

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