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The Care & Feeding of Software

Brendan McAdams
10gen, Inc.
brendan@10gen.com
@rit

Tuesday, November 27, 12

Open Source Scales
150,000

125,000

100,000

75,000

50,000

May ‘10
Jul ‘10
Sep ‘10 25,000
Nov ‘10
Jan ‘11
Mar ‘11
May ‘11
Jul ‘11
Sep ‘11
Nov ‘11
0
Jan ‘12
Mar ‘12


"In short, software is eating the world."
- Marc Andreesen
Wall Street Journal, Aug. 2011
http://on.wsj.com/XLwnmo


Software is Eating the World

• Amazon.com (and .uk, .es, etc) started as a bookstore
• Today, they sell just about everything - bicycles,
appliances, computers, TVs, etc.
• In some cities in America, they even do home grocery
delivery
• No longer as much of a physical goods company -
becoming fixated and surrounded by software
• Pioneering the eBook revolution with Kindle
• EC2 is running a huge percentage of the public
internet



• Netflix started as a company to deliver DVDs to the home...



• Netflix started as a company to deliver DVDs to the home...
• But as they’ve grown, business has shifted to an
online streaming service
• They are now rolling out rapidly in many countries
including Ireland, the UK, Canada and the Nordics
• No need for physical inventory or postal distribution ...
just servers and digital copies


Disney Found Itself Forced To Transform...

From This...


Disney Found Itself Forced To Transform...

... To This


But What Does All This Software Do?

• Software always eats data – be it text files, user form input,
emails, etc

• All things that eat, must eventually excrete...


Ingestion = Excretion

+ =

Yeast Ingests Sugars,

and Excretes Ethanol


Ingestion = Excretion

=

Cows, er...

well, you get the point.

So What Does Software Eat?

• Software always eats data – be it text files, user form input,
emails, etc

• But what does software excrete?
• More Data, of course...
• This data gets bigger and bigger
• The solutions become narrower for storing &
processing this data
• Data Fertilizes Software, in an endless cycle...


Feed & Cultivate Your Software

• If we think of Software & Data this way, cultivation, care &
feeding become crucial

• The way we cultivate good software and data?
• Good Practices
• Good Skills
• Hard Work


Don’t Tilt At Windmills...


... Or Shave Too Many Yaks


Don’t Tilt At Windmills...

• It is easy to get distracted in today’s environment
• Keep it simple
• Use tools you (and your team) can understand
• Use tools and techniques that can scale
• Try not to reinvent the wheel


... And Definitely Don’t Bite Off More Than You Can Chew

• Break work into smaller pieces
• You can’t fit a whole pig into your mouth...
• ... slice it into small parts that you can consume.


My Beginning...


Learn. Constantly.


Would You Go To a Doctor Who

Doesn’t Learn New Things?


Lack of Planning != Agile


Let’s Remember The Rules


This Includes Default Settings


The Rule is “Measure Twice, Cut Once”

https://jeffpeachey.wordpress.com/2010/07/19/measure-twice-cut-once/


Lead From The Front


Community Matters


Eat Your Own Dog Food


Eating Your Own Dog Food

for (i <- 1 to ∞)
println(“Tests. Matter.”)

• 15 years as a developer taught me this:
“Tests seem like a really good idea...
I’m tired of fixing my broken crap in production”


Bugs... and how to avoid them.


Continuous Integration Testing


Learn To Relax


¿QUESTIONS?


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