Scaling Android Development Jan Chong @lessachu

2011Tardis c AntToeKnee Lacey

In Android...Honeycomb c Karunakar Rayker

Twitter for Android 2011

twitter.com 2011

20148463 c lozikiki

In Android...Jelly Belly Jelly Beans c Anne

At Twitter...

Twitter for Android 2014

Cultural challenges

Web Brain

#ShipIt

#TestIt

Clients have long lives.

“Can’t we just upgrade all the clients with this bugfix?”

Users decide when to upgrade.

Days Since Release

% Us

ers

10

20

30

40

50

60

70

80

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Immature development environment

Mobile Brain

Android Brain

Experimentation

Unified Principles

Android Education

Buy a lot of phones.

Send developers to class.

#Simplify

+

system library

twitter library

twitter for android application

Encourage participation.

Support Tooling

Experimentation framework

Feature switches

stayathomeista.com

Contributor dashboard

Eat your own dogfood.

Crashlytics

#AutomateIt

Consistent enforcement

Rapid Feedback

uiautomator

How we release

Monthly Releases

Release Trains

Release TrainsThe train(1) c Richard Taylor

Active Development

Active Development

Bug Fixing

Bake

WEEK 1

WEEK 2

WEEK 3

WEEK 4

Active Development Active Development Bug Fixing Bake

Make it cheaper to take the next train.

Streetcar ticket, 1940 c Seattle Municipal Archives

Spread change over time.

Active Development

Critical Bugfixing/Bake

WEEK N WEEK N + 1

Two Week Staged Release

Active Development

Critical Bugfixing/Bake

WEEK N

Active DevelopmentActive Development Active Development

Critical Bugfixing/BakeCritical Bugfixing/Bake Critical Bugfixing/Bake

WEEK N + 1 WEEK N + 2WEEK N - 1

Active Development

Critical Bugfixing/Bake

WEEK N WEEK N + 1

master

week n release branch

Active Development

Critical Bugfixing/Bake

WEEK N

Active DevelopmentActive Development Active Development

Critical Bugfixing/BakeCritical Bugfixing/Bake Critical Bugfixing/Bake

WEEK N + 1 WEEK N + 2WEEK N - 1

week n - 1 release branch week n release branch week n + 1 release branch

master

How do we find bugs faster?

Google Play Alpha Channel

α

ββGoogle Play Beta Channel

Active Development

Critical Bugfixing/Bake

WEEK N

Active DevelopmentActive Development Active Development

Critical Bugfixing/BakeCritical Bugfixing/Bake Critical Bugfixing/Bake

WEEK N + 1 WEEK N + 2WEEK N - 1

week n - 1 release branch week n release branch week n + 1 release branch

master

α α α

β β β

Questions? @lessachu