Can't Handle My Scale

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Sep. 19, 2014

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Can’t Handle My Scale
@MicheleTitolo

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CODE

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Can't Handle My Scale

Sep. 19, 2014

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Scaling an app means many things. They can be human things, like "how do I stop someone from overwriting my changes to the project.pbxproj, storyboard, or xib?" Or development things, like "how do I manage dependencies?” and “why do I always have to do a 3-way merge?” Or even peripheral things like “what happens to our servers if we get featured?” and “what happens to the app when the servers go down?” This session will cover common scaling problems, and solutions to overcome them.

Computers ¯\_(ツ)_/¯

Scaling an app means many things. They can be human things, like "how do I stop someone from overwriting my changes to the project.pbxproj, storyboard, or xib?" Or development things, like "how do I manage dependencies?” and “why do I always have to do a 3-way merge?” Or even peripheral things like “what happens to our servers if we get featured?” and “what happens to the app when the servers go down?” This session will cover common scaling problems, and solutions to overcome them.

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Can't Handle My Scale

Can’t Handle My Scale @MicheleTitolo
Apps
CODE
Dozens of sub projects?
You have a dependency problem
this doesn’t mean everything has to be shared
Create internal libraries with care
version, version, version
version
3rd party code
Be picky
Any code you add, you will need to maintain
Styleguide
Establish your conventions
Enforce your conventions
… Profit!
User Experience
Users expect apps from the same companies to be similar
Developers
Our tools aren’t the best
Falling back to patching base and 3-way merge... Auto-merging MyApp.xcodeproj/project.pbxproj CONFLICT (content): Merge conflict in MyApp.xcodeproj/project.pbxproj Failed to merge in the changes. Patch failed at 0037 Launch screen images update The copy of the patch that failed is found in: /tmp/git/.git/rebase-apply/patch
via textfromxcode.com
Communication
Identify collision points
Architecture discussions
Compartmentalize
Be aware of (unknown) dependencies
Management
Help or hinderance?
Our work needs to be structured
Managers should help
If they won’t help, they will hinder
Users
Going viral is great
…but can you handle it?
500 375 250 125 0 April May June July Untitled 1 Untitled 2 Untitled 3 Time
400 300 200 100 0 April May June July Untitled 1 Untitled 2 Untitled 3 Time
Crashes
The larger your userbase, the more crashes will happen
Software isn’t perfect
Goal: limit crashes
Goal: recover from non-fatal errors
Goal: TRACK!
Servers
If your servers crash…
…how is that different than offline mode?
If possible, be ready for heavy traffic
Be ready for traffic at different times
via Flurry
Have a plan B
Services
Many services charge per user
Make sure you can afford a service
Services also tend to have caps
400 300 200 100 0 April May June July Untitled 1 Untitled 2 Untitled 3 Time
Make sure they won’t disappear (or start lying)
Customer Support
Expect ~10% of your users to contact you
More, if you have in-app feedback
Users like knowing they are heard
Someone needs to verify their reported bugs
The more obvious the bug, the more you will hear about it
Scale isn’t all bad
Scale means you’re succeeding
Scale means you’re having an impact
These are ultimately good problems to have
Thanks @MicheleTitolo