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Lesson learned from production bugs that really happened to Tomer Shiri in his iOS apps. Presented at the TLV iOS Developer Meetup on 16/11/2014
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Remove before flight
Who’s to blame?
How to avoid?
Don’t release anything that has local changes
Avoid Pre release checklists completely
Avoid manual configurations
Use build configurations
avoid manual operations
Demo time
Highway 64
What when wrong?
All integers are MAX_INT
How these values age generated?
Configfile
@dynamic properties
Seems reasonable?
Whats ‘c’?
Whats ‘B’?
Solution?
That’s an edge case, man
Have you ever swizzled private methods?
Removed that annoying UIScrollView from Apple’s views?
Used KVM in order to access / change private ivars?
Don’t rely on internal implementation
The overachiever
High traffic!
Some web services stopped functioning.
Oath API getting hammered by the clients
When an API requests fails, it stops all other requests and tries to obtain a new auth_token.
When two threads tries to do that in the same time, they are failing each other.
Solution?
There is no good solution for that.
Threading bug are hard to hunt.
Use kill switches
Prepare for the worst
avoid manual operations
Everything that can compile - should compile
Don’t rely on internal implementation
Prepare for the worst
