Design a feature that allows users to tag other users in photos they upload. Users can optionally select a rectangular region of the photo and tag it with the person. By default a small square should be picked as the region of interest.
- allow people to tag other people in photos
- region is always rectangular and user can pick how big or small the region would be
- make your high-level components operate with high availability
- ensure that the data in your system is durable, not matter what happens
- define how your system would behave while scaling-up and scaling-down
- make your system cost-effective and provide a justification for the same
- describe how capacity planning helped you made a good design decision
- think about how other services will interact with your service
- ensure the data in your system is never going in an inconsistent state
- ensure your system is free of deadlocks (if applicable)
- ensure that the throughput of your system is not affected by locking, if it does, state how it would affect
Create a design document of this system/feature stating all critical design decisions, tradeoffs, components, services, and communications. Also specify how your system handles at scale, and what will eventually become a chokepoint.
Do not create unnecessary components, just to make design look complicated. A good design is always simple and elegant. A good way to think about it is if you were to create a spearate process/machine/infra for each component and you will have to code it yourself, would you still do it?
To understand the nuances and internals of this system, build a prototype that
- design a database schema to hold people tagged in photos
- render the tagged people on different image resolutions
This is a recommended tech-stack for building this prototype
| Which | Options |
|---|---|
| Language | Golang, Java, NodeJS, C++ |
| Database | Pick your favourite |
These are the common pitfalls that you should keep in mind while you are building this prototype
- devices have different resolutions
- data representation
- database schema design
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This assignment is part of Arpit's System Design Masterclass - A masterclass that helps you become great at designing scalable, fault-tolerant, and highly available systems.