A daily revenue dashboard reads from a lake fact partitioned by user_id, producing 10 million tiny p
A medium Pipeline Design mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Pipeline Design
- Difficulty
- medium
Interview Prompt
A daily revenue dashboard reads from a lake fact partitioned by user_id, producing 10 million tiny per-user directories. Daily-filter queries cannot prune because the partition key does not match the filter. Apply the section's partitioning framing and replace the wrong partition key with a section-named canonical date key. The high-cardinality key belongs on a clustering key, not a partition key.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your pipeline design solution with real code execution
- Get instant feedback and a hire/no-hire decision