The Same Stream Twice

A hard Pipeline Design interview practice problem on DataDriven. Write and execute real pipeline design code with instant grading.

Domain

Pipeline Design

Difficulty

hard

Seniority

senior

Problem

A global streaming-video platform collects about 2 billion playback heartbeat events a day from 150 million subscribers, and two teams read the same feed: reliability needs rebuffering spikes per title and region surfaced within seconds so on-call can be paged, while finance pays studios royalties on exact minutes-watched and cannot tolerate a single double-counted or dropped event. Design the pipeline so both teams consume the same durable ingest independently, with the live alerting path running approximate and fast while the daily royalty report counts each raw event exactly once instead of reusing the live aggregation. Keep a malformed heartbeat from a bad device build from stalling the live path.

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