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Fan-Out/Fan-In Pipeline - Senior

Capacity must be bounded across the complete pipeline, not independently at each stage.

Risk Control
goroutine leak structured cancellation
slow sink bounded channel backpressure
global overload shared semaphore
one poison item explicit error policy
reordered output sequence buffer or partition-local order

Measure in-flight work, queue age, blocked sends, goroutines, memory, and downstream saturation. Inject early sink exit and timeout to prove every worker terminates.

Test yourself

  1. Why can per-stage limits exceed a global resource limit?
  2. How do you prove no worker leaked?
  3. When is unordered output preferable?

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