Paths/Data Engineer/Streaming & Event Pipelines / Delivery Semantics
Choose a Delivery Guarantee
Brokers promise at-least-once, and exactly-once is a promise about state, not about the wire. Write down what you promise and how you keep it.
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01Requirements
live checks- File ~/streaming/semantics.md exists○
- The document states the delivery guarantee○
- The document explains how the consumer stays idempotent○
- The document names the dead letter handling○
02Walkthrough
1 of 4 revealed- 01
State the guarantee
at-least-once means a message can arrive twice - so every consumer has to be idempotent. Promise less than the broker delivers.
echo '# Delivery semantics\n\n## Guarantee\n\nThe broker delivers at-least-once. Consumers must be idempotent.' > ~/streaming/semantics.md - 3 locked · each failed submit reveals one
03Stuck?
0 of 3 revealedTake a hint without losing the lab — each one points at the thing to look at, not at the answer.
04AI Tutor
guides, never solvesTell me what you're stuck on — I'll nudge, not solve. Which requirement are you looking at?
04Notebook
saved locally in this browserlearner@lab — ubuntu:24.04
Session is disposable
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