This chapter is an outline. The curriculum, learning objectives and
structure are settled; the prose, diagrams and code are still being written.
What is below is the plan for the chapter, not the chapter.
SQS — 15 Minute Revision
Read time: 15 min
Diagram- and table-driven revision of the full course. Minimal prose by design.
Planned contents
- Architecture and the distributed storage model
- The message lifecycle diagram
- Standard queue guarantees table
- FIFO: groups, dedup, throughput math
- Delivery semantics and the idempotency strategies table
- Visibility timeout timeline diagrams
- Retry → maxReceiveCount → DLQ flow
- Long polling vs short polling table
- Batch APIs and partial failure
- Consumer concurrency and the scaling ceilings
- Capacity formulas
- Monitoring metric-signature table
- Security: identity vs resource policy
- Lambda ESM numbers
- SNS fanout
- Common failure scenarios
Design rules for this sheet
- Tables, diagrams and bullets. Prose only where a sentence genuinely beats a row
- Scannable at a glance; printable on a laptop screen
- Every quota and price links to
_reference/aws-facts.md - It answers "remind me", not "teach me" — the course body does the teaching
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