SYSTEM-DESIGN-BASICS5 MIN READ
Idempotency Across Retries
Make a converging sequence of design decisions for idempotency across retries.
Pressure moment Luis sees duplicate subscription charges after every layer retried “safely” without duplicate suppression. The first fork determines every later trade-off. Decision walk Patterns of Distributed Systems: Idempotent Receiver Follow invariant, boundary, and recovery in order. Shortcut Pick a tool first. A defensible recommendation 01 Invariant 02 Boundary 03 Recovery Step 1 What is the first call? Step 2
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