Exactly-Once Semantics
🔴 P0 — the holy grail of distributed message processing; critical for payments
🔴 P0 — the holy grail of distributed message processing; critical for payments
🔴 P0 — the foundational impossibility result and its more nuanced successor
🔴 P0 — the craft of designing APIs; shows engineering judgement, not just pattern knowledge
🔴 P0 — appears in nearly every system design interview
🔴 P0 — DDIA Ch4 core content; underpins the gRPC proxy pattern and API versioning
🔴 P0 — foundation for reasoning about inter-service communication, latency, and failure modes
🔴 P0 — the default replication strategy for most production databases
🔴 P0 — the first data decision in every design; determines query flexibility, scaling, and consistency
🔴 P0 — the spectrum from linearisability to eventual consistency
🔴 P0 — appears in nearly every system design; the single entry point pattern