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System design

Idempotent message consumers

unwritten—Outline
Note to self
Not written yet. This is the outline I am working from — it will be filled in as I go through the topic.
  • At-least-once delivery: duplicates are guaranteed, not rare
  • Idempotency keys and a processed-messages table
  • Making handlers commutative where ordering cannot be trusted
  • Poison messages, retry policy and dead-letter handling
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