Idempotent Consumer
In plain terms
A message consumer that safely handles duplicate messages.
Going deeper
An idempotent consumer processes the same message more than once without adverse effects, essential when delivery may duplicate. Repeats cause no harm.
Under the hood
Deduplication keys or idempotent operations make at-least-once delivery safe.
Examples
At-least-once delivery, Kafka consumers, deduplication, message processing.
Think of it like...
Like a clerk who ignores a duplicate order form they've already processed.