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Idempotency
Idempotency
9 practice items · needed by 4 roles
Easy
1
Medium
3
Hard
5
Practice questions
The non-idempotent method
easy
At-least-once delivery
medium
Safe retries for payments
hard
Welcome email sent twice
hard
Duplicates from at-least-once delivery
medium
Rerunning a half-failed load
medium
Rows missed by a strict watermark
hard
Overwrite deleted the whole table
hard
Reusing an idempotency key
hard
