Idempotency
26 bites tagged Idempotency — interview questions with model answers, and 60-second explainers.
Analytics & Metrics2 min read
How do you ensure accurate counts with duplicate analytics events?
Tests your grasp of data integrity under at-least-once delivery. Explain why COUNT(*) is inflated, then propose deduplication using a unique event ID. Mention trade-offs of stateful processing. A red flag is ignoring the cost or the need for a unique ID.
Cloud Platforms2 min read
Idempotent Event Handlers: Don't Double-Count Events
An idempotent event handler ensures processing the same event multiple times has the same effect as processing it once. This is vital in event-driven systems to prevent data corruption from redelivered messages. The footgun is assuming exactly-once delivery.
Get Idempotency bites daily.
Five a day, five minutes, offline. With quizzes so it sticks.
Open testing — you’ll join as an early tester.