Retries Without DuplicatesKafka · medium · ~10 minAfter the network team's maintenance window (brief packet loss every few minutes for an hour), the metrics-events topic shows ~18k duplicated records. The producer runs acks=all, retries=10 — and the duplicates all pair with producer retry warnings.Explain the mechanism precisely, then fix it with one flag — and know exactly what that flag does and doesn't promise.Evidence

Evidence

Config

Checkpoints

Mechanically, where does a retry duplicate come from with acks=all?

What does enable.idempotence=true actually do?

A teammate says 'great, idempotence is on, we have exactly-once everywhere'. Correct them, interview-style.