At-Least-Once Delivery — Google Cloud Professional Cloud Architect Practice Questions
At-least-once delivery is a messaging guarantee where the system ensures every message is delivered to a consumer one or more times, accepting the possibility of duplicates rather than risking message loss. On the Google Cloud Professional Cloud Architect exam, this concept is central to understanding Cloud Pub/Sub's default delivery semantics and the requirement that consuming applications implement idempotency to handle repeated processing safely. The exam tests architects' ability to design downstream services that tolerate duplicate messages, using techniques such as deduplication keys or idempotent database writes. Choosing the right delivery guarantee, and designing consumers appropriately, is a practical skill tested across data pipeline and event-driven architecture questions.
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- Your application needs to process 10 million events per second with guaranteed delivery and at-least-once semantics. What is the best messaging service? Unlock answer & explanation →