[Solved] You want to ensure that messages in your Pub/Sub subscription are retained for 3 days even if they are not acknowledged, but also want to avoid message... Which configuration should you apply? | GCP

GCP - Cloud Pub/Sub

You want to ensure that messages in your Pub/Sub subscription are retained for 3 days even if they are not acknowledged, but also want to avoid message duplication after acknowledgment. Which configuration should you apply?

ASet message retention duration to 0 and rely on subscriber retries.

BSet message retention duration to 3 days and disable acknowledgments.

CSet message retention duration to 7 days and never acknowledge messages.

DSet message retention duration to 3 days and ensure subscriber acknowledges messages promptly.

Step-by-Step Solution

Solution:

Step 1: Understand retention and acknowledgment roles
Retention keeps unacknowledged messages for specified time. Acknowledgment removes messages to avoid duplicates.
Step 2: Choose configuration to meet goals
Setting retention to 3 days keeps messages if unacknowledged. Prompt acknowledgment removes processed messages, preventing duplicates.
Final Answer:
Set message retention duration to 3 days and ensure subscriber acknowledges messages promptly. -> Option D
Quick Check:
Retention + prompt ack = no duplicates, messages kept [OK]

Quick Trick: Retention keeps unacked; ack removes to prevent duplicates [OK]

Common Mistakes:

Disabling acknowledgments causing duplicates
Setting retention to 0 losing unacked messages quickly
Never acknowledging causing message buildup and duplicates

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Which configuration should you apply?

Step 1: Understand retention and acknowledgment roles

Step 2: Choose configuration to meet goals

Final Answer:

Quick Check:

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