[Solved] A developer wrote this code snippet to acknowledge messages but messages keep getting redelivered. What is the likely error? def callback(message): print(message.data) # missing acknowledgment call | GCP

GCP - Cloud Pub/Sub

A developer wrote this code snippet to acknowledge messages but messages keep getting redelivered. What is the likely error?

def callback(message):
    print(message.data)
    # missing acknowledgment call

AThe client library is outdated

BThe subscription does not exist

CThe message data is empty

DThe callback function does not call message.ack()

Step-by-Step Solution

Solution:

Step 1: Analyze callback function
The callback prints message data but does not acknowledge the message.
Step 2: Understand consequence of missing ack
Without calling message.ack(), Pub/Sub assumes message was not processed and redelivers it.
Final Answer:
The callback function does not call message.ack() -> Option D
Quick Check:
Missing message.ack() causes redelivery [OK]

Quick Trick: Always call message.ack() in callback to stop redelivery [OK]

Common Mistakes:

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A developer wrote this code snippet to acknowledge messages but messages keep getting redelivered. What is the likely error?