Offline Examination and Debugging of Messages for No-Delay Processing | CDL: Cloud Digital Leader Exam

Correct Answer: C.

Option A is Incorrect.

Exactly once processing ensures that the Pub/Sub stream is processed exactly once.

Option B is Incorrect.

The seek and replay feature of Pub/Sub can reprocess messages by facilitating point-in-time rewind of backlog.

Option C is Correct.

It allows offline examination and debugging of messages to ensure no-delay processing of other messages.

Option D is Incorrect.

Filtering enables message filtering based on message attributes.

https://cloud.google.com/pubsub

The feature of Pub/Sub that allows offline examination and debugging of messages to ensure no-delay processing of other messages is "Seek and replay."

"Seek and replay" is a feature of Google Cloud Pub/Sub that allows the consumer to seek and replay messages that have already been processed. This feature is useful when a consumer encounters an error while processing a message, and it needs to go back and reprocess it or if the consumer needs to examine and debug the message offline.

When a message is published to a topic in Pub/Sub, it is immediately available for consumption by any subscribed consumer. If a consumer encounters an error while processing a message, it can use the "Seek and replay" feature to go back to that message and reprocess it. This ensures that the processing of other messages is not delayed.

The "Seek and replay" feature works by allowing the consumer to keep track of the last message it processed. If an error occurs, the consumer can seek to the last processed message and replay it. This feature is particularly useful for long-running consumers, as it allows them to recover from errors and continue processing messages without starting from the beginning.

In contrast, "Exactly once processing" is a feature that ensures that a message is processed only once, even if it is delivered multiple times. This feature is useful for preventing duplicate processing of messages, but it does not provide the ability to seek and replay messages.

"Dead Letter topics" is a feature of Pub/Sub that allows you to specify a separate topic for messages that cannot be processed successfully. Messages that cannot be processed successfully are forwarded to the Dead Letter topic, where they can be examined and debugged offline.

"Filtering" is a feature that allows you to filter messages based on their attributes, such as their payload, metadata, or timestamp. This feature is useful for reducing the number of messages that a consumer receives, but it does not provide the ability to seek and replay messages.