Google Pub/Sub DEAD_LETTER_TOPIC_NOT_FOUND error encountered when using Google Pub/Sub.

The specified dead letter topic does not exist.

Understanding Google Pub/Sub

Google Cloud Pub/Sub is a messaging service that allows you to send and receive messages between independent applications. It is designed to provide reliable, asynchronous, and scalable messaging that decouples senders and receivers. This service is particularly useful for building event-driven architectures and integrating microservices.

Identifying the Symptom

When working with Google Pub/Sub, you might encounter the error code DEAD_LETTER_TOPIC_NOT_FOUND. This error indicates that the system is unable to locate the specified dead letter topic, which is crucial for handling messages that cannot be processed successfully.

What is a Dead Letter Topic?

A dead letter topic is a special type of topic in Google Pub/Sub where messages that cannot be delivered to subscribers are sent. This allows you to analyze and handle undeliverable messages separately from your main message flow.

Details About the Issue

The DEAD_LETTER_TOPIC_NOT_FOUND error occurs when the dead letter topic specified in your subscription's configuration does not exist. This can happen if the topic was deleted, never created, or if there is a typo in the topic name.

Common Causes

The dead letter topic was never created.
The topic name is misspelled in the subscription configuration.
The topic was deleted or is in a different project.

Steps to Fix the Issue

To resolve the DEAD_LETTER_TOPIC_NOT_FOUND error, follow these steps:

Step 1: Verify the Topic Name

Ensure that the dead letter topic name specified in your subscription configuration is correct. You can check this in the Google Cloud Console under the Pub/Sub section or by using the gcloud command-line tool.

gcloud pubsub topics list

Step 2: Create the Dead Letter Topic

If the topic does not exist, create it using the following command:

gcloud pubsub topics create YOUR_DEAD_LETTER_TOPIC_NAME

Step 3: Update the Subscription

Once the topic is created, update your subscription to use the correct dead letter topic:

gcloud pubsub subscriptions update YOUR_SUBSCRIPTION_NAME \ --dead-letter-topic=projects/YOUR_PROJECT_ID/topics/YOUR_DEAD_LETTER_TOPIC_NAME \ --max-delivery-attempts=5

Additional Resources

For more information on managing dead letter topics in Google Pub/Sub, refer to the official documentation. Additionally, you can explore the Google Pub/Sub overview to understand its features and capabilities better.

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Google Pub/Sub INVALID_SUBSCRIPTION_NAME error encountered when trying to create or manage a subscription.

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The message was not acknowledged within the configured ack deadline.

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The topic you are trying to access has been deleted.

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The system is not in a state required for the operation's execution.

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The project has exceeded its quota for the requested resource.

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The client does not have permission to access the requested resource.

Google Pub/Sub Operation aborted due to concurrency issue

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Google Pub/Sub NOT_FOUND error when accessing a Google Pub/Sub resource.

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Google Pub/Sub DEADLINE_EXCEEDED error encountered during Google Pub/Sub operations.

The operation took too long to complete.

Google Pub/Sub Operation was cancelled unexpectedly.

The operation was cancelled, typically by the caller.

Google Pub/Sub The request contains an invalid argument.

The request parameters do not conform to the API specifications.

Google Pub/Sub UNAUTHENTICATED error when accessing Google Pub/Sub.

The request does not have valid authentication credentials.

Google Pub/Sub INTERNAL error encountered during Pub/Sub operations.

An internal error occurred within the Pub/Sub service.

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