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Google Pub/Sub INVALID_SUBSCRIPTION_NAME error encountered when trying to create or manage a subscription.
Understanding Google Pub/Sub
Google Cloud Pub/Sub is a messaging service designed to provide reliable, many-to-many, asynchronous messaging between applications. It enables developers to send and receive messages between independent applications, ensuring that messages are delivered in a timely and reliable manner. Pub/Sub is often used in event-driven architectures and for decoupling systems, allowing for scalable and flexible application design.
Identifying the Symptom
When working with Google Pub/Sub, you might encounter the INVALID_SUBSCRIPTION_NAME error. This error typically appears when you attempt to create or manage a subscription, and the operation fails due to an improperly formatted subscription name.
What You See
The error message will usually look something like this:
ERROR: (gcloud.pubsub.subscriptions.create) INVALID_ARGUMENT: Invalid subscription name.
This indicates that the subscription name provided does not meet the required format.
Understanding the Issue
The INVALID_SUBSCRIPTION_NAME error occurs because the subscription name does not conform to the expected naming conventions. In Google Pub/Sub, subscription names must follow a specific format to be valid.
Required Format
The correct format for a subscription name is:
projects/{project_id}/subscriptions/{subscription_name}
Here, {project_id} is your Google Cloud project ID, and {subscription_name} is the name you choose for your subscription. The subscription name must be a valid string that adheres to Pub/Sub naming rules.
Steps to Fix the Issue
To resolve the INVALID_SUBSCRIPTION_NAME error, follow these steps:
Step 1: Verify the Subscription Name Format
- Ensure that your subscription name is prefixed with
projects/{project_id}/subscriptions/. - Check that the
{subscription_name}part is a valid string. It should only contain letters, numbers, dashes, underscores, and periods. - The subscription name should not exceed 255 characters.
Step 2: Use the Correct Command
When creating a subscription via the command line, use the following command:
gcloud pubsub subscriptions create projects/{project_id}/subscriptions/{subscription_name} --topic=projects/{project_id}/topics/{topic_name}
Replace {project_id}, {subscription_name}, and {topic_name} with your actual project ID, desired subscription name, and topic name, respectively.
Step 3: Validate with the Google Cloud Console
You can also create and manage subscriptions through the Google Cloud Console. Navigate to the Pub/Sub section, and ensure that your subscription name is correctly formatted when creating a new subscription.
Additional Resources
For more information on naming conventions and best practices, refer to the Google Cloud Pub/Sub Documentation. This resource provides comprehensive guidelines on naming and managing resources in Pub/Sub.
By following these steps and ensuring your subscription names are correctly formatted, you can avoid the INVALID_SUBSCRIPTION_NAME error and successfully manage your Pub/Sub subscriptions.
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