Google Pub/Sub INVALID_EXPIRATION_POLICY error encountered when configuring a subscription.

The expiration policy configuration is invalid.

Understanding Google Pub/Sub

Google Cloud Pub/Sub is a messaging service that allows applications to exchange messages reliably, quickly, and asynchronously. It is designed to provide real-time messaging between applications and services, enabling developers to build robust and scalable systems. Pub/Sub decouples senders and receivers, allowing for flexible and efficient communication.

Identifying the Symptom: INVALID_EXPIRATION_POLICY

When configuring a subscription in Google Pub/Sub, you might encounter the INVALID_EXPIRATION_POLICY error. This error indicates that there is an issue with the expiration policy configuration for the subscription.

What You Observe

While attempting to set or update a subscription's expiration policy, the operation fails, and you receive an error message stating INVALID_EXPIRATION_POLICY. This prevents the subscription from being created or updated as desired.

Understanding the INVALID_EXPIRATION_POLICY Issue

The INVALID_EXPIRATION_POLICY error occurs when the expiration policy for a subscription is not configured correctly. The expiration policy determines how long a subscription should be retained if it remains inactive. An invalid configuration could mean that the duration is set incorrectly or not within the acceptable range.

Common Causes

  • The expiration duration is set to a value that is not supported by Pub/Sub.
  • The configuration does not comply with the required format or constraints.

Steps to Fix the INVALID_EXPIRATION_POLICY Issue

To resolve the INVALID_EXPIRATION_POLICY error, follow these steps to ensure that your expiration policy is correctly configured:

Step 1: Review the Expiration Policy Requirements

Ensure that your expiration policy complies with the requirements outlined in the Google Cloud Pub/Sub documentation. The expiration duration must be a valid duration string, such as "86400s" for one day, and should be within the allowed range.

Step 2: Update the Expiration Policy

Use the Google Cloud Console or the gcloud command-line tool to update the subscription's expiration policy. Here is an example command to set the expiration policy using gcloud:

gcloud pubsub subscriptions update [SUBSCRIPTION_NAME] \
--expiration-period=1d

Replace [SUBSCRIPTION_NAME] with the name of your subscription and adjust the expiration period as needed.

Step 3: Verify the Configuration

After updating the expiration policy, verify that the configuration is correct by checking the subscription details. You can do this using the gcloud command:

gcloud pubsub subscriptions describe [SUBSCRIPTION_NAME]

Ensure that the expiration policy is set as expected.

Conclusion

By following these steps, you should be able to resolve the INVALID_EXPIRATION_POLICY error and successfully configure your subscription's expiration policy in Google Pub/Sub. For more detailed information, refer to the Google Cloud Pub/Sub documentation.

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