Google Pub/Sub Messages are not being delivered in the expected order.

Message ordering is not enabled for the topic.

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 independent applications, enabling developers to build robust and scalable systems. Pub/Sub is often used for event-driven architectures, data streaming, and decoupling systems.

Identifying the Symptom: ORDERING_NOT_ENABLED

When using Google Pub/Sub, you may encounter a situation where messages are not being delivered in the order they were published. This can be problematic for applications that rely on the sequence of messages to function correctly. The symptom of this issue is the unexpected order of message delivery, which can lead to inconsistent application behavior.

Explaining the Issue: ORDERING_NOT_ENABLED

The error code ORDERING_NOT_ENABLED indicates that message ordering is not enabled for the topic in question. By default, Pub/Sub does not guarantee the order of message delivery. If your application requires messages to be processed in the order they were sent, you must explicitly enable message ordering for the topic.

Why Message Ordering Matters

Message ordering is crucial for applications where the sequence of events affects the outcome. For example, in financial transactions, processing messages out of order could result in incorrect balances. Enabling message ordering ensures that messages are delivered and processed in the exact order they were published.

Steps to Fix the Issue

To resolve the ORDERING_NOT_ENABLED issue, you need to enable message ordering for your Pub/Sub topic. Follow these steps:

Step 1: Access Google Cloud Console

Navigate to the Google Cloud Console and select your project.

Step 2: Enable Message Ordering

  1. Go to the Pub/Sub section by selecting Pub/Sub from the left-hand menu.
  2. Click on Topics to view your existing topics.
  3. Select the topic for which you want to enable message ordering.
  4. Click on Edit Topic.
  5. In the topic configuration, find the Message Ordering option and enable it.
  6. Save the changes.

Step 3: Verify the Configuration

After enabling message ordering, verify that the configuration is correct by checking the topic settings in the console. Ensure that the Message Ordering option is set to Enabled.

Additional Resources

For more information on message ordering and Google Pub/Sub, refer to the following resources:

By following these steps, you can ensure that your messages are delivered in the correct order, allowing your application to function as intended.

Never debug

Google Pub/Sub

manually again

Let Dr. Droid create custom investigation plans for your infrastructure.

Book Demo
Automate Debugging for
Google Pub/Sub
See how Dr. Droid creates investigation plans for your infrastructure.

MORE ISSUES

Made with ❤️ in Bangalore & San Francisco 🏢

Doctor Droid