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How To Log AWS Lambda Failures Using Dead Letter Queues (DLQ)

In this article, we will discuss how to Log AWS Lambda Failures Using Dead Letter Queues (DLQ).

How Failure Is Handled By Lambda Function?

When a Lambda function is invoked asynchronously, and the function fails, AWS Lambda automatically retries the invocation twice. Specifically: -

In this article, we will invoke the lambda function asynchronously and log the failed transaction to the Dead Letter Queue.

To begin with, create a policy with SendMessage permission.

Once the policy is created, create a new role.

The next step is to create a lambda function and assign the new role.

The next step is to create a queue.

For configuration, go to the Configuration tab. Inside the tab, click on the Asynchronous Invocation.

A section appears on the right-hand side. Click on the Edit button.

The following screen will appear. Select the dead letter queue and click on the Save button.

The last step is to create a topic and a subscription. While creating the subscription, select the lambda function.

Publish the message and you can see the following output: -

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