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A key challenge that Lambda developers often face is to create solutions that handle exceptions and failures gracefully. Notifying operations support when a function fails with context Sending jobs that have timed out to a handler that can either notify operations of a critical failure or rebalance jobs Now, with the release of Lambda Dead Letter Queues, Lambda functions can be configured to notify when the function fails, with context on what the failure was.
In this post, we show how you can configure your function to deliver notification to an Amazon SQS queue or Amazon SNS topic, and how you can create a process to automatically generate more meaningful notifications when your Lambda functions fail.
Introducing Lambda Dead Letter Queues Dead-letter queues are a powerful concept, which help software developers find software issue patterns in their asynchronous processing components.
The way it works is simple—when your messaging component receives a message and detects a fatal or unhandled error while processing the message, it sends information about the message that failed to another location, such as another queue or another notification system.
The Lambda service sends information about the failed request when the request will no longer be retried. The transcoding Lambda function can be configured to send any transcoding failures to an SNS topic, which triggers a Lambda function for further investigation.
Now, you can set up a dead letter queue for an existing Lambda function and test out the feature.
For this demo, use the sns-lambda-test topic. An example is provided below: Next, choose an existing Lambda function against which to configure a dead-letter queue. For this example, choose a predeployed function, such as CreateThumbnail. Processing failure notifications One easy way to test the handler for your dead letter queue is to submit an event that is known to fail for the Lambda function.
In this example, you can simply drop a text file pretending to be an image to the S3 bucket, to be recognized by the image thumbnail creator as a non-image file, and have the handler exit with an error message. When Lambda sends an error notification to an SNS topic, three additional message attributes are attached to the notification in the MessageAttributes object: ErrorMessage — The error message given back by the Lambda runtime.
In the example above, it is the error message from the handler. In addition to these attributes, the body of the event is held in the Message attribute of the Sns object.
If you use an SQS queue instead, the additional attributes are in the MessageAttributes object and the event body is held in the Body attribute of the message. Handling timeouts One of the most common failures to occur in Lambda functions is a timeout.
Handling critical failures Another scenario that you may need to handle is when critical failures occur. Some examples of a critical failure are: These kinds of errors can be forwarded to operations support for root cause analysis or break glass fixes.
In the case of a system crash, your dead letter queue receives an error message similar to the following: In the case of a misconfiguration, your dead letter queue receives an error message along the following lines: Conclusion With the launch of Dead Letter Queues, Lambda function developers can now create much simpler functions by focusing only on the business logic, and leverage the AWS Lambda infrastructure to delegate error handling elsewhere in a more graceful manner.
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