What should the developer do to ensure that the Lambda function does not process duplicate messages?
Configure the Lambda function with a larger amount of memory.
Configure an increase in the Lambda function’s timeout value.
Configure the SQS queue’s delivery delay value to be greater than the maximum time it takes to call the third-party API.
Configure the SQS queue’s visibility timeout value to be greater than the maximum time it takes to call the third-party API.
Explanations:
Increasing the memory allocation does not directly address the issue of processing duplicate messages. The root cause is related to the Lambda function’s execution timeout, not its memory allocation.
Increasing the Lambda function’s timeout would not solve the duplicate message issue because the Lambda function would still time out if the third-party API takes too long. The issue lies in ensuring the Lambda function finishes processing before the message is reprocessed.
The SQS queue’s delivery delay only affects the delay before messages are available for processing. It does not address the issue of duplicate processing due to the Lambda function’s execution timing.
Configuring the SQS queue’s visibility timeout to be greater than the maximum time it takes to call the third-party API ensures that once a message is being processed by a Lambda function, it will not be picked up by another instance of the function until it completes. This prevents duplicate processing.
I opine that the answer is:
Configure the SQS queue’s visibility timeout value to be greater than the maximum time it takes to call the third-party API.