Check if AWS Lambda function is already running before run schedule cron

Question

I have a recurring AWS Lambda function, which is scheduled to run every 15 minutes. I would like to validate if it is running before being invoked again after 15 minutes.

Is there any AWS feature that checks this? Or will I have to develop another lambda to validate?

Answer 1

As per the AWS Documentation here, you an set the concurrency to either guarantee the that your function can reach a certain concurrency level, or, conversely, you can use concurrency to limit the maximum number of concurrent invocations.

To achieve your goal, simply set the concurrency to 1 and if there is another execution in progress your invocation will throw an exception.