How to prevent concurent runs of a state machine in AWS Step Functions?

Question

Is there a way to prevent concurrent execution of AWS Step Functions state machines? For example I run state machine and if this execution is not finished and I run this machine again I get an exception.

Answer 1

You can add a step (say, with a Lambda function) which would check if the same state machine is already being executed (and in which state). If this is the case, the lambda and the step would fail.

Depending on what you want to achieve, you can additionally configure a Retry so that the execution will continue once the old state machine has finished.