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Why do you need to notify the state machine about it? Lambda A writes the file and only returns when the file is on S3. Lambda B will not be invoked until Lambda A finishes (assuming they are in sequence and not in a Parallel state).
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My bad, forget to mention that I am using python boto3 SDK for the lambda. When the uploading through upload_file() is finished, it returns nothing. So I am not sure that it means the files uploading are done or just S3 accepts the API call without an exception.
Should be done when it returns.