iainjames88 commented on issue #5914: [AIRFLOW-5311] Add an AWS Lambda Operator URL: https://github.com/apache/airflow/pull/5914#issuecomment-524823685 So, looking at the code again I don't think this will handle asynchronous calls to Lambda very well, if at all. See that [invocation_type](https://github.com/apache/airflow/blob/c92181226170a015813a34daecb43df3052c0cdf/airflow/contrib/hooks/aws_lambda_hook.py#L48) may be `RequestResponse` for a synchronous call or `Event` for an asyncrhonous call. Some info [here](https://docs.aws.amazon.com/lambda/latest/dg/lambda-invocation.html). For my use case making synchronous calls is fine so I've been using the default "RequestResponse" invocation type. I think I am going to remove the `invocation_type` constructor param and let this be a simple synchronous operator. I can follow up with another PR to add support for asynchronous calls, later.
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