I'm just starting out with AWS Step Functions and I'm trying to set up a workflow that runs an Athena query followed by processing the results. However, I'm stuck on a crucial part: how to manage the waiting time for the Athena query to finish. Should I have Step 2 wait for the query to complete by polling, or should I set it up to be triggered by an S3 event notification once the results are stored? If I choose the S3 notification method, I'm unclear about how it fits into the Step Functions workflow since it seems like Step 2 would then be an external trigger and not part of the same execution. Plus, I've received an error stating that Step 2 must rely on a previous state, which confuses me further. Am I looking at this the wrong way?
4 Answers
You don't have to worry about polling or external triggers here. Instead, go with the .sync integration pattern in AWS Step Functions. It automatically handles the waiting for your Athena query to finish, which simplifies the process for you! Check out the documentation for more details: https://docs.aws.amazon.com/step-functions/latest/dg/connect-to-resource.html#connect-sync.
You might want to check out Logverz, which is a lightweight, serverless data pipeline. You can set it up quickly using CloudFormation. It can handle your SQL queries automatically and route the data to an RDS database. Watch this demo for an idea of how it works! [https://youtu.be/AzYY4vYJpmU?si=8El4ns1mv9whpGno](https://youtu.be/AzYY4vYJpmU?si=8El4ns1mv9whpGno) Just a disclaimer—I'm one of the developers behind Logverz.
If your needs are relatively simple, I'd recommend executing the Athena query with EventBridge and then following up with an S3 event notification that triggers a Lambda function. This way, you can avoid the complexities of managing state within Step Functions for this basic workflow.
Hey, just a thought: the .sync integration pattern fits perfectly for your case! By the way, when you mention processing the results, how extensive are those results and what kind of processing do you plan to do? It might help to clarify your needs.
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