Serverless Workflows on AWS: My Journey From SWF to Step Functions

AWS Lambda functions can only run for a maximum of five minutes. This must be distinctly understood, or nothing wonderful can come of the story you are about to hear.

The Problem

This past summer, my team and I set out to build an internal software system used for deployment testing on AWS. The application would run a large number of workflow executions in parallel each night and might perform a few one-off executions during the day – maybe six hours total use out of every twenty-four, with only a small fraction of that time spent doing actual compute tasks. Trying to scale, manage and spend money on EC2 instances for that workload didn’t interest us. We wanted to run our whole workflow process end-to-end on AWS Lambda.

And we did. Heaven help us, we did. This is our story.

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Serverless Workflows on AWS: My Journey From SWF to Step Functions