Hands-On Serverless Computing

App using parallel steps

This diagram illustrates an AWS Step Functions state machine that has steps that execute in parallel:

When the state machine starts for this photo processing application, it first runs the step that processes the photo and, once that has been completed, it executes three steps that run in parallel to extract the metadata from the photo, resize the image, and run the facial recognition step. Once the execution of all three parallel steps has been completed, it then loads the photo into a database and ends the execution of the state machine.