AWS Step Functions

• Model your workflows as state machines
  • Useful for Order fulfillment, Data processing
  • Web applications
• Written in JSON
• Visualise and execute the workflow
• To trigger a workflow, we can use
  • SDK
  • API Gateway
  • Event Bridge
• Involves one or many States

Standard vs Express workflows

• Express workflows allow you to do short duration but a lot of execution per second
  | | Standard Workflows | Express workflows |
  | --------------------- | ---------------------------------- | -------------------------------- |
  | Maximum duration | 1 year | 5 minutes |
  | Number of execution | 2000 executions per second | > 100,000 executions per second |
  | State transition rate | 4000 state transition per second | nearly unlimited |
  | Pricing | Per state transition | Per number of executions |
  | Execution history | Step function API, CloudWatch Logs | CloudWatch Logs |
  | Execution semantics | Exactly-once workflow execution | At-least-once workflow execution |