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step-functions.md

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AWS Step Functions

  • Step Functions address limitations of Lambda product
  • A Lambda function has an execution time of maximum 15 minutes
  • Lambda functions can be chained together, but it is considered to be an anti-patterns and it can get messy. Lambda runtime environments are stateless
  • Step Functions is service which lets us create state machines
  • States can do things, can decide things, can take in data, modify data and output data
  • Maximum duration for state machine execution is 1 year
  • Step Functions can represent 2 different type of workflow:
    • Standard workflow: is the default and it has 1 year execution limit
    • Express workflow: designed for high volume event processing (IoT, streaming data processing and transformations), which can run up to 5 minutes
  • Step Functions can be initiated with API Gateway, IoT Rules, EventBridge, Lambda or even manually
  • State machines for Step Functions can be created with Amazon State Language (ASL) JSON templates

States

  • Type of states available:
    • SUCCEED and FAIL
    • WAIT: will wait for a certain period or time or until a date
    • CHOICE: allows a state machine to take a different path depending on an input
    • PARALLEL: allows to create parallel branches in a state machine
    • MAP: expects a list of things, for each it will perform a certain set of things
    • TASK: represents a single unit of work performed by a state machine. It can be integrated with: Lambda, Batch, DynamoDB, ECS, SNS, SQS, Glue, SageMaker, EMR, other Step Functions, etc.