Map state input and output fields in Step Functions

Map states concurrently iterate over a collection of items in a dataset, such as a JSON array, a list of Amazon S3 objects, or the rows of a CSV file in an Amazon S3 bucket. It repeats a set of steps for each item in the collection. You can configure the input that the Map state receives and the output it generates using these fields. Step Functions applies each field in your Distributed Map state in the order shown in the following list and illustration:

Note

Based on your use case, you may not need to apply all of these fields.

1. ItemReader (Map)

2. ItemsPath (Map)

3. ItemSelector (Map)

4. ItemBatcher (Map)

5. ResultWriter (Map)

Note

These Map state input and output fields are currently unavailable in the data flow simulator in the Step Functions console.