Flow Structure and Objects
Within Trifacta® Wrangler, the basic unit for organizing your work is the flow. The following diagram illustrates the component objects of a flow and how they are related:
A flow is a container for holding one or more datasets, associated recipes and other objects. This container is a means for packaging Trifacta objects for the following types of actions:
Creating relationships between datasets, their recipes, and other datasets.
Execution of pre-configured jobs
- Creating references between recipes and external flows
Data that is imported to the platform is referenced as an imported dataset. An imported dataset is simply a reference to the original data; the data does not exist within the platform. An imported dataset can be a reference to a file, multiple files, database table, or other type of data.
NOTE: An imported dataset is a pointer to a source of data. It cannot be modified or stored within Trifacta Wrangler.
NOTE: External sources of data are not supported in Trifacta Wrangler. All sources must be uploaded files.
- An imported dataset can be referenced in recipes.
- Imported datasets are created through the Import Data Page.
- For more information on the process, see Import Basics.
After you have created an imported dataset, it becomes usable after it has been added to a flow. You can do this as part of the import process or later.
A recipe is a user-defined sequence of steps that can be applied to transform a dataset.
- A recipe object is created from an imported dataset or another recipe. You can create a recipe from a recipe to chain together recipes.
- Recipes are interpreted by Trifacta Wrangler and turned into commands that can be executed against data.
- When initially created, a recipe contains no steps. Recipes are augmented and modified using the various visual tools in the Transformer Page.
- For more information on the process, see Transform Basics.
In a flow, the following objects are associated with each recipe, which are described below:
Outputs and Publishing Destinations
Outputs contain one or more publishing destinations, which define the output format, location, and other publishing options that are applied to the results generated from a job run on the recipe.
When you select a recipe's output object in a flow, you can:
- Define the publishing destinations for outputs that are generated when the recipe is executed. Publishing destinations specify output format, location, and other publishing actions. A single recipe can have multiple publishing destinations.
- Run an on-demand job using the specified destinations. The job is immediately queued for execution.
References and Reference Datasets
References allow you to create a reference to the output of the recipe's steps in another dataset. References are not depicted in the above diagram.
When you select a recipe's reference object, you can add it to another flow. This object is then added as a reference dataset in the target flow. A reference dataset is a read-only version of the output data generated from the execution of a recipe's steps.
The following diagram illustrates the flexibility of object relationships within a flow.
|Standard job execution||Recipe 1/Job 1|
Results of the job are used to create a new imported dataset (I-Dataset 2). See Job Details Page.
|Create dataset from generated results||Recipe 2/Job 2|
Recipe 2 is created off of I-Dataset 2 and then modified. A job has been specified for it, but the results of the job are unused.
|Chaining datasets||Recipe 3/Job 3|
Recipe 3 is chained off of Recipe 2. The results of running jobs off of Recipe 2 include all of the upstream changes as specified in I-Dataset 1/Recipe1 and I-Dataset 2/Recipe 2.
|Reference dataset||Recipe 4/Job 4||I-Dataset 4 is created as a reference off of Recipe 3. It can have its own recipe, job, destinations, and results.|
Flows are created in the Flows page. See Flows Page.
Working with recipes
Recipes are edited in the Transformer page, which provides multiple methods for quickly selecting and building recipe steps.
Macros: As needed, you can create reusable sequences of steps that can be parameterized for use in other recipes. For more information, see Overview of Macros.
Run Jobs: When you are satisfied with the recipe that you have created in the Transformer page, you can execute a job. A job may be composed of one or more of the following job types:
- Transform job: Executes the set of recipe steps that you have defined against your sample(s), generating the transformed set of results across the entire dataset.
- Profile job: Optionally, you can choose to generate a visual profile of the results of your transform job. This visual profile can provide important feedback on data quality and can be a key for further refinement of your recipe.
- When a job completes, you can review the resulting data and identify data that still needs fixing. See Job Details Page.
- For more information on the process, see Running Job Basics.
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