Catalog Service is the system of record for data location and lineage within Adobe Experience Platform. While all data that is ingested into Experience Platform is stored in the Data Lake as files and directories, Catalog holds the metadata and description of those files and directories for lookup and monitoring purposes.
Simply put, Catalog acts as a metadata store or “catalog” where you can find information about your data within Experience Platform. You can use Catalog to answer the following questions:
Catalog provides a RESTful API that allows you to programmatically manage Platform metadata using basic CRUD operations. See the Catalog developer guide for more information.
The resources that Catalog Service tracks are used by multiple Experience Platform services. In order to make the most of Catalog’s capabilities, it is recommended that you become familiar with these services and how they interact with Catalog.
Experience Data Model (XDM) System is the standardized framework by which Platform organizes customer experience data. Experience Platform leverages XDM schemas to describe the structure of data in a consistent and reusable way.
When data is ingested into Platform, the structure of that data is mapped to an XDM schema and stored within the Data Lake as part of a dataset. The metadata for each dataset is tracked by Catalog Service, which includes a reference to the XDM schema that the dataset conforms to.
For more general information about XDM System, please see the XDM System overview.
Experience Platform ingests data from multiple sources and persists records as datasets within the Data Lake. Catalog tracks the metadata for these datasets, regardless of their source or method of ingestion.
When using the batch ingestion method, Catalog also tracks additional metadata for batch files. Batches are units of data that consist of one or more files to be ingested as a single unit. Catalog tracks the metadata for these batch files, as well as the datasets they are persisted in after ingestion. Batch metadata includes information about the number of successfully ingested records, as well as any failed records and associated error messages.
See the data ingestion overview for more information.
As outlined in the previous section, Catalog tracks metadata for several kinds of resources and operations that are used by other Platform services. Catalog maintains its own store of “objects” which encapsulate this metadata. Catalog objects are queryable representations of Platform data which allow you to search, monitor, and label your data without needing to access the data itself.
The following table outlines the different object types supported by Catalog:
|Batches are units of data that consist of one or more files to be ingested as a single unit. A batch object in Catalog outlines the batch’s ingestion metrics (such as the number of records processed or size on disk) and may also include links to datasets, views, and other resources that were affected by the batch operation.
|A dataset is a storage and management construct used for the collection of data (typically a table) that contains a schema (columns) and fields (rows). See the datasets overview for more information.
|Dataset files represent blocks of data that has been saved on Platform. As records of literal files, these are where you can find the file’s size, the number of records it contains, and a reference to the batch that ingested the file.
This document provided an introduction to Catalog Service and how it functions within the greater scope of Experience Platform. See the Catalog developer guide for steps on interacting with the different endpoints of that Catalog API. It is recommended that you also refer to the guide on filtering Catalog data in order to follow best practices for limiting the data returned in API responses.