mirror of
https://github.com/datahub-project/datahub.git
synced 2025-10-31 10:49:00 +00:00
56 lines
2.6 KiB
Markdown
56 lines
2.6 KiB
Markdown
import FeatureAvailability from '@site/src/components/FeatureAvailability';
|
|
|
|
# About DataHub Schema History
|
|
|
|
<FeatureAvailability/>
|
|
|
|
Schema History is a valuable tool for understanding how a Dataset changes over time and gives insight into the following cases,
|
|
along with informing Data Practitioners when these changes happened.
|
|
|
|
- A new field is added
|
|
- An existing field is removed
|
|
- An existing field changes type
|
|
|
|
Schema History uses DataHub's [Timeline API](https://datahubproject.io/docs/dev-guides/timeline/) to compute schema changes.
|
|
|
|
## Schema History Setup, Prerequisites, and Permissions
|
|
|
|
Schema History is viewable in the DataHub UI for any Dataset that has had at least one schema change. To view a Dataset, a user
|
|
must have the **View Entity Page** privilege, or be assigned to **any** DataHub Role.
|
|
|
|
## Using Schema History
|
|
|
|
You can view the Schema History for a Dataset by navigating to that Dataset's Schema Tab. As long as that Dataset has more than
|
|
one version, you can view what a Dataset looked like at any given version by using the version selector.
|
|
Here's an example from DataHub's official Demo environment with the
|
|
[Snowflake pets dataset](https://demo.datahubproject.io/dataset/urn:li:dataset:(urn:li:dataPlatform:snowflake,long_tail_companions.adoption.pets,PROD)/Schema?is_lineage_mode=false).
|
|
|
|
|
|
|
|
If you click on an older version in the selector, you'll be able to see what the schema looked like back then. Notice
|
|
the changes here to the glossary terms for the `status` field, and to the descriptions for the `created_at` and `updated_at`
|
|
fields.
|
|
|
|
|
|
|
|
In addition to this, you can also toggle the Audit view that shows you when the most recent changes were made to each field.
|
|
You can active this by clicking on the Audit icon you see above the top right of the table.
|
|
|
|
|
|
|
|
You can see here that some of these fields were added at the oldest dataset version, while some were added only at this latest
|
|
version. Some fields were even modified and had a type change at the latest version!
|
|
|
|
### GraphQL
|
|
|
|
* [getSchemaBlame](../graphql/queries.md#getSchemaBlame)
|
|
* [getSchemaVersionList](../graphql/queries.md#getSchemaVersionList)
|
|
|
|
## FAQ and Troubleshooting
|
|
|
|
**What updates are planned for the Schema History feature?**
|
|
|
|
In the future, we plan on adding the following features
|
|
- Supporting a linear timeline view where you can see what changes were made to various schema fields over time
|
|
- Adding a diff viewer that highlights the differences between two versions of a Dataset
|