Postgres
Featureform supports Postgres as an Offline Store.
Implementation
Primary Sources
Tables
Table sources are used directly via a view. Featureform will never write to a primary source.
Transformation Sources
SQL transformations are used to create a view. By default, those views are materialized and updated according to the schedule parameter. Deprecated transformations are converted to un-materialized views to save storage space.
Offline to Inference Store Materialization
When a feature is registered, Featureform creates an internal transformation to get the newest value of every feature and its associated entity. A Kubernetes job is then kicked off to sync this up with the Inference store.
Training Set Generation
Every registered feature and label is associated with a view table. That view contains three columns, the entity, value, and timestamp. When a training set is registered, it is created as a materialized view via a JOIN on the corresponding label and feature views.
Configuration
First we have to add a declarative Postgres configuration in Python.
postgres_config.py
import featureform as ff
ff.register_postgres(
name = "postgres_docs",
description = "Example offline store store",
team = "Featureform",
host = "0.0.0.0",
port = "5432",
user = "postgres",
password = "password",
database = "postgres",
)
Once our config file is complete, we can apply it to our Featureform deployment
featureform apply postgres_config.py --host $FEATUREFORM_HOST
We can re-verify that the provider is created by checking the Providers tab of the Feature Registry.
Mutable Configuration Fields
-
description
-
username
-
password
-
port