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Offline Store

What is an offline store in a feature store?

The offline store in a feature store stores the historical values of features, enabling efficient and scalable access to large volumes of historical feature data for model training and batch inference. The offline store is typically implemented as a column-oriented store, which offers advantages in terms of storage efficiency, query performance, cost, and scalability.  By maintaining a comprehensive record of feature history, the offline store contributes to the reproducibility of models and allows data scientists to perform time-based analysis, identify trends, and uncover insights.

A popular offline feature store is to store feature data in an object store or distributed file system in a lakehouse file format (Apache Hudi, Delta Lake, Apache Iceberg). Another popular option is to use a data warehouse as an offline feature store.

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