The Modern Data Stack (MDS) describes the category of cloud-native, composable data tools that emerged from roughly 2016 onward to replace the previous generation of monolithic, on-premise data warehouses and proprietary ETL platforms. The MDS philosophy favors specialized, best-of-breed SaaS tools connected by standard APIs over vertically integrated platforms that lock every capability into a single vendor.
The Classic MDS Components
The canonical Modern Data Stack of 2020-2022 typically included:
- Ingestion: Fivetran or Airbyte to replicate data from SaaS sources into the warehouse.
- Storage and Compute: Snowflake or BigQuery as the destination cloud data warehouse.
- Transformation: dbt (data build tool) to write SQL-based transformation models, tested and version-controlled in Git.
- Orchestration: Airflow or Prefect to schedule and monitor pipeline DAGs.
- BI: Looker, Tableau, or Metabase to build dashboards over the transformed data.
The Lakehouse Evolution
The Modern Data Stack is evolving. The proprietary cloud warehouse at the center of the classic MDS is increasingly being replaced by the Open Lakehouse (Iceberg tables in object storage, queried through Dremio), which addresses the MDS's two primary weaknesses: storage cost and ML/AI workload support. In the evolved MDS, dbt writes transformation models to Iceberg tables rather than to Snowflake schemas, and the same Iceberg data feeds both BI dashboards and ML training pipelines without ETL duplication.
Where AI Enters
The third generation of the Modern Data Stack incorporates AI at multiple layers. AI-powered ingestion tools use LLMs to map source schemas to destination schemas automatically, reducing configuration time for new connectors. AI transformation assistants suggest dbt model code based on natural language descriptions of the desired output. AI agents query the final gold-tier Iceberg tables through the execution engine to answer business questions in real time. This AI-integrated MDS, built on an open lakehouse foundation, is the architecture that the Agentic Lakehouse represents.
