tracing-downstream-lineage
Trace downstream data lineage to assess change impact before modifying tables or DAGs.
- Identifies direct consumers of a target table or DAG through source code search, view dependencies, and BI tool connections
- Builds a full dependency tree mapping all downstream impacts, from tables to dashboards to ML models
- Categorizes dependencies by criticality (critical, high, medium, low) to prioritize stakeholder communication and testing
- Generates an impact report with risk assessment, affected owners, and recommended mitigation steps before deployment
Downstream Lineage: Impacts
Answer the critical question: "What breaks if I change this?"
Use this BEFORE making changes to understand the blast radius.
Impact Analysis
Step 1: Identify Direct Consumers
Find everything that reads from this target:
For Tables:
- Search DAG source code: Look for DAGs that SELECT from this table
- Use
af dags listto get all DAGs - Use
af dags source <dag_id>to search for table references - Look for:
FROM target_table,JOIN target_table
- Use
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