Lakehouse Batch Ingestion Workflow

Replace {{PLACEHOLDERS}} with your environment values, then deploy to your stack.

# Lakehouse Batch Ingestion Workflow

> DE Architecture · {{ORGANIZATION_NAME}}

## Overview

Batch ingestion workflow for medallion lakehouse: land raw → validate → curate → publish to consumption zone with quality gates at each transition.

## Workflow Diagram

```
 Source Systems
      │
      ▼
┌─────────────┐   quality gate   ┌─────────────┐   transform   ┌─────────────┐
│  Bronze     │ ───────────────▶ │   Silver    │ ────────────▶ │    Gold     │
│  Raw land   │   schema + vol   │  Conformed  │   aggregates  │  Marts/API  │
└─────────────┘                  └─────────────┘               └─────────────┘
      │                                │                              │
      └──────── quarantine ────────────┴─────── observability ───────┘
```

## Bronze Layer Workflow

1. **Extract** - Pull from {{SOURCE_SYSTEM}} on schedule {{CRON}}
2. **Land** - Write Parquet to `s3://{{BUCKET}}/bronze/{{DOMAIN}}/{{ENTITY}}/dt={{DATE}}/`
3. **Register** - Glue/Unity catalog table with partition keys
4. **Validate** - Row count vs source; schema hash comparison
5. **Gate** - Fail pipeline if variance > {{VARIANCE_THRESHOLD}}%

## Silver Layer Workflow

1. Read incremental bronze partitions (bookmark/watermark)
2. Apply schema enforcement and type coercion
3. Deduplicate on natural key `{{PK_COLUMN}}`
4. Apply business rules (valid enums, date ranges)
5. Write to `s3://{{BUCKET}}/silver/{{DOMAIN}}/{{ENTITY}}/`
6. Emit DQ metrics to {{OBSERVABILITY_TOOL}}

## Gold Layer Workflow

1. Aggregate/enrich silver into domain marts
2. Apply row-level security policies if needed
3. Publish to {{WAREHOUSE}} external tables or native tables
4. Notify downstream consumers via {{EVENT_BUS}}

## Operational Runbook

| Event | Action | Owner |
|-------|--------|-------|
| Schema drift | Quarantine partition, alert steward | {{DATA_STEWARD}} |
| Volume anomaly | Hold promotion to gold, investigate | {{DE_ONCALL}} |
| SLA miss | Escalate to {{ESCALATION_CONTACT}} | Platform |

## Tools Mapping

- Orchestration: {{ORCHESTRATOR}} (Airflow/Glue workflows)
- Processing: {{SPARK_ENGINE}} / dbt
- Catalog: {{CATALOG}} (Glue/Unity/Databricks)
- Quality: {{DQ_TOOL}}

## Customization

Plug in your bucket paths, domain names, PK columns, and alerting channels.