Global QSR Chain Strengthens Data Governance by Migrating to Databricks Unity Catalog

This global Quick Service Restaurant (QSR) chain with tens of thousands of restaurants was  facing challenges in governing its data in Hive Metastore across multiple workspaces. Different teams in marketing, supply chain, and operations were using the data. But inconsistent governance, scattered access controls, and limited visibility made compliance difficult and slowed down analytics.

The QSR’s ’s legacy Hive Metastore setup no longer met its growing governance and compliance needs. This slowed down the marketing team’s ability to generate customer behavior insights, which they needed to design campaigns and measure their performance. 

To address these issues, the QSR chain migrated to Databricks Unity Catalog, unifying data governance across its Databricks Lakehouse platform. 

This case study discusses the governance challenges, the rationale for migrating from Hive Metastore, the business impact, and outcome of implementing Unity Catalog.  

Challenges with the Legacy Hive Metastore  

The QSR chain collected massive volumes of customer, loyalty and sales data daily from point-of-sale (POS) systems, mobile apps, delivery platforms, and supply chain operations. However, with a Hive Metastore-based architecture, they encountered key governance bottlenecks: 

• Decentralized metadata management: Each Databricks workspace had its own Hive Metastore, leading to duplicated, inconsistent schema definitions. 

• Inadequate access control: Applying the Principle of Least Privilege was difficult, since Hive Metastore often granted access broadly at the catalog or schema level. 

• Compliance and audit gaps: Regulations such as GDPR and data residency requirements demanded clear lineage and auditability, which Hive Metastore couldn’t provide. 

• Poor discoverability: Data scientists and data engineers struggled to find the right datasets due to the absence of a unified catalog or standardized tagging. 

• Operational inefficiencies: Schema or table updates in shared Hive environments had to be repeated across multiple workspaces. This created extra maintenance work for administrators and caused delays in key project deliverables. 

Collectively, these challenges not only impeded timely product and marketing insights but also exposed the business to regulatory and reputational risks, underscoring the critical need for a unified data governance solution like Unity Catalog.  

Modernizing governance with Unity Catalog with zero downtime 

To address these challenges, the QSR partnered with Wavicle to migrate from Hive Metastore to Unity Catalog. Wavicle began with a full assessment of the business needs, existing Hive schemas, and permissions across all Databricks workspaces. The team designed a consolidated Unity Catalog structure that: 

• Centralized metadata and governance across all regions. 

• Introduced role-based access controls down to tables, views, and columns. 

• Enabled lineage tracking for critical financial and compliance reporting pipelines. 

• Standardized schema management to support near real-time updates from POS, inventory, loyalty,and customer 360 platforms. 

• Leveraged system tables for monitoring, auditing, and cost-control, giving greater visibility into usage and performance. 

• Enabled Delta Sharing for secure, real-time data collaboration across internal teams and external partners. 

• Adopted liquid clustering and predictive optimization to improve query performance and control costs on large-scale datasets. 

• Supported Lakehouse Federation, allowing analysts to query external data sources alongside the Databricks environment for a unified analytics experience. 

The implementation began by performing a one-time deep clone of all schemas and tables from Hive Metastore to Unity Catalog and subsequent periodic incremental loads during the validation period. This approach of parallel processing ensured that ongoing pipeline updates were synchronized throughout the migration and led to zero downtime.  

Results and impact 

The migration to Unity Catalog provided the QSR with: 

• Centralized governance: A single, consistent catalog across different workspaces made updates easier. Administrators no longer had to manually replicate permissions, schemas, and policies across multiple workspaces, reducing duplication of effort and the risk of inconsistencies. 

• Enhanced security and compliance: Fine-grained permissions and lineage tracking met GDPR, CCPA compliance, and internal audit requirements without additional setup.  

• Operational efficiency: Automated metadata updates reducing manual maintenance and improving data delivery speeds. 

• Performance and optimization: Liquid clustering and predictive optimization significantly improved query performance, monitoring, and cost management. System tables were leveraged to track platform usage and enforce FinOps cost controls. 

• Scalability for growth: The modern governance foundation supports advanced analytics, AI-driven demand forecasting, and personalized customer engagement at scale. 

• Seamless collaboration: Delta Sharing and Lakehouse Federation improved data accessibility and collaboration with both internal and external stakeholders. By enabling seamless access to external data sources and eliminating lengthy transfer and integration steps, project kick-offs were accelerated, allowing developers and analysts to build insights and applications much faster. 

• Cloud storage cost savings:  Consolidating the Hive Metastore silos from multiple workspaces to a centralized metastore for Unity Catalog reduced cloud storage consumption. This resulted in a lower TCO and realized cost savings of over $40K annually. There is a potential for additional savings as the other teams migrate their workspaces to the same infrastructure. 

With Wavicle’s tailored approach, the QSR not only modernized its data governance across assets but also laid the foundation for operational excellence. This conversion prepared them to tackle future growth opportunities while remaining compliant and delivering superior value to their clients.  

Wondering if Unity Catalog is the right fit for your organization? Reach out to Wavicle’s Databricks experts to explore how it can streamline your data governance and maximize the value of your platform.