Apache Lens provides a unified OLAP cube abstraction to perform operational and exploratory analytics over both real-time and batch data stored in multiple data systems. It addresses the complexity and data silos that arise from having multiple disparate analytics systems by providing a single metadata layer and consistent mechanism for discovering and querying all data across different storage tiers and systems. Current implementations support Hive, JDBC, and deployments at InMobi and Flipkart, with ongoing work to integrate additional data sources and BI tools.