The document discusses LinkedIn's data ecosystem and the challenge of bridging operational transactional data (OLTP) with analytical processing (OLAP) at scale. It describes LinkedIn's solution called Lumos, which is a scalable ETL framework that uses change data capture, delta processing, and virtual snapshots to frequently refresh petabyte-scale data from OLTP databases into Hadoop for OLAP. Lumos supports requirements like handling multiple data centers, schema evolution, and efficient change capture while ensuring data consistency and low latency refresh times.