※ This article is reconstructed based on a portion of the book. More in-depth content (design and specific examples) is compiled in the book, so please check it out if you are interested. This book is ...

RetailFlow is a fictional mid-size e-commerce company. As the Data Engineer, your mission is to build their first cloud data platform. You will take raw, messy order data through a governed data lake, ...

In Databricks Spark UI, look for: (1) one task taking 10x longer (skew), (2) spill to disk in hundreds of GB, (3) a stage that never completes. Driver logs stay clean because executors do the work.