VuTrinh (Substack)

Parquet Fundamentals in 3 Mins

The episode explains how Apache Parquet’s hybrid columnar‑row format optimizes storage and query performance for large datasets. It contrasts row‑wise and pure columnar layouts, highlighting the inefficiencies of each, and then describes Parquet’s structure of row groups, column chunks, and pages, along with its self‑describing metadata that enables column pruning and efficient reads. The host also notes Parquet’s origins at Twitter and Cloudera and points listeners to a newsletter for deeper data‑engineering content.