Java Architect Handbook

Jul 29, 2026 · Big Data

What Is Data Skew in Distributed Computing, Its Impact, and How to Fix It

The article defines data skew as an uneven key distribution after shuffle that makes a few tasks handle most of the data, explains the resulting slowdown, OOM, low resource utilization and job failure, and then details diagnosis methods and concrete solutions for group‑by, join, null‑value and framework‑level scenarios.