Huolala Tech

Sep 26, 2025 · Big Data

How We Migrated 40 PB of Hive Data Across Clouds with Zero Downtime

This article details the end‑to‑end design, challenges, and implementation of a cross‑cloud migration of over 200 k Hive tables and nearly 40 PB of data using the self‑developed Kirk service, covering architecture, verification steps, and lessons learned to achieve 100 % data consistency without impacting production services.