Qunar Tech Salon

Apr 17, 2018 · Big Data

HDFS DataNode Volume Choosing Policies: Round‑Robin and Available‑Space Strategies

This article explains how HDFS DataNode stores data blocks on local disks, detailing the configuration of storage directories, the two volume‑choosing policies (round‑robin and available‑space), their implementation via the VolumeChoosingPolicy interface, and the logic used to balance disk usage.