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The article explains how HBase’s meta table stores region metadata, outlines common failures such as slow startup, RIT, region holes and overlaps, and provides step‑by‑step online and offline repair procedures—including command‑line tools and configuration tweaks—for both HBase 1.x and 2.x clusters.
This article outlines the typical reasons MySQL databases crash—such as hardware failures, software issues, external attacks, and poor design—and provides practical remedies including regular backups, using myisamchk for repair, leveraging binary logs, optimizing schemas, and upgrading to newer MySQL versions.
This article explains how Zhihu adopted HDFS erasure coding to reduce storage costs, outlines cold‑hot file tiering policies, describes the EC conversion workflow and the custom EC Worker tool, and details methods for detecting and repairing damaged EC files in a Hadoop environment.