Optimizing Apache HBase availability on Amazon EMR, Part 1: Coordinator startup, RegionServer recovery, and regions in transition
The gist: A repeatable process for keeping Apache HBase on Amazon EMR highly available. Part 1 covers triaging an HBase coordinator that is slow to start, a RegionServer that leaves the cluster, and regions that stay in transition, with the web UI pages, commands, and log signatures that point to each cause.