Kakao Open-Sources 'HBase Region Inspector' for Visualizing HBase Region Distribution

Kakao has released 'HBase Region Inspector', an open-source monitoring tool that provides a clear overview of region distribution and request status within HBase clusters. Developed in Clojure and React, this tool was created to overcome the limitations of the existing HBase Web UI, which only provides cumulative metrics, making relative comparisons difficult and preventing a holistic view of the status across multiple servers.

Key features include real-time visualization of distribution per region server, region size, requests per second (QPS), number of store files, and memstore size. It also offers remote management capabilities to move regions to other servers when necessary. The tool is distributed as an executable binary or JAR file for easy installation. Internally, Kakao has used it to diagnose issues such as request hotspots on specific regions or asymmetry caused by Rowkey design errors. However, it currently focuses on real-time monitoring and does not support historical tracking or long-term trend analysis.