Everyone expects their HBase cluster to run smoothly and steadily, but the cluster does not work as expected sometimes, especially when a cluster has not been well configured. This chapter describes things you can do to troubleshoot a cluster that is running in an unexpected status.
Before you start troubleshooting a cluster, it is better to get familiar with the tools that will help us restore the cluster. Useful tools are as important as a deep knowledge of HBase and the cluster you are operating. We will introduce several recommended tools and their sample usage, in the first recipe.
Problems usually occur on a cluster that is missing the basic setup. If you encounter problems with your cluster, the first thing you should do is analyze the master log file, as the master acts as the coordinator service of the cluster. Hopefully, you will be able to identify the root cause of the error once you have found the WARN or ERROR level logs in the log file. The region server log...