In this recipe, we will see how to find issues with Namenode and resolve them. As this is a recipe book, we will keep the theory to a minimum, but users must understand the moto behind the commands and how the mentioned tools work.
To step through the recipes in this chapter, make sure you have gone through the steps to install Hadoop cluster with HDFS and YARN enabled. Make sure to use Multi-node Hadoop cluster for better understanding and troubleshooting practice.
It is assumed that the user has basic knowledge about networking fundamentals, Linux commands, and filesystem.
Scenario 1: Namenode not starting due to permission issues on the