The most critical component of Hadoop is Namenode, and it is important to safeguard the information it stores. It stores metadata, which is a combination of namespace and inode structure.
All the steps are to be performed as the
hadoop user. It is expected that the user has gone through Chapter 1, Hadoop Architecture and Deployment and understands the uses and function of Namenode.
You are going to need a preinstalled Hadoop as discussed in Chapter 1, Hadoop Architecture and Deployment. In the following recipes, we will configure the parameters for a copy of Hadoop that is already installed.
sshto the Namenode, which in this case is