Using HDFS Image Viewer
It is important to understand how metadata of the Namenode is stored and what changes to the filesystem have been rolled into fsimage file. The fsimage file and edits file cannot be viewed using a cat or vi editor, but needs specialized tools to do so.
Hadoop, by default, comes with utilities to view the fsimage file and edits file and, in this recipe, we will cover how to use these tools.
Getting ready
To step through the recipe in this section, we need a Hadoop cluster set up and running. The reader is encouraged to understand the Namenode metadata and its location.
How to do it...
Connect to
master1.cyrus.commaster node in the cluster and switch to userhadoop.Confirm the location of the Namenode metadata by looking into
hdfs-site.xmlfile. There will be something similar to the following, which points to the location of metadata. We will see in a later recipe how to check the value of any parameter, without opening the configuration files. To know the location of...
