What the command “hadoop namenode -format” will do

Question

I am trying to learn Hadoop by following a tutorial and trying to do pseudo-distributed mode on my machine.

My core-site.xml is:

Answer 1

Hadoop namenode -format

• Hadoop namenode directory contains the fsimage and edit files which holds the basic information's about hadoop file system such as where is data available, which user created files like that

• If you format the namenode then the above information's are deleted from namenode directory which is specified in the hdfs-site.xml as dfs.namenode.name.dir

• But you still have the datas on the hadoop but not namenode meta data