hadoop java.io.IOException: while running namenode -format

Question

I ran namenode -format.This is my output. I tried changing the file permissions chmod 777 hadoop.

I believe this line is the error ERROR namenode.NameNode: java.io

Answer 1

This is a permissions issue. Either you can use 1. sudo 2. login as root

But the best solution is

sudo chown $HADOOP_HOME

hadoop namenode -format

Where HADOOP_HOME is your hadoop installation directory