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

Following steps resolved my problem -

1- sudo su

Enter your password.

2-/usr/local/hadoop/bin/hdfs namenode -format.

This has been done for hadoop2.5 in which "hadoop namenode -format" has beendeprecated hence using "hdfs namenode -format"