Hadoop Name Node format fails

This error occurs if you have not created the /usr/local/hadoop_store/hdfs/namenode folder or it does not have correct permission.

1. Create the directory first. Try this in terminal:

   sudo mkdir /usr/local/hadoop_store/hdfs/namenode

NOTE: Run this command as hadoop user.

2. Change permissions, if necessary.

   sudo chown -R hadoopuser:hadoopgroup /usr/local/hadoop_store/hdfs/namenode

   sudo chmod -R 777 /usr/local/hadoop_store/hdfs/namenode

Here, hadoopuser is your hadoop username and hadoopgroup is hadoop group name.

Which OS are you using on your hadoop cluster??

If you're running this on Ubuntu try this..

sudo bin/hadoop namenode -format