“hadoop namenode -format” returns a java.net.UnknownHostException

Question

I\'m currently learning hadoop and I\'m trying to setup a single node test as defined in http://hadoop.apache.org/common/docs/current/single_node_setup.html

I\'ve co

Answer 1

The tmp directory that you have created should have ownership issues. That is why hadoop is not able to write to the tmp directoy to fix it run the following commands

sudo chown hduser:hadoop /app/