Datanode process not running in Hadoop

Question

I set up and configured a multi-node Hadoop cluster using this tutorial.

When I type in the start-all.sh command, it shows all the processes initializing properly as

Answer 1

Instead of deleting everything under the "hadoop tmp dir", you can set another one. For example, if your core-site.xml has this property:

  hadoop.tmp.dir
  /home/hduser/data/tmp

You can change this to:

  hadoop.tmp.dir
  /home/hduser/data/tmp2

and then scp core-site.xml to each node, and then "hadoop namenode -format", and then restart hadoop.