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

Please control if the the tmp directory property is pointing to a valid directory in core-site.xml

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

If the directory is misconfigured, the datanode process will not start properly.