- ssh hostnameN
- vi $HADOOP_HOME/etc/hadoop/core-site.xml
- check the value of 'hadoop.tmp.dir'
- example
<property>
<name>hadoop.tmp.dir</name>
<value>/home/username/hadoop/tmp</value>
</property>
- rm /home/username/hadoop/tmp/dfs/data/current/VERSION (datanode)
- $HADOOP_HOME/sbin/start-dfs.sh