Apache Hadoop 2.0.5 alpha - start-dfs.sh (Incompatible clusterIDs)

Note: solution for 'java.io.IOException: Incompatible clusterIDs'

- 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