After the start Hadoop cluster solution is not Datanode

1. Turn off the cluster

stop-dfs.sh
stop-yarn.sh

2. The cluster each VERSION datanode deleted node
(VERSION datanodeid which recorded information of the path / hadoop / tmp / dfs / data / current)

cd /usr/local/hadoop/tmp/dfs/data/current/
ls
rm -f VERSION

3. Do hdfs namenode -format (format statement)

hdfs namenode -format 

4. Restart the cluster

start-dfs.sh
start-yarn.sh