1. Format and Start HDFS

Execute these commands on the NameNode host machine:

su - hdfs
/usr/hdp/current/hadoop-hdfs-namenode/../hadoop/bin/hdfs namenode -format
/usr/hdp/current/hadoop-hdfs-namenode/../hadoop/sbin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode

Execute these commands on the SecondaryNameNode:

su - hdfs
/usr/hdp/current/hadoop-hdfs-secondarynamenode/../hadoop/sbin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start secondarynamenode

Execute these commands on all DataNodes:

su - hdfs
/usr/hdp/current/hadoop-hdfs-datanode/../hadoop/sbin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start datanode

	Note
	$HADOOP_CONF_DIR is the directory for storing the Hadoop configuration files. For example, /etc/hadoop/conf.