1. Format and Start HDFS

  1. Execute these commands on the NameNode. Login as :

    /usr/lib/hadoop/bin/hadoop namenode -format
    /usr/lib/hadoop/bin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode
  2. Execute these commands on the SecondaryNameNode. Login as$HDFS_USER :

    /usr/lib/hadoop/bin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start secondarynamenode
  3. Execute these commands on all DataNodes. Login as $HDFS_USER:

    /usr/lib/hadoop/bin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start datanode

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