source: proiecte/HadoopJUnit/hadoop-0.20.1/bin/start-dfs.sh @ 142

#!/usr/bin/env bash

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# Start hadoop dfs daemons.
# Optinally upgrade or rollback dfs state.
# Run this on master node.

usage="Usage: start-dfs.sh [-upgrade|-rollback]"

bin=`dirname "$0"`
bin=`cd "$bin"; pwd`

. "$bin"/hadoop-config.sh

# get arguments
if [ $# -ge 1 ]; then
        nameStartOpt=$1
        shift
        case $nameStartOpt in
          (-upgrade)
                ;;
          (-rollback) 
                dataStartOpt=$nameStartOpt
                ;;
          (*)
                  echo $usage
                  exit 1
            ;;
        esac
fi

# start dfs daemons
# start namenode after datanodes, to minimize time namenode is up w/o data
# note: datanodes will log connection errors until namenode starts
"$bin"/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode $nameStartOpt
"$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR start datanode $dataStartOpt
"$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start secondarynamenode