1. Pre-requisite: Environment setting

.bashrc

if [ -f /etc/bashrc ]; then

. /etc/bashrc

export HADOOP_HOME=/opt/hadoop/hadoop-2.7.2

export HADOOP_MAPRED_HOME=$HADOOP_HOME

export HADOOP_COMMON_HOME=$HADOOP_HOME

export HADOOP_HDFS_HOME=$HADOOP_HOME

export HADOOP_YARN_HOME=$HADOOP_HOME

export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

export HADOOP_PREFIX=$HADOOP_HOME

export ANT_HOME=/usr/local/apache-ant-1.9.7

export PATH=${PATH}:${ANT_HOME}/bin

export PIG_HOME=/opt/hadoop/pig-0.15.0

export PIG_HADOOP_VERSION=0.15.0

export PIG_CLASSPATH=$HADOOP_HOME/etc/hadoop

export PATH=$PATH:$PIG_HOME/bin

export PATH=$PATH:$HADOOP_HOME/bin

export HIVE_HOME=/opt/hadoop/hive

export PATH=$HIVE_HOME/bin:$PATH

export HADOOP_USER_CLASSPATH_FIRST=true

export SQOOP_HOME=/usr/lib/sqoop

export PATH=$PATH:$SQOOP_HOME/bin

every directory can be verified as below:

HADOOP_HOME: /opt/hadoop/hadoop-2.7.2