vi /etc/profile
JAVA_HOME=/usr/java/jdk1.
8.0_131
CLASSPATH=.:
$JAVA_HOME/lib/dt.jar:
$JAVA_HOME/lib/tools.jar
SCALA_HOME=/usr/local/scala-
2.10.
3/
HADOOP_HOME=/usr/local/hadoop-
2.7.
3/
SPARK_HOME=/usr/local/spark-
2.1.
1-bin-hadoop2.
7/
PATH=
$JAVA_HOME/bin:
$SCALA_HOME/bin:
$PATH
export JAVA_HOME
export SPARK_HOME
export HADOOP_HOME
export SCALA_HOME
export PATH
