7.
root@spark001:/usr/local# source /etc/profile
8. JAVA
#java -version java java javac
root@spark001:/usr/local# echo $JAVA_HOME #
root@spark001:/usr/local# java -version
root@spark001:/usr/local# java
root@spark001:/usr/local# javac
java -version java java javac
9. JAVA
5Hadoop
JDK
JDkmaster
spark001
1.