https://github.com/drabastomek/learningPySpark
https://blog.csdn.net/whp15369657805/article/details/52016978
https://blog.csdn.net/qq_37777208/article/details/82354227
https://blog.csdn.net/jzp630641095/article/details/72743000
https://www.jianshu.com/p/b5a47e9a7df6
[root@localhost ~]# rpm -qa|grep jdk
java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
copy-jdk-configs-3.3-2.el7.noarch
java-1.7.0-openjdk-1.7.0.171-2.6.13.2.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.171-2.6.13.2.el7.x86_64
[root@localhost ~]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
[root@localhost ~]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
[root@localhost ~]# rpm -e --nodeps copy-jdk-configs-3.3-2.el7.noarch
[root@localhost ~]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.171-2.6.13.2.el7.x86_64
[root@localhost ~]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.171-2.6.13.2.el7.x86_64