作者：XuYuchong 1，环境变量配置 /etc/profile exportJAVA_HOME=/opt/jdk1.8.0_40 exportCLASSPATH=:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar exportHADOOP_HOME=/opt/hadoop-3.3.0 exportPATH=$PATH:$JAVA_HOME/bin exportPATH=$PATH:/opt/hadoop-3.3.0/bin/:/op...