启动Hadoop时 报错JAVA_HOME is not set and could not be found
问题出现原因是Hadoop无法获取到jdk 解决方法： 去Hadoop中/etc/hadoop/hadoop-env.sh里进行设置 这里的配置由原先的export JAVA_HOME=${JAVA_HOME} 改为export JAVA_HOME=/opt/install/jdk1.8 （应当使用绝对路径。） 与你在环境变量中配置的jdk路径一致即可
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