啓動Hadoop時 報錯JAVA_HOME is not set and could not be found
問題出現原因是Hadoop無法獲取到jdk 解決方法： 去Hadoop中/etc/hadoop/hadoop-env.sh裏進行設置 這裏的配置由原先的export JAVA_HOME=${JAVA_HOME} 改爲export JAVA_HOME=/opt/install/jdk1.8 （應當使用絕對路徑。） 與你在環境變量中配置的jdk路徑一致即可
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