Hadoop安装完后，启动时报Error: JAVA_HOME is not set and could not be found.
解决办法：
修改/etc/hadoop/hadoop-env.sh中设JAVA_HOME。
应当使用绝对路径。
export JAVA_HOME=$JAVA_HOME //错误，不能这么改
export JAVA_HOME=/usr/java/jdk1.6.0_45 //正确，应该这么改
Hadoop启动报Error: JAVA_HOME is not set and could not be found解决办法
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