Hadoop安裝完后，啟動時報Error: JAVA_HOME is not set and could not be found.
解決辦法：
修改/etc/hadoop/hadoop-env.sh中設JAVA_HOME。
應當使用絕對路徑。
export JAVA_HOME=$JAVA_HOME //錯誤，原來就這樣的 不該就報錯
export JAVA_HOME=/usr/java/jdk1.6.0_45 //正確，應該這么改
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