localhost: Error: JAVA_HOME is not set. [Hadoop] Error: JAVA_HOME is not set

localhost: Error: JAVA_HOME is not set.

在namenode启动脚本%Hadoop_HOME%/bin/start-dfs.sh的时候发现datanode报错：

Error: JAVA_HOME is not set

原因是在%HADOOP_HOME%/conf/hadoop-env.sh内缺少JAVA_HOME的定义，只需要在hadoop-env.sh中增加：

JAVA_HOME=/your/jdk/root/path

即可

Hadoop 启动服务的时候报如下错误

：

[root@localhost hadoop-0.20.2]# start-all.sh
This script is Deprecated. Instead use start-dfs.sh and start-mapred.sh
starting namenode, logging to /home/chenwq/hadoop/hadoop-0.21.0/bin/../logs/hadoop-root-namenode-ubuntu.out
localhost: Error: JAVA_HOME is not set.
localhost: Error: JAVA_HOME is not set.
starting jobtracker, logging to /home/chenwq/hadoop/hadoop-0.21.0/bin/../logs/hadoop-root-jobtracker-ubuntu.out
localhost: Error: JAVA_HOME is not set.

解决方法：

编辑 conf/hadoop-env.sh

把 JAVA_HOME 设置为 java 安装的根路径

JAVA_HOME=/home/jdk/jdk1.6.0_16 # 这里需要根据自己的安装路径来写

时间： 2024-11-18 18:44:22

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