Hadoop：安装问题

Question

我已经安装了hadoop，我已经设置了JAVA_HOME，但仍然出现此错误，为什么？

/opt/hadoop/2.5.1/sbin: $JAVA_HOME
-bash: /opt/java/6.0: Is a directory
/opt/hadoop/2.5.1/sbin: ./start-dfs.sh 
Starting namenodes on [localhost]
localhost: Error: JAVA_HOME is not set and could not be found.
localhost: Error: JAVA_HOME is not set and could not be found.
Starting secondary namenodes [0.0.0.0]
0.0.0.0: Error: JAVA_HOME is not set and could not be found.
/opt/hadoop/2.5.1/sbin: 

如果我尝试：

sh start-dfs.sh 
start-dfs.sh: 82: /opt/hadoop/2.5.1/sbin/../libexec/hadoop-config.sh: Syntax error: word unexpected (expecting ")")

Answer 1

使用bash而不是sh来调用脚本。这解决了我的问题。

Answer 2

在hadoop.env.sh中打开文件hadoop-xxx/etc/hadoop并添加以下行

JAVA_HOME = "address of java"

Answer 3

您需要在.bashrc文件中设置Java Enviornment。您可能还需要更新hadoop.env.sh

中的java_home值

按照我的回答中的步骤进行操作，你的hadoop安装就可以了： [Problems with installing Hadoop on Ubuntu 12.04