JAVA _Home未在Hadoop中设置 [英] JAVA _Home is not set in Hadoop

问题描述

我是hadoop的初学者，试图在我的Ubuntu中安装并运行hadoop作为单个节点集群。这是我在hadoop_env.sh中的JAVA_HOME

 ＃要使用的java实现。 
 export JAVA_HOME = / usr / lib / jvm / java-7 -openjdk-i386 / 
 export HADOOP_CONF_DIR = $ {HADOOP_CONF_DIR： - / etc / hadoop} 
  
 <$> c $ c>在[localhost]上启动namenodes 
 localhost：错误：未设置JAVA_HOME并找不到。 
 localhost：错误：未设置JAVA_HOME并找不到。 
启动辅助名称节点[0.0.0.0] 
 0.0.0.0：错误：未设置JAVA_HOME并且找不到。 
  
如何移除此错误？ 
 
解决方案
我有同样的错误，并用Soil Jain的评论来解决它，但为了使它更清晰一些：hadoop-env.sh使用了一个表达式，如
  export JAVA_HOME = $ {JAVA_HOME} 
  
如果你硬编码到你的JVM安装的路径，它就可以运行 
 
 
  export JAVA_HOME = / usr / lib / jvm / java ... 
  
这个环境变量的解析似乎失败了。硬编码解决了我的问题。
 
I am a beginner with hadoop and  trying to install and run hadoop in my Ubuntu as a single node cluster. This is my JAVA_HOME in my hadoop_env.sh
# The java implementation to use.
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/
export HADOOP_CONF_DIR=${HADOOP_CONF_DIR:-"/etc/hadoop"}
But when I run it the following errors come-
Starting namenodes on [localhost]
localhost: Error: JAVA_HOME is not set and could not be found.
localhost: Error: JAVA_HOME is not set and could not be found.
Starting secondary namenodes [0.0.0.0]
0.0.0.0: Error: JAVA_HOME is not set and could not be found.
How do I remove this error?
解决方案
I had the same error and solved it with Soil Jain's remark, but to make it even a bit more clear: the hadoop-env.sh uses an expression such as
export JAVA_HOME=${JAVA_HOME}
if you hard-code the path to your JVM installation it works
export JAVA_HOME=/usr/lib/jvm/java...
this resolution by environmental variable as is seems to fail. Hard-coding fixed the problem for me.

                        
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