JAVA_HOME没有设置 [英] JAVA_HOME not setting

问题描述

在伪分布式操作中处理 Hadoop 实现时，我发现以下 JAVA_HOME 变量没有设置，但是当我尝试回显它时，它被设置了。

While working on Hadoop Implementation in Pseudo-Distributed Operation, I found following exception of JAVA_HOME variable not setting, but When I tried to echo it, it was set.

变量预设在 conf / hadoop-env.sh （已编辑 export JAVA_HOME = / usr / lib / jvm / java-6-sun ）， bash.bashrc 。

Variable is preset in conf/hadoop-env.sh (edited export JAVA_HOME=/usr/lib/jvm/java-6-sun), bash.bashrc.

vardan@vardan-HP-G62-Notebook-PC:~/hadoop-0.20.203.0$ echo $JAVA_HOME
/usr/lib/jvm/java-6-sun
vardan@vardan-HP-G62-Notebook-PC:~/hadoop-0.20.203.0$ bin/start-all.sh
starting namenode, logging to /home/vardan/hadoop-0.20.203.0/bin/../logs/hadoop-vardan-namenode-vardan-HP-G62-Notebook-PC.out
localhost: starting datanode, logging to /home/vardan/hadoop-0.20.203.0/bin/../logs/hadoop-vardan-datanode-vardan-HP-G62-Notebook-PC.out
localhost: Error: JAVA_HOME is not set. 
localhost: starting secondarynamenode, logging to /home/vardan/hadoop-0.20.203.0/bin/../logs/hadoop-vardan-secondarynamenode-vardan-HP-G62-Notebook-PC.out
localhost: Error: JAVA_HOME is not set. 
starting jobtracker, logging to /home/vardan/hadoop-0.20.203.0/bin/../logs/hadoop-vardan-jobtracker-vardan-HP-G62-Notebook-PC.out 
localhost: starting tasktracker, logging to /home/vardan/hadoop-0.20.203.0/bin/../logs/hadoop-vardan-tasktracker-vardan-HP-G62-Notebook-PC.out
localhost: Error: JAVA_HOME is not set.

推荐答案

检查 bin / start -all.sh 不覆盖 JAVA_HOME

可能放在执行这些二进制文件之前直接在该脚本中回显$ JAVA_HOME ？

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