I'm trying to set up hadoop on Fedora 15, I have set JAVA_HOME (ie configured
linux to see my java installation) and i have altered hadoop-env.sh so that
JAVA_HOME is set as my jdk folder, but when i enter "hadoop version" into
the terminal I get an error message saying "JAVA_HOME is not set" and I have
no idea why. I've spent a while trawling the web for similar errors but I
havent found much help. I had a look through hadoop-config.sh but I was a
little out of my depth, the section of code on Java all seemed to be fine
(logically). Entering 'echo $JAVA_HOME' in the terminal returns the correct
folder and entering 'java -version' brings up the correct info (java
1.6.0_26 etc...), so I really dont have a clue as to why entering 'hadoop
version' returns an error saying JAVA_HOME is not set.
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On Jun 11, 2011, at 6:20 AM, J3VS wrote:

>
> I'm trying to set up hadoop on Fedora 15, I have set JAVA_HOME (ie configured
> linux to see my java installation) and i have altered hadoop-env.sh so that
> JAVA_HOME is set as my jdk folder,

Check for typos.

Something else you can do is

bash -x hadoop-env.sh

to see if things get set the way you think they should be set.

Hello,
     I am installing hadoop according to this page:
https://cwiki.apache.org/BIGTOP/how-to-install-hadoop-distribution-from-bigtop.html
     I think I have successfully installed hadoop on my Ubuntu 12.04 x64.
     Then I go to step Running Hadoop, bellowing is my operation step,
why it prompts that my JAVA_HOME is not set?
------------------------------------------------------------------------------------------
root@ubuntu32:/usr/lib/hadoop# export
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/jre/bin/java
root@ubuntu32:/usr/lib/hadoop# sudo -u hdfs hadoop namenode -format
Error: JAVA_HOME is not set.
root@ubuntu32:/usr/lib/hadoop# ls $JAVA_HOME -al
-rwxr-xr-x 1 root root 5588 May  2 20:14
/usr/lib/jvm/java-7-openjdk-i386/jre/bin/java
root@ubuntu32:/usr/lib/hadoop#

------------------------------------------------------------------------------------------
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Best Regards
Ying Huang