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#

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

I think you should set  JAVA_HOME=/usr/lib/jvm/java-7-**openjdk-i386/jre

JAVA_HOME is the base location of java, where it can find the java
executable $JAVA_HOME/bin/java

Regards,
Simon
On Thu, Jul 5, 2012 at 12:42 PM, Ying Huang <[EMAIL PROTECTED]> wrote:

> Hello,
>     I am installing hadoop according to this page:
> https://cwiki.apache.org/**BIGTOP/how-to-install-hadoop-**
> distribution-from-bigtop.html<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#
>
> ------------------------------**------------------------------**
> ------------------------------
>
>
> --
>
>
> Best Regards
> Ying Huang
>
>

According to your suggestion, I try following command, but still fail:
--------------------------------------------------------------------
root@ubuntu32:/usr/lib/hadoop# export
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/jre
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
total 20
drwxr-xr-x 5 root root 4096 Jul  3 20:43 .
drwxr-xr-x 5 root root 4096 Jul  3 20:43 ..
lrwxrwxrwx 1 root root   50 May  2 20:14 ASSEMBLY_EXCEPTION ->
../../java-7-openjdk-common/jre/ASSEMBLY_EXCEPTION
drwxr-xr-x 2 root root 4096 Jul  3 20:43 bin
drwxr-xr-x 8 root root 4096 Jul  3 20:43 lib
drwxr-xr-x 4 root root 4096 Jul  3 20:43 man
lrwxrwxrwx 1 root root   50 May  2 20:14 THIRD_PARTY_README ->
../../java-7-openjdk-common/jre/THIRD_PARTY_README
root@ubuntu32:/usr/lib/hadoop#

--------------------------------------------------------------------
On 07/05/2012 11:53 AM, Simon wrote:
> I think you should set JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/jre
>
> JAVA_HOME is the base location of java, where it can find the java
> executable $JAVA_HOME/bin/java
>
> Regards,
> Simon
>
>
> On Thu, Jul 5, 2012 at 12:42 PM, Ying Huang <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
>     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#
>
>     ------------------------------------------------------------------------------------------
>
>
>     --
>
>
>     Best Regards
>     Ying Huang
>
>
--
Best Regards
Ying Huang

JAVA_HOME is set for user root but not for user hdfs. Make sure JAVA_HOME is set for user hdfs and then try the command again.

--
Arpit Gupta
Hortonworks Inc.
http://hortonworks.com/

On Jul 5, 2012, at 9:42 AM, Ying Huang wrote:

> 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#
>
> ------------------------------------------------------------------------------------------
>
>
> --
>
>
> Best Regards
> Ying Huang
>

Did you configure JAVA_HOME in file hadoop-env.sh?

Simon
On Thu, Jul 5, 2012 at 1:02 PM, Ying Huang <[EMAIL PROTECTED]> wrote:

>  According to your suggestion, I try following command, but still fail:
> --------------------------------------------------------------------
> root@ubuntu32:/usr/lib/hadoop# export
> JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/jre
>
> 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
> total 20
> drwxr-xr-x 5 root root 4096 Jul  3 20:43 .
> drwxr-xr-x 5 root root 4096 Jul  3 20:43 ..
> lrwxrwxrwx 1 root root   50 May  2 20:14 ASSEMBLY_EXCEPTION ->
> ../../java-7-openjdk-common/jre/ASSEMBLY_EXCEPTION
> drwxr-xr-x 2 root root 4096 Jul  3 20:43 bin
> drwxr-xr-x 8 root root 4096 Jul  3 20:43 lib
> drwxr-xr-x 4 root root 4096 Jul  3 20:43 man
> lrwxrwxrwx 1 root root   50 May  2 20:14 THIRD_PARTY_README ->
> ../../java-7-openjdk-common/jre/THIRD_PARTY_README
> root@ubuntu32:/usr/lib/hadoop#
>
> --------------------------------------------------------------------
>
> On 07/05/2012 11:53 AM, Simon wrote:
>
> I think you should set  JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/jre
>
>  JAVA_HOME is the base location of java, where it can find the java
> executable $JAVA_HOME/bin/java
>
>  Regards,
> Simon
>
>
> On Thu, Jul 5, 2012 at 12:42 PM, Ying Huang <[EMAIL PROTECTED]> wrote:
>
>> 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#
>>
>>
>> ------------------------------------------------------------------------------------------
>>
>>
>> --
>>
>>
>> Best Regards
>> Ying Huang
>>
>>
>
>
> --
>
>
> Best Regards
> Ying Huang
>
>

I don't think OpenJDK is supported. There were a lot of problems with it.

But feel free to give it a try,  if you run into JVM crashes. Use Oracle(Sun) JDK 6. (NOT 7)
Harsh had a good post before regarding the JVM(s).

-----Original Message-----
From: Simon [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 05, 2012 9:53 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: JAVA_HOME is not set

I think you should set  JAVA_HOME=/usr/lib/jvm/java-7-**openjdk-i386/jre

JAVA_HOME is the base location of java, where it can find the java executable $JAVA_HOME/bin/java

Regards,
Simon
On Thu, Jul 5, 2012 at 12:42 PM, Ying Huang <[EMAIL PROTECTED]> wrote:

> Hello,
>     I am installing hadoop according to this page:
> https://cwiki.apache.org/**BIGTOP/how-to-install-hadoop-**
> distribution-from-bigtop.html<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#
>
> ------------------------------**------------------------------**
> ------------------------------
>
>
> --
>
>
> Best Regards
> Ying Huang
>
>

Yes, you point out the root cause, after configuration,
this command
sudo -u hdfs hadoop namenode -format
  works.
Thank you.
On 07/05/2012 12:06 PM, Simon wrote:
> Did you configure JAVA_HOME in file hadoop-env.sh?
>
> Simon
>
>
> On Thu, Jul 5, 2012 at 1:02 PM, Ying Huang <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
>     According to your suggestion, I try following command, but still fail:
>     --------------------------------------------------------------------
>     root@ubuntu32:/usr/lib/hadoop# export
>     JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/jre
>
>     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
>     total 20
>     drwxr-xr-x 5 root root 4096 Jul  3 20:43 .
>     drwxr-xr-x 5 root root 4096 Jul  3 20:43 ..
>     lrwxrwxrwx 1 root root   50 May  2 20:14 ASSEMBLY_EXCEPTION ->
>     ../../java-7-openjdk-common/jre/ASSEMBLY_EXCEPTION
>     drwxr-xr-x 2 root root 4096 Jul  3 20:43 bin
>     drwxr-xr-x 8 root root 4096 Jul  3 20:43 lib
>     drwxr-xr-x 4 root root 4096 Jul  3 20:43 man
>     lrwxrwxrwx 1 root root   50 May  2 20:14 THIRD_PARTY_README ->
>     ../../java-7-openjdk-common/jre/THIRD_PARTY_README
>     root@ubuntu32:/usr/lib/hadoop#
>
>     --------------------------------------------------------------------
>
>     On 07/05/2012 11:53 AM, Simon wrote:
>>     I think you should set
>>     JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386/jre
>>
>>     JAVA_HOME is the base location of java, where it can find the
>>     java executable $JAVA_HOME/bin/java
>>
>>     Regards,
>>     Simon
>>
>>
>>     On Thu, Jul 5, 2012 at 12:42 PM, Ying Huang <[EMAIL PROTECTED]
>>     <mailto:[EMAIL PROTECTED]>> wrote:
>>
>>         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#
>>
>>         ------------------------------------------------------------------------------------------
>>
>>
>>         --
>>
>>
>>         Best Regards
>>         Ying Huang
>>
>>
>
>
>     --
>
>
>     Best Regards
>     Ying Huang
>
>
--
Best Regards
Ying Huang