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From "Bharath Mundlapudi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-6605) Add JAVA_HOME detection to hadoop-config
Date Sat, 21 May 2011 18:46:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037435#comment-13037435
] 

Bharath Mundlapudi commented on HADOOP-6605:
--------------------------------------------

Most of the time, i do side-by-side jdk installations to see which jdk is better. Many times,
default jdk location is not preferred, Esp. as Allen mentioned sometimes /usr/bin/java isn't
Sun Java.

IMO, having .hadooprc file might be useful thing. Again, this file should be part of the bundle.
This is kind of creating virtual environment for hadoop installation. This will solve multiple
version problem also.  

Sometimes, it is hard to know which jdk binary hadoop is using, part of the reason is one
can set JAVA_HOME at multiple locations like shell, hadoop-env.sh etc Having consistent location
for setting this also helpful. One has to do ps cmd to figure out which location java is running
from.
 
Also, having a helper script like checkhadoopenv.sh should let the user know its current virtual
environment. This will be useful for debugging purpose.

I think, we should have one consistent way to set environment for hadoop this avoids user
confusion.

Main point: set all the environment variables required for hadoop in .hadooprc file defaulting
to certain values. User can edit this file depending on his/her case may be.

Defaulting env can be a tricky thing if user didn't set in .hadooprc. If this happens, we
should let user know that he/she should update .hadooprc file for the missing env variables.

This file (.hadooprc) is user editable. We should document and make it the only place users
can tinker their environment. This avoids most of the confusion. Do you agree?




> Add JAVA_HOME detection to hadoop-config
> ----------------------------------------
>
>                 Key: HADOOP-6605
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6605
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Chad Metcalf
>            Assignee: Eli Collins
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: HADOOP-6605.patch, hadoop-6605-1.patch, hadoop-6605-2.patch
>
>
> The commands that source hadoop-config.sh currently bail with an error if JAVA_HOME is
not set. Let's detect JAVA_HOME (from a list of locations on various OS types) if JAVA_HOME
is not already set by hadoop-env.sh or the environment. This way users don't have to manually
configure it.

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