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Date: Wed, 18 May 2011 20:42:47 +0000 (UTC)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-6605) Add JAVA_HOME detection to
 hadoop-config
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    [ https://issues.apache.org/jira/browse/HADOOP-6605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035654#comment-13035654 ] 

Allen Wittenauer commented on HADOOP-6605:
------------------------------------------

java_home is not a stable interface.  It cannot be trusted to last, especially given the question marks that hang over Java on OS X.

I'm -1 for a variety of reasons:

a) we're getting into platform specific code without a good reason
b) this could have significant performance ramifications as we add more and more paths to support more and more OSes
c) there is a config option to specifically eliminate the need to do this

> 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
>
>
> 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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