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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-6605) Add JAVA_HOME detection to hadoop-config
Date Thu, 19 May 2011 14:15:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036202#comment-13036202
] 

Daryn Sharp commented on HADOOP-6605:
-------------------------------------

Love it.  Comments:

SunOS - why not jdk1.6.* to get latest patch version, or jdk*.*?  Using the last item in the
glob expansion or search in reverse order should generally get the latest version.

Linux - Same as SunOS.  Also, why aren't /usr/java/default and /usr/lib/jvm/default-java checked
first?

Overall, maybe globs aren't a great idea since it may lead to a lot more paths being added
which I think is Eli's concern.  Would it make more sense to only support using the "standard"
mechanisms of an OS if that OS provides one?  In which case the functionality is to make hadoop
a good citizen of that OS, and not to make pseudo-intelligent guesses?

> 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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