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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-6605) Add JAVA_HOME detection to hadoop-config
Date Wed, 18 May 2011 19:26:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035606#comment-13035606
] 

Eli Collins commented on HADOOP-6605:
-------------------------------------

bq. Why this shouldn't be in a one-time setup script rather than executed on every hadoop
invocation?

Because the java installation may change between invocations, eg you may eg install java between
invocations of the hadoop command, or you may remove one java installation and then install
a new one and you don't want the old one (which is no longer present) cached anywhere. Eg

# exec hadoop  # fails due to lack of java
# yum install java-xyz
# exec hadoop  # now picks up java

This detection only kicks in if JAVA_HOME is not explicitly set elsewhere, if you want to
always use a particular version of java, just set JAVA_HOME.

Any remaining technical objection?

> 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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