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https://issues.apache.org/jira/browse/HADOOP-6605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036480#comment-13036480
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Eli Collins commented on HADOOP-6605:
-------------------------------------
bq. FYI: I'm not removing my -1 as long as this remains in the main hadoop bin
code path.
Allen - what is your technical objection? There is not a performance impact to
hadoop-config.sh, and even if there were, hadoop-config.sh is not a measurable
part of hadoop command execution.
{noformat}
common1 (trunk)$ export JAVA_HOME=/home/eli/toolchain/jdk1.6.0_24-x64
common1 (trunk)$ time for i in {1..10}; do . bin/hadoop-config.sh ; done
real 0m0.817s
user 0m0.500s
sys 0m0.120s
common1 (trunk)$ unset JAVA_HOME
common1 (trunk)$ time for i in {1..10}; do . bin/hadoop-config.sh ; done
real 0m0.806s
user 0m0.550s
sys 0m0.060s
{noformat}
> 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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