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https://issues.apache.org/jira/browse/HADOOP-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935344#action_12935344
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Wojciech Langiewicz commented on HADOOP-4042:
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I don't know how this would affect performance issues, but on my system 'which
java' shows /usr/bin/java, which is a symlink to /etc/alternatives/java, which
is a symlink to /usr/lib/jvm/java-6-openjdk/jre/bin/java.
and $JAVA_HOME points directly to /usr/lib/jvm/java-6-openjdk
> bin/hadoop should check `which java` to find java
> -------------------------------------------------
>
> Key: HADOOP-4042
> URL: https://issues.apache.org/jira/browse/HADOOP-4042
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Affects Versions: 0.18.0
> Reporter: Michael Bieniosek
> Priority: Minor
>
> Currently, the bin/hadoop script tries to find java in JAVA_HOME/bin/java.
> If JAVA_HOME is not set, it errors out.
> Instead, I think it should check `which java 2>/dev/null` to see if there is
> a java on the user's PATH. If a java is on the user's path, the script
> should just set JAVA=java.
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