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https://issues.apache.org/jira/browse/HADOOP-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628481#action_12628481
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Doug Cutting commented on HADOOP-4042:
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This sounds reasonable and is what e.g., Ant's scripts do, so there's precedent.
> bin/hadoop should check `which java` to find java
> -------------------------------------------------
>
> Key: HADOOP-4042
> URL: https://issues.apache.org/jira/browse/HADOOP-4042
> Project: Hadoop Core
> 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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