[HADOOP-7374] Don't add tools.jar to the classpath when running Hadoop

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.23.0
• Component/s: scripts
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: The scripts that run Hadoop no longer automatically add tools.jar from the JDK to the classpath (if it is present). If your job depends on tools.jar in the JDK you will need to add this dependency in your job.
• Assignee: Eli Collins
• Reporter: Eli Collins
• Created: 09/Jun/11 21:56
• Updated: 15/Nov/11 00:50
• Resolved: 12/Jun/11 04:16

Description

bin/hadoop-config.sh (and bin/rcc) add lib/tools.jar from JAVA_HOME to the classpath. This has been there since the initial commit of bin/hadoop, but I don't think it's needed. Executing Hadoop does not depend on tools.jar (or other libraries only available in the JDK, not the JRE) so let's not automatically add it. Marking this as an incompatible change since a job could potentially have relied on Hadoop adding tools.jar to the CLASSPATH automatically (though such a job would not have run on a system that did not have JAVA_HOME point to a jdk). The build of course still requires a JDK.