[HADOOP-11393] Revert HADOOP_PREFIX, go back to HADOOP_HOME

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 3.0.0-alpha1
• Component/s: scripts, tracing
• Release Note: On Unix platforms, HADOOP_PREFIX has been deprecated in favor of returning to HADOOP_HOME as in prior Apache Hadoop releases.
• Flags: Important
• Assignee: Allen Wittenauer
• Reporter: Allen Wittenauer
• Created: 11/Dec/14 18:22
• Updated: 12/May/16 18:21
• Resolved: 31/Mar/16 14:55

Description

Today, Windows and parts of the Hadoop source code still use HADOOP_HOME. The switch to HADOOP_PREFIX back in 0.21 or so didn't really accomplish what it was intended to do and only helped confuse the situation.

_HOME is a much more standard suffix and is, in fact, used for everything in Hadoop except for the top level project home. I think it would be beneficial to use HADOOP_HOME in the shell code as the Official(tm) variable, still honoring HADOOP_PREFIX if it is set.

Issue Links

• relates to: HADOOP-11485 Pluggable shell integration
• supercedes: HADOOP-12456 Verify setting HADOOP_HOME explicitly works