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From "John Gordon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8874) HADOOP_HOME and -Dhadoop.home (from hadoop wrapper script) are not uniformly handled
Date Wed, 03 Oct 2012 04:04:07 GMT
John Gordon created HADOOP-8874:

             Summary: HADOOP_HOME and -Dhadoop.home (from hadoop wrapper script) are not uniformly
                 Key: HADOOP-8874
                 URL: https://issues.apache.org/jira/browse/HADOOP-8874
             Project: Hadoop Common
          Issue Type: Bug
          Components: scripts, security
    Affects Versions: 1-win
         Environment: Called from external process with -D flag vs HADOOP_HOME set.
            Reporter: John Gordon
             Fix For: 1-win

There is a -D flag to set hadoop.home, which is specified in the hadoop wrapper scripts. 
This is particularly useful if you want SxS execution of two or more versions of hadoop (e.g.
rolling upgrade).  However, it isn't honored at all.  HADOOP_HOME is used in 3-4 places to
find non-java hadoop components such as schedulers, scripts, shared libraries, or with the
Windows changes -- binaries.

Ideally, these should all resolve the path in a consistent manner, and callers shuold have
a similar onus applied when trying to resolve an invalid path to their components.  This is
particularly relevant to scripts or binaries that may have security impact, as absolute path
resolution is generally safer and more stable than relative path resolution.

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