John Gordon created HADOOP-8874:
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Summary: HADOOP_HOME and -Dhadoop.home (from hadoop wrapper
script) are not uniformly handled
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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