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https://issues.apache.org/jira/browse/HADOOP-7814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13211306#comment-13211306
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Steve Loughran commented on HADOOP-7814:
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Thinking about this some more, my need is not just have a conf file built from
a properties file, but to get more of the system environment in during the
process -java home, various dirs, hostname, etc.
A way to do this -which wouldn't break anything shipping as property file
support is new- would be
# load property files/resources
# support ${variable} expansion in the properties
# resolve the preloaded properties from the std XML resources & files.
# support resolution of system properties (some prefix like sysprop.)
# support resolution of env variables (some prefix like env.)
This is more ambitious, and while trivial to do in groovy (built in $var
expansion with functions thrown in), needs more coding in Java;
perhaps some incremental approach is given where variable expansion is an
option, and in iteration 1 it isn't allowed.
The way to do this safely is not to try an expand the Configuration class. The
ultimate goal is "Create a configuration instance from one or more properties
files", not "have methods in Configuration to load properties from files".
Everything could be done alongside the existing class, with a new class to do
the construction and configuration of a new config instance.
> Add ability to add the contents of a properties file to Configuration
> ---------------------------------------------------------------------
>
> Key: HADOOP-7814
> URL: https://issues.apache.org/jira/browse/HADOOP-7814
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 1.0.0
> Reporter: Kristofer Tomasette
> Priority: Minor
> Attachments: HADOOP-7814.patch, HADOOP-7814.patch, HADOOP-7814.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> Add a method to Configuration that will take a location on the local
> filesystem of a properties file. Method should read in the file's properties
> and add them to the Configuration object.
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