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https://issues.apache.org/jira/browse/HADOOP-7077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974674#action_12974674
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Tom White commented on HADOOP-7077:
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To do this we would add an interface called ConfigurationResourceLoader or
somesuch with a single loadResources() method. The static initializer in
Configuration would use ServiceLoader to load the implementations of
ConfigurationResourceLoader and call loadResources() on each of them. Then in
HDFS we would have an implementation of ConfigurationResourceLoader that adds
hdfs-default.xml and hdfs-site.xml. (And similarly for MapReduce.)
> Use Java's ServiceLoader to add default resources to Configuration
> ------------------------------------------------------------------
>
> Key: HADOOP-7077
> URL: https://issues.apache.org/jira/browse/HADOOP-7077
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf
> Reporter: Tom White
>
> Currently each class with a main() method (in HDFS and MapReduce) calls
> Configuration.addDefaultResource() to add the names of resource files to load
> (e.g. see DataNode and NameNode which both add hdfs-default.xml and
> hdfs-site.xml). We could reduce the code duplication by allowing the use of
> [java.util.ServiceLoader|http://download.oracle.com/javase/6/docs/api/java/util/ServiceLoader.html]
> to do the initialization.
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