Add utility method to initialize HDFS default configurations
------------------------------------------------------------
Key: HDFS-1932
URL: https://issues.apache.org/jira/browse/HDFS-1932
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Priority: Critical
Currently we have code blocks like the following in lots of places:
{code}
static{
Configuration.addDefaultResource("hdfs-default.xml");
Configuration.addDefaultResource("hdfs-site.xml");
}
{code}
This is dangerous since, if we don't remember to also classload
HdfsConfiguration, the config key deprecations won't work. We should add a
method like HdfsConfiguration.init() which would load the default resources as
well as ensure that deprecation gets initialized properly.
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