Christopher Tubbs created HADOOP-12118:
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             Summary: Validate xml configuration files with XML Schema
                 Key: HADOOP-12118
                 URL: https://issues.apache.org/jira/browse/HADOOP-12118
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Christopher Tubbs


I spent an embarrassingly long time today trying to figure out why the 
following wouldn't work.

{code}
<property>
  <key>fs.defaultFS</key>
  <value>hdfs://localhost:9000</value>
</property>
{code}

I just kept getting an error about no authority for {{fs.defaultFS}}, with a 
value of {{file:///}}, which made no sense... because I knew it was there.

The problem was that the {{core-site.xml}} was parsed entirely without any 
validation. This seems incorrect. The very least that could be done is a simple 
XML Schema validation against an XSD, before parsing. That way, users will get 
immediate failures on common typos and other problems in the xml configuration 
files.



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