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https://issues.apache.org/jira/browse/HDFS-453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12726545#action_12726545
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Steve Loughran commented on HDFS-453:
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The NN JSP helper is chucking out HTML from some of its methods, not
well-formed XML. There's a risk that the content pushed out here is not valid
XML.
#the tests that have been left out need to take the XML and try and parse it.
This isn't that hard, you could do it in Ant using <get> then <xmlvalidate>,
ideally against a schema that comes with the patch.
#All content that goes out as XML has to be passed through XMLenc. I actually
think this is a good opportunity to knock up a successor to xmlenc, one that is
namespace aware, and so can be used to push XHTML in the right namespace.
> XML-based metrics as JSP servlet for NameNode
> ----------------------------------------------
>
> Key: HDFS-453
> URL: https://issues.apache.org/jira/browse/HDFS-453
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Attachments: HDFS-453.patch
>
>
> In HADOOP-4559, a general REST API for reporting metrics was proposed but
> work seems to have stalled. In the interim, we have a simple XML translation
> of the existing NameNode status page which provides the same metrics as the
> human-readable page. This is a relatively lightweight addition to provide
> some machine-understandable metrics reporting.
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