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https://issues.apache.org/jira/browse/HADOOP-9562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660325#comment-13660325
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Steve Loughran commented on HADOOP-9562:
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Well, it's clearly not a bug, which makes it a feature of some form, to go into
trunk and then backported with the blessing/acquiescence of the release
manager. I'm happy to help review and vote on this, if you are happy to deal
with the inconsistencies of adding features to what you declared to be a
feature-frozen release.
I've proposed a section on Web UI compatibility to the [compatibility
definitions|https://issues.apache.org/jira/browse/HADOOP-9517?focusedCommentId=13660321&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13660321],
this argues in favour of a a machine-parseable format from the outset.
It could still be XML with an XSL for the browser to auto-convert into
human-readable content; I know JSON is the format du-jour, but XML tooling is
built into Java (and iphone, android, etc), and it is actually more tightly
specified than JSON, which has some gaping holes in its spec (what happens if
you have duplicate keys, for example).
> Create REST interface for HDFS health data
> ------------------------------------------
>
> Key: HADOOP-9562
> URL: https://issues.apache.org/jira/browse/HADOOP-9562
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Affects Versions: 2.0.4-alpha
> Reporter: Trevor Lorimer
> Priority: Minor
>
> The HDFS health screen (dfshealth.jsp) displays basic Version, Security and
> Health information concerning the NameNode, currently this information is
> accessible from classes in the org.apache.hadoop,hdfs.server.namenode package
> and cannot be accessed outside the NameNode. This becomes prevalent if the
> data is required to be displayed using a new user interface.
> The proposal is to create a REST interface to expose all the information
> displayed on dfshealth.jsp using GET methods. Wrapper classes will be created
> to serve the data to the REST root resource within the hadoop-hdfs project.
> This will enable the HDFS health screen information to be accessed remotely.
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