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https://issues.apache.org/jira/browse/HADOOP-9562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660955#comment-13660955
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Steve Loughran commented on HADOOP-9562:
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OK. I'd like safe mode in there, and the ability to generate a HTTP error if
any value doesn't match expected. I'm not sure {{header}} is the right name,
but that's a detail
{{hdfs/v1/status?format=json&state="active"}} returns 200 & the result listed,
but {{hdfs/v1/status?format=json&state="offline"}} returns 500+ JSON.
This makes liveness/config probes from curl trivial -you can omit the JSON
parse stage
> 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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