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https://issues.apache.org/jira/browse/HADOOP-9562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665631#comment-13665631
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Trevor Lorimer commented on HADOOP-9562:
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Hi, Thanks Philip about 75% of the information can be obtained from JMX.
I only need to make these additions to pre-existing JMX interfaces (I will link
this to a new JIRA):
Started time,
Compiled info,
Jvm MaxHeap, MaxNonHeap
Node Usage stats (i.e. Min, Median, Max, stdev),
Number of decommissioned Live and Dead nodes,
Journal Status
The only information I have had difficulty obtaining is the status header (e.g.
NameNode 'localhost:8020' (active)). This information is contained within the
NameNode object which does not seem to be exposed through JMX and cannot be
referenced from FSNamesystem.
> 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
> Attachments: 0001-HAD-162-Final-revision-refactor.patch
>
>
> 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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