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https://issues.apache.org/jira/browse/HADOOP-6927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Al Thompson reopened HADOOP-6927:
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This work should be restricted to providing access DataNodeDescriptor in
Herriot's DNClient interface.
Certain metrics such as blocks-per-datanode are not yet supported in HDFS' JMX
MBeans.
> Herriot NN and DN clients should vend statistics
> ------------------------------------------------
>
> Key: HADOOP-6927
> URL: https://issues.apache.org/jira/browse/HADOOP-6927
> Project: Hadoop Common
> Issue Type: Improvement
> Components: test
> Reporter: Al Thompson
>
> The HDFS web user interface serves useful information through dfshealth.jsp
> and dfsnodelist.jsp.
> The Herriot interface to the namenode and datanode (as implemented in
> NNClient and DNClient, respectively) would benefit from the addition of some
> way to channel this information. In the case of DNClient this can be an
> injected method that returns a DatanodeDescriptor relevant to the underlying
> datanode.
> There seems to be no analagous NamenodeDescriptor. It may be useful to add
> this as a facade to a visitor that aggregates values across the filesystem
> datanodes. These values are (from dfshealth JSP):
> Configured Capacity
> DFS Used
> Non DFS Used
> DFS Remaining
> DFS Used%
> DFS Remaining%
> Live Nodes
> Dead Nodes
> Decommissioning Nodes
> Number of Under-Replicated Blocks
> Attributes reflecting the web user interface header may also be useful such
> as When-Started, Version, When-Compiled, and Upgrade-Status.
> A NamenodeDescriptor would essentially "push down" the code in dfshealth web
> UI behind a more general abstraction. If it is objectionable to make this
> class available in HDFS, perhaps this could be packaged in a Herriot specific
> way.
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