CLONE -Herriot NN and DN clients should vend statistics
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Key: HDFS-1423
URL: https://issues.apache.org/jira/browse/HDFS-1423
Project: Hadoop HDFS
Issue Type: Improvement
Components: test
Affects Versions: 0.22.0
Reporter: Konstantin Boudnik
Assignee: Konstantin Boudnik
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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