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List:       hadoop-dev
Subject:    [jira] Resolved: (HADOOP-6927) Herriot NN and DN clients should
From:       "Al Thompson (JIRA)" <jira () apache ! org>
Date:       2010-08-26 17:09:54
Message-ID: 16623660.8391282842594192.JavaMail.jira () thor
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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 resolved HADOOP-6927.
---------------------------------

    Resolution: Invalid

Best to use HDFS JMX support for gathering this info.

> 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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