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From "Konstantin Boudnik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1408) Herriot NN and DN clients should vend statistics
Date Thu, 11 Nov 2010 19:05:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931138#action_12931138
] 

Konstantin Boudnik commented on HDFS-1408:
------------------------------------------

I have ran test-patch manually - below - and see the same 97 audit warnings as Todd got for
his latest patch.

Apparently, test-patch is having issues again. I'm going to commit this patch.

{format}
-1 overall.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 9 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    -1 release audit.  The applied patch generated 97 release audit warnings (more than the
trunk's current 1 warnings).

    +1 system test framework.  The patch passed system test framework compile.
{format}


> Herriot NN and DN clients should vend statistics
> ------------------------------------------------
>
>                 Key: HDFS-1408
>                 URL: https://issues.apache.org/jira/browse/HDFS-1408
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: test
>    Affects Versions: 0.22.0
>            Reporter: Al Thompson
>            Assignee: Konstantin Boudnik
>         Attachments: add_JMXlisteners.patch, HADOOP-6927.y20s.patch, HDFS-1408.patch,
HDFS-1408.patch, HDFS-1408.patch, HDFS-1408.patch, jmx.patch, jmx.patch, jmx.patch, jmx.patch
>
>
> 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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