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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-215) New method for obtaining report of NameNode and JobTracker internals
Date Mon, 19 Jun 2006 21:24:30 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-215?page=all ]
     
Owen O'Malley resolved HADOOP-215:
----------------------------------

    Resolution: Won't Fix

Alan asked to close this.

> New method for obtaining report of NameNode and JobTracker internals
> --------------------------------------------------------------------
>
>          Key: HADOOP-215
>          URL: http://issues.apache.org/jira/browse/HADOOP-215
>      Project: Hadoop
>         Type: New Feature

>   Components: mapred, dfs
>     Reporter: alan wootton
>     Priority: Minor

>
> Many weeks ago we (at shopping.com research) decided we wanted to be able to get reports
from the internals of JobTracker and NameNode. The hadoop web server provides some of this,
but we wanted a more structured output, and easier extensibility.
> So, we decided to use xml, and I wrote it.
> There is a very thin interface to ClientProtocol, and JobSubmissionProtocol like this:
> public XmlReporter getXmlReport(String classname, String question);
> The implementation (in JobTracker and NameNode ) looks like this:
> public XmlReporter getXmlReport(String classname, String question)
>     {
> 		XmlReporter reporter = XmlReporter.getInstance( classname, this,  question);
> 		reporter.report();
> 		return reporter;
>     }
> The idea being that you pass in some xml (question), an XmlReporter (classname) is instanciated
and passed back. 
> An XmlReporter object consists of nothing more that two org.w3c.dom.Document objects
(one in the question, the other is the answer). The Writable interface, for the RPC, simply
serializes the dom tree to a string, and then parses it back to a dom tree.
> Anyway, here it is. I would like for it to either make it into the code, or for me to
find anoher way. 

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