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https://issues.apache.org/jira/browse/MAPREDUCE-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748241#action_12748241
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Aaron Kimball commented on MAPREDUCE-679:
-----------------------------------------

We have clients who want to integrate some basic jobtracker/namenode monitoring 
and jobtracker history into external metrics-tracking applications. Scraping 
the HTML off the existing JSP's doesn't cut it -- XML representations of them 
are considerably more sane. Earlier versions of this patch are already in 
one-off deployments.

As for the "interim" nature of this -- Really, I think the interim is here to 
stay. HADOOP-4559 has not had any attention since early February, and that was 
just a one-off comment. No substantive dialogue there since Dec '08.


> XML-based metrics as JSP servlet for JobTracker
> -----------------------------------------------
>
>                 Key: MAPREDUCE-679
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-679
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: jobtracker
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>         Attachments: example-jobtracker-completed-job.xml, 
> example-jobtracker-running-job.xml, MAPREDUCE-679.2.patch, 
> MAPREDUCE-679.3.patch, MAPREDUCE-679.patch
>
>
> In HADOOP-4559, a general REST API for reporting metrics was proposed but 
> work seems to have stalled. In the interim, we have a simple XML translation 
> of the existing JobTracker status page which provides the same metrics 
> (including the tables of running/completed/failed jobs) as the human-readable 
> page. This is a relatively lightweight addition to provide some 
> machine-understandable metrics reporting.

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