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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-679) XML-based metrics as JSP servlet for JobTracker
Date Thu, 27 Aug 2009 02:38:59 GMT

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

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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