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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-679) XML-based metrics as JSP servlet for JobTracker
Date Tue, 22 Sep 2009 10:33:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758199#action_12758199
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Vinod K V commented on MAPREDUCE-679:
-------------------------------------

I really like the fact that something real is finally done with respect to testing information
presented via JSPs. Thanks Aaron!

But I still have one doubt - how do we keep the jsp and jspx pages in sync? I can think of
ways in which we take the XML output as the standard and generate html from it (ala forrest).
I can already see this kind of duplication across html/xml in this patch, generateRetiredJobTable()
and generateRetiredJobXml() in JSPUtil.java for example. Thoughts about this?

> 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
>             Fix For: 0.21.0
>
>         Attachments: example-jobtracker-completed-job.xml, example-jobtracker-running-job.xml,
MAPREDUCE-679.2.patch, MAPREDUCE-679.3.patch, MAPREDUCE-679.4.patch, MAPREDUCE-679.5.patch,
MAPREDUCE-679.6.patch, MAPREDUCE-679.7.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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