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https://issues.apache.org/jira/browse/MAPREDUCE-679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron Kimball updated MAPREDUCE-679:
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Attachment: MAPREDUCE-679.5.patch
As you note, this API exposes nothing that's not already part of
jobtracker.jsp. I don't see this as a fundamentally new API, just a new
presentation layer for existing data. The same exact hooks are used in both.
I'm attaching a new patch with a thread-safe call to getRunningJobs() instead
of runningJobs(). I changed jobtracker.jsp to do the same; also added
getCompletedJobs() and getFailedJobs() that use the same synchronzation
discipline as getRunningJobs(). Finally, I added a "retired jobs" section that
conforms to the API of MAPREDUCE-870.
Tested all of this locally by running jobs and checking the output XML for
validation.
> 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-679.4.patch, MAPREDUCE-679.5.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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