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https://issues.apache.org/jira/browse/MAPREDUCE-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747902#action_12747902
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Steve Loughran commented on MAPREDUCE-679:
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I actually quite like XML interfaces you can GET as a way of seeing what's
going on
* people can read them
* you can directly import them into any spreadsheet that can GET+Xpath a
document, including google spreadsheets (if you were to expose your cluster to
the world)
* code can get then XSLT them into useful forms
* if the error code is meaningful, you can have routers keep an eye on them.
For that to work, you need the ability to set limits in the report (eg. have a
query param that specifies the minimum #of nodes you want for the cluster to be
considered functional)
And, unlike every other JSP page in the codebase, it has a test. This will
reduce maintenance costs, as future patches are less likely to break things.
> 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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