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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-679) XML-based metrics as JSP servlet for JobTracker
Date Mon, 24 Aug 2009 13:26:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12746861#action_12746861
] 

Steve Loughran commented on MAPREDUCE-679:
------------------------------------------

TldLocations cache is some cache for globally defined taglibs 

http://tomcat.apache.org/tomcat-5.5-doc/jasper/docs/api/org/apache/jasper/compiler/TldLocationsCache.html

source is here:
http://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk/java/org/apache/jasper/compiler/TldLocationsCache.java

Looking at the source, the message comes from {{{processWebDotXml()}}}; it doesnt do any harm,
except that it doesnt bother parsing any web.xml -defined content if web.xml is nowhere to
be found. Its a warning, not an error. 

There is a servlet context property, org.apache.catalina.deploy.alt_dd, which can be used
to identify an alternate deployment descriptor, but I have no idea how to set that from command
line jspc.

Recommendation: ignore the warning.

> 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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