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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8524) Allow users to get source of a Configuration parameter
Date Thu, 21 Jun 2012 20:45:42 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398835#comment-13398835
] 

Robert Joseph Evans commented on HADOOP-8524:
---------------------------------------------

Great I just filed HADOOP-8525 for this.  If you want to work on it go right ahead, if not
I will try to throw together a quick patch sometime this week.

and +1 for this patch.  Looks good to me.
                
> Allow users to get source of a Configuration parameter
> ------------------------------------------------------
>
>                 Key: HADOOP-8524
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8524
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 2.0.0-alpha
>            Reporter: Harsh J
>            Assignee: Harsh J
>            Priority: Trivial
>         Attachments: HADOOP-8524.patch, HADOOP-8524.patch, HADOOP-8524.patch
>
>
> When we load the various XMLs via the Configuration class, the source of the XML file
(filename) is usually kept in the Configuration class but not exposed programmatically. It
is presently exposed as comments such as "Loaded from mapred-site.xml" in the XML dump/serialization
but can't be accessed otherwise (Via the Configuration API).
> For debugging/etc. purposes, it may be useful to expose this safely (such as an API for
"where did this property come from?" queries for a specific property, via an API.

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