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https://issues.apache.org/jira/browse/HADOOP-8524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398835#comment-13398835
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Robert Joseph Evans commented on HADOOP-8524:
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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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