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https://issues.apache.org/jira/browse/HADOOP-4631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653874#action_12653874
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Doug Cutting commented on HADOOP-4631:
--------------------------------------

Back-compatibility is a concern.  I think we should still always look for and 
load hadoop-site.xml but not hadoop-default.xml.  When we find and load 
hadoop-site.xml we should emit a warning.

> Split the default configurations into 3 parts
> ---------------------------------------------
>
>                 Key: HADOOP-4631
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4631
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: conf
>            Reporter: Owen O'Malley
>            Assignee: Sharad Agarwal
>             Fix For: 0.20.0
>
>         Attachments: 4631_v1.patch, 4631_v2.patch
>
>
> We need to split hadoop-default.xml into core-default.xml, hdfs-default.xml 
> and mapreduce-default.xml. That will enable us to split the project into 3 
> parts that have the defaults distributed with each component.

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