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https://issues.apache.org/jira/browse/HADOOP-10446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13950537#comment-13950537
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Steve Loughran commented on HADOOP-10446:
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If there's something you MUST address it is references in the objects
{{${something}}} -used a lot and not something you can ignore
# I don't think its strictly defined yet
# from the code it is: attempt local, then the base resources
# and finally java system properties
# I don't know about transitive reference and if, when and how recursion &
loops are detected.
Equally interesting is "when does this take place?", the answer being "when
someone calls getXXX()". You have to leave the values unresolved when you
serialize a config & send it over the wire to the far end; only your bit of the
config is forwarded, the far end resolves values using its base resources and
system properties.
> native code for reading Hadoop configuration XML files
> ------------------------------------------------------
>
> Key: HADOOP-10446
> URL: https://issues.apache.org/jira/browse/HADOOP-10446
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Colin Patrick McCabe
>
> We need to have a way to read Hadoop configuration XML files in the native
> HDFS and YARN clients. This will allow those clients to discover the
> locations of NameNodes, YARN daemons, and other configuration settings, etc.
> etc.
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