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https://issues.apache.org/jira/browse/HADOOP-3479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604809#action_12604809
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Steve Loughran commented on HADOOP-3479:
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As someone whose product does configuration and deployment, this is somehting
that I do feel strongly about.
While I like hierarchical representations, I dont think XPath should be used
unless everyone understand the consequences. For example, what happens if more
than one thing comes back? What happens if someone plays xml namespace games. I
have tried to use XPath based configuration schemas and it soon gets complex.
What if I want to do property expansion in the Path, like
/configuration/queues/[EMAIL PROTECTED]"${user.name}"] ? what if I set a path
that exists -is that an append or an overwrite?
Equally importantly, it forces a requirement for the XML DOM to be the only
representation of content. That is a tree, not a graph, and not that agile. If
you were to use LDAP or anything else then things wouldnt work.
So . I'm:
+1 for a consistent way of configuring things.
+1 for hierarchical representation of information.
+1 for decoupling the configuration source from the Configuration class, so
that any provider of a hierarchical configuration name-value pairs can return
values on name lookups.
-1 for XPath
> Implement configuration items useful for Hadoop resource manager (v1)
> ---------------------------------------------------------------------
>
> Key: HADOOP-3479
> URL: https://issues.apache.org/jira/browse/HADOOP-3479
> Project: Hadoop Core
> Issue Type: New Feature
> Reporter: Hemanth Yamijala
> Assignee: Hemanth Yamijala
> Attachments: 3479.patch
>
>
> HADOOP-3421 lists requirements for a new resource manager for Hadoop.
> Implementation for these will require support for new configuration items in
> Hadoop. This JIRA is to define such configuration, and track it's
> implementation.
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