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https://issues.apache.org/jira/browse/HADOOP-2385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12551883
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Doug Cutting commented on HADOOP-2385:
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> I'd prefer if we had a separate configuration class for each component, say
> NamenodeConfiguration, DatanodeConfiguration, ...
This can be a problem when a configuration is passed between components. For
example, if we had an FsConfiguration, RpcConfiguration, etc., then calls from,
e.g., mapred code to these would require the creation of a new configuration.
So this only works well for top-level components, when all calls from a
component are to components that are configured by Configuration. But it can
be hard to know when something is top-level, e.g., we'd like to be able to run
datanode within other daemons.
> That reminds me about one abandoned issue HADOOP-24 - an attempt to make a
> configuration interface.
Hmm. It looks like I dropped the ball on that one! It's not back-compatible,
since any code that calls 'new Configuration()' would break, and it's missing
some javadoc, etc. But it might still be a nice change, although I don't see
how it would help us here.
> We should also use xml schema for the verification purposes.
I don't see how that would do sufficient type checking any more easily. Do you?
> Validate configuration parameters
> ---------------------------------
>
> Key: HADOOP-2385
> URL: https://issues.apache.org/jira/browse/HADOOP-2385
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.16.0
> Reporter: Robert Chansler
>
> Configuration parameters should be fully validated before name nodes or data
> nodes begin service.
> Required parameters must be present.
> Required and optional parameters must have values of proper type and range.
> Undefined parameters must not be present.
> (I was recently observing some confusion whose root cause was a mis-spelled
> parameter.)
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