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https://issues.apache.org/jira/browse/HADOOP-7956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179882#comment-13179882
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Robert Joseph Evans commented on HADOOP-7956:
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Suresh, deleting the version in the code could cause backwards compatibility
issues. CommonConfigurationKeysPublic.java is public not only in the java
since but also @InterfaceAudience.Public.
> Remove duplicate definition of default config values
> ----------------------------------------------------
>
> Key: HADOOP-7956
> URL: https://issues.apache.org/jira/browse/HADOOP-7956
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf
> Reporter: Eli Collins
>
> We define default configuration values in two places:
> #1 The default.xml files (eg core-default.xml)
> #2 The _DEFAULT defines in *Keys.java
> This means the defaults used in the code may or may not be dead code based on
> whether the config is present in the default xml file. Would be good to
> define these in one place. Eg:
> #1 Just have the defines in the code and figure out how to make those
> accessible as a loadable resource (eg could generate the default files from
> the defines in the KeysPublic* files)
> #2 Remove one of the definitions entirely (possible to live w/o the default
> files?) or
> #3 Remove the overlap between the code and default files
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