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https://issues.apache.org/jira/browse/HADOOP-6948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908883#action_12908883
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Doug Cutting commented on HADOOP-6948:
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Is there an important use-case for removing properties?
> There's no way to remove a property from a Configuration
> --------------------------------------------------------
>
> Key: HADOOP-6948
> URL: https://issues.apache.org/jira/browse/HADOOP-6948
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf
> Affects Versions: 0.20.2, 0.21.0
> Environment: all
> Reporter: Mike Baranczak
> Priority: Minor
>
> The Configuration class has a lot of methods for setting properties, but it's
> impossible to remove a property once it's set. Trying to set it to null
> results in a NullPointerException, since java.util.Properties doesn't allow
> null values. When building a Configuration programmatically, this can be a
> problem.
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