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https://issues.apache.org/jira/browse/HADOOP-7851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156984#comment-13156984
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Amar Kamat commented on HADOOP-7851:
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Not setting a value for a configuration parameter is different from setting it
to "". Hence when the parameter is not set, the default value should be
returned. When the parameter is set (including "") then the specified value
should be returned and not the default. Hence a simple check before invoking
getTrimmedStrings() should suffice.
> Configuration.getClasses() never returns the default value.
> -----------------------------------------------------------
>
> Key: HADOOP-7851
> URL: https://issues.apache.org/jira/browse/HADOOP-7851
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Affects Versions: 0.23.0
> Reporter: Amar Kamat
> Assignee: Uma Maheswara Rao G
> Labels: configuration
> Fix For: 0.24.0, 0.23.1
>
> Attachments: HADOOP-7851.patch, HADOOP-7851.patch
>
>
> Configuration.getClasses() never returns the default value.
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