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https://issues.apache.org/jira/browse/HDFS-6418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14005555#comment-14005555
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Suresh Srinivas commented on HDFS-6418:
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I agree with [~brandonli], we should not be using private classes in external
projects. Either we should make the class interface audience public or define
constants locally in the project.
> Regression: DFS_NAMENODE_USER_NAME_KEY missing in trunk
> -------------------------------------------------------
>
> Key: HDFS-6418
> URL: https://issues.apache.org/jira/browse/HDFS-6418
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 3.0.0, 2.5.0
> Reporter: Steve Loughran
>
> Code i have that compiles against HADOOP 2.4 doesn't build against trunk as
> someone took away {{DFSConfigKeys.DFS_NAMENODE_USER_NAME_KEY}} -apparently in
> HDFS-6181.
> I know the name was obsolete, but anyone who has compiled code using that
> reference -rather than cutting and pasting in the string- is going to find
> their code doesn't work.
> More subtly: that will lead to a link exception trying to run that code on a
> 2.5+ cluster.
> This is a regression: the old names need to go back in, even if they refer to
> the new names and are marked as deprecated
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