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https://issues.apache.org/jira/browse/HDFS-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206616#comment-13206616
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Tsz Wo (Nicholas), SZE commented on HDFS-2413:
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> Patch that makes DFSAdmin carry two utility functions ...
It is not a good idea to change DFSAdmin to LimitedPrivate. The method
setSafeMode(String[] argv, int idx) is not really a good API for other projects
to use.
The method isInSafeMode() added in DistributedFileSystem is sufficient.
> Add public APIs for safemode
> ----------------------------
>
> Key: HDFS-2413
> URL: https://issues.apache.org/jira/browse/HDFS-2413
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs client
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Harsh J
> Attachments: HDFS-2413.patch, HDFS-2413.patch
>
>
> Currently the APIs for safe-mode are part of DistributedFileSystem, which is
> supposed to be a private interface. However, dependent software often wants
> to wait until the NN is out of safemode. Though it could poll trying to
> create a file and catching SafeModeException, we should consider making some
> of these APIs public.
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