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https://issues.apache.org/jira/browse/HDFS-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123609#comment-13123609
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M. C. Srivas commented on HDFS-2413:
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This should be normal behavior part of all file-system ops. It is not
practical for a programmer to wrap all file access calls (eg, write, mkdir,
open) with "wait for NN to leave safemode".
> 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
> Fix For: 0.23.0
>
>
> 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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