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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