If dfs.name.dir points to an empty dir, namenode format shouldn't require
confirmation
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Key: HDFS-1636
URL: https://issues.apache.org/jira/browse/HDFS-1636
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.23.0
Reporter: Todd Lipcon
Priority: Minor
Right now, running namenode -format when dfs.name.dir is configured to a dir
which exists but is empty still asks for confirmation. This is unnecessary
since it isn't blowing away any real data.
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