Format command overwrites contents of non-empty shared edits dir if name dirs
are empty without any prompting
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Key: HDFS-3275
URL: https://issues.apache.org/jira/browse/HDFS-3275
Project: Hadoop HDFS
Issue Type: Bug
Components: ha, name-node
Affects Versions: 2.0.0
Reporter: Vinithra Varadharajan
To reproduce:
1) Configure a NameNode with namedirs and a shared edits dir, all of which are
empty.
2) Run hdfs namenode -format. Namedirs and shared edits dir gets populated.
2) Delete the contents of the namedirs. Leave the shared edits dir as is. Check
the timestamps of the shared edits dir contents.
3) Run format again. The namedirs as well as the shared edits dir get
formatted. The shared edits dir's contents have been replaced without any
prompting.
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