Name Node should not process format command while it is running.
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Key: HDFS-1690
URL: https://issues.apache.org/jira/browse/HDFS-1690
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.21.0, 0.20.2, 0.20.1
Reporter: Uma Maheswara Rao G
Currently NameNode allows format command while it running. In this case the
command is executed partially (Lock file is deleted) and an exception thrown.
Because of this Name Node should be formatted after restart. This sort of cases
can happen accidentally. To prevent such cases Name Node should not execute the
format command partially while it is running. It can stright away throw
exception/log saying, Name Node is running.
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