DataNode started with illegal startup options should print usage and stop
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Key: HADOOP-995
URL: https://issues.apache.org/jira/browse/HADOOP-995
Project: Hadoop
Issue Type: Bug
Reporter: Konstantin Shvachko
Now that we have data-node startup options we should enforce them and not start
the data-node when the options are illegal.
Currently the data-node just ignores illegal option.
If I start my data-node with --rack option without the argument the data-node
prints the usage and starts anyway.
If I provide an unspecified option, say -xxx, then even the usage message is
not printed.
I see an inconsistency here between the usage information and the data-node
behavior.
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