Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2548
That's a good point @greghogan. We don't have a standard way to print a
usage message. A disadvantage of the approach in this PR is that we will
display an error message which might actually mask any usage information
printed. An alternative approach would be to simply exit (perhaps with a small
hint). That might actually be nicer.
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