Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3406
Hi @KurtYoung, you are right. Only `requiredProperties()` would be required
to verify properties.
I thought that the other two methods would be a good way to define the
parameters of the converter. They could be used to print a usage message or
details when the properties are not matched. We can also leave those out if you
think that the implementation overhead does not correspond to the gains.
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