Github user brkyvz commented on the issue:
https://github.com/apache/spark/pull/17250
Good point @budde. I can think of two options:
1. Leave it as a constructor param
2. Make the `Builder` class non-generic and have the `build` function take
the message handler:
```scala
class Builder {
def build(): KinesisInputDStream[Array[Byte]]
def buildWithMessageHandler[T](f: Record => T): KinesisInputDStream[T]
}
```
It's a matter of taking it as the first parameter or the final parameter.
There are other ways to do it as well, but will throw runtime exceptions
instead of at compile time.
cc @rxin for input on APIs
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