Re: [DISCUSS] KIP-641 An new java interface to replace 'kafka.common.MessageReader'

[Chia-Ping Tsai]

> 3. On the matter of configure(): While it doesn't add any functionality, it
> would be more consistent with other plugins if this interface extended
> Configurable, and the InputStream was then passed via some other method
> (`readFrom(InputStream)` perhaps). If nothing else it would make it harder
> to overlook this interface when making changes which apply to all plugins.
> To be honest, I'm not entirely convinced myself, but I thought we should at
> least consider it and add it to the rejected alternatives if we decide
> against it.

Make sense. How about moving the `InputStream` from `configure` to 
`readRecord`? By that change, the `RecordReader` can be a subinterface of 
`Configurable`.